PinoyBIX Engineering Problem Solving and Reference

This is the Multiple Choice Questions in Chapter 24: Regulated Power Supplies from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Supply Characteristics
• MCQs in Shunt Regulators
• MCQs in Series Regulators
• MCQs in Monolithic Linear Regulators
• MCQs in Current Boosters
• MCQs in DC-to-DC Converters
• MCQs in Switching Regulators

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Voltage regulators normally use

• a. Negative feedback
• b. Positive feedback
• c. No feedback
• d. Phase limiting

2. During regulation, the power dissipation of the pass transistor equals the collector-emitter voltage times the

• a. Base current
• b. Load current
• c. Zener current
• d. Foldback current

3. Without current limiting, a shorted load will probably

• a. Produce zero load current
• b. Destroy diodes and transistors
• c. Have a load voltage equal to the zener voltage
• d. Have too little load current

4. A current-sensing resistor is usually

• a. Zero
• b. Small
• c. Large
• d. Open

5. Simple current limiting produces too much heat in the

• a. Zener diode
• b. Load resistor
• c. Pass transistor
• d. Ambient air

6. With foldback current limiting, the load voltage approaches zero, and the load current approaches

• a. A small value
• b. Infinity
• c. The zener current
• d. A destructive level

7. A capacitor may be needed in a discrete voltage regulator to prevent

• a. Negative feedback
• b. Excessive load current
• c. Oscillations
• d. Current sensing

8. If the output of a voltage regulator varies from 15 to 14.7 V between the minimum and maximum load current, the load regulation is

• a. 0
• b. 1%
• c. 2%
• d. 5%

9. If the output of a voltage regulator varies from 20 to 19.8 V when the line voltage varies over its specified range, the source regulation is

• a. 0
• b. 1%
• c. 2%
• d. 5%

10. The output impedance of a voltage regulator is

• a. Very small
• b. Very large
• c. Equal to the load voltage divided by the load current
• d. Equal to the input voltage divided by the output current

11. Compared to the ripple into a voltage regulator, the ripple out of a voltage regulator is

• a. Equal in value
• b. Much larger
• c. Much smaller
• d. Impossible to determine

12. A voltage regulator has a ripple rejection of -60 dB. If the input ripple is 1 V, the output ripple is

• a. -60 mV
• b. 1 mV
• c. 10 mV
• d. 1000 V

13. Thermal shutdown occurs in an IC regulator if

• a. Power dissipation is too high
• b. Internal temperature is too high
• c. Current through the device is too high
• d. All the above occur

14. If a linear three-terminal IC regulator is more than a few inches from the filter capacitor, you may get oscillations inside the IC unless you use

• a. Current limiting
• b. A bypass capacitor on the input pin
• c. A coupling capacitor on the output pin
• d. A regulated input voltage

15. The 78XX series of voltage regulators produces an output voltage that is

• a. Positive
• b. Negative
• c. Either positive or negative
• d. Unregulated

16. The 78XX-12 produces a regulated output voltage of

• a. 3 V
• b. 4 V
• c. 12 V
• d. 40 V

17. A current booster is a transistor in

• a. Series with the IC regulator
• b. Parallel with the IC regulator
• c. Either series or parallel
• d. Shunt with the load

18. To turn on a current booster, we can drive its base-emitter terminals with the voltage across

• a. A load resistor
• b. A zener impedance
• c. Another transistor
• d. A current-sensing resistor

19. A phase splitter produces two output voltages that are

• a. Equal in phase
• b. Unequal in amplitude
• c. Opposite in phase
• d. Very small

20. A series regulator is an example of a

• a. Linear regulator
• b. Switching regulator
• c. Shunt regulator
• d. Dc-to-dc converter

21. To get more output voltage from a buck switching regulator, you have to

• a. Decrease the duty cycle
• b. Decrease the input voltage
• c. Increase the duty cycle
• d. Increase the switching frequency

22. An increase of line voltage into a power supply usually produces

• a. A decrease in load resistance
• b. An increase in load voltage
• c. A decrease in efficiency
• d. Less power dissipation in the rectifier diodes

23. A power supply with low output impedance has low

• a. Load regulation
• b. Current limiting
• c. Line regulation
• d. Efficiency

24. A zener-diode regulator is a

• a. Shunt regulator
• b. Series regulator
• c. Switching regulator
• d. Zener follower

25. The input current to a shunt regulator is

• a. Variable
• b. Constant
• c. Equal to load current
• d. Used to store energy in a magnetic field

26. An advantage of shunt regulation is

• a. Built-in short-circuit protection
• b. Low power dissipation in the pass transistor
• c. High efficiency
• d. Little wasted power

27. The efficiency of a voltage regulator is high when

• a. Input power is low
• b. Output power is high
• c. Little power is wasted
• d. Input power is high

28. A shunt regulator is inefficient because

• a. It wastes power
• b. It uses a series resistor and a shunt transistor
• c. The ratio of output to input power is low
• d. All of the above

29. A switching regulator is considered

• a. Quiet
• b. Noisy
• c. Inefficient
• d. Linear

30. The zener follower is an example of a

• a. Boost regulator
• b. Shunt regulator
• c. Buck regulator
• d. Series regulator

31. A series regulator is more efficient than a shunt regulator because

• a. It has a series resistor
• b. It can boost the voltage
• c. The pass transistor replaces the series resistor
• d. It switches the pass transistor on and off

32. The efficiency of a linear regulator is high when the

• a. Headroom voltage is low
• b. Pass transistor has a high power dissipation
• c. Zener voltage is low
• d. Output voltage is low

33. If the load is shorted, the pass transistor has the least power dissipation when the regulator has

• a. Foldback limiting
• b. Low efficiency
• c. Buck topology
• d. A high zener voltage

34. The dropout voltage of standard monolithic linear regulators is closest to

• a. 0.3 V
• b. 0.7 V
• c. 2 V
• d. 3.1 V

35. In a buck regulator, the output voltage is filtered with a

• a. Choke-input filter
• b. Capacitor-input filter
• c. Diode
• d. Voltage divider

36. The regulator with the highest efficiency is the

• a. Shunt regulator
• b. Series regulator
• c. Switching regulator
• d. Dc-to-dc converter

37. In a boost regulator, the output voltage is filtered with a

• a. Choke-input filter
• b. Capacitor-input filter
• c. Diode
• d. Voltage divider

38. The buck-boost regulator is also

• a. A step-down regulator
• b. A step-up regulator
• c. An inverting regulator
• d. All of the above

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 23: Oscillators from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Theory of Sinusoidal Oscillation
• MCQs in Wien-Bridge Oscillator
• MCQs in Other RC Oscillators
• MCQs in Colpitts Oscillator
• MCQs in Other LC Oscillators
• MCQs in Quartz Crystals
• MCQs in 555 Timer
• MCQs in Astable Operation of 555 Timer
• MCQs in 555 Circuits
• MCQs in Phase-Locked Loop
• MCQs in Function Generator ICs

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1 . An oscillator always needs an amplifier with

• a. Positive feedback
• b. Negative feedback
• c. Both types of feedback
• d. An LC tank circuit

2. The voltage that starts an oscillator is caused by

• a. Ripple from the power supply
• b. Noise voltage in resistors
• c. The input signal from a generator
• d. Positive feedback

3. The Wien-bridge oscillator is useful

• a. At low frequencies
• b. At high frequencies
• c. With LC tank circuits
• d. At small input signals

4. A lag circuit has a phase angle that is

• a. Between 0 and +90 degrees
• b. Greater than 90 degrees
• c. Between 0 and -90 degrees
• d. The same as the input voltage

5. A coupling circuit is a

• a. Lag circuit
• b. Lead circuit
• c. Lead-lag circuit
• d. Resonant circuit

6. A lead circuit has a phase angle that is

• a. Between 0 and +90 degrees
• b. Greater than 90 degrees
• c. Between 0 and -90 degrees
• d. The same as the input voltage

7. A Wien-bridge oscillator uses

• a. Positive feedback
• b. Negative feedback
• c. Both types of feedback
• d. An LC tank circuit

8. Initially, the loop gain of a Wien-bridge oscillator is

• a. 0
• b. 1
• c. Low
• d. High

9. A Wien bridge is sometimes called a

• a. Notch filter
• b. Twin-T oscillator
• c. Phase shifter
• d. Wheatstone bridge

10. To vary the frequency of a Wien bridge, you can vary

• a. One resistor
• b. Two resistors
• c. Three resistors
• d. One capacitor

11. The phase-shift oscillator usually has

• a. Two lead or lag circuits
• b. Three lead or fagcircuits
• c. A lead-lag circuit
• d. A twin-T filter

12. For oscillations to start in a circuit, the loop gain must be greater than 1 when the phase shift around the loop is

• a. 90 degrees
• b. 180 degrees
• c. 270 degrees
• d. 360 degrees

13. The most widely used LC oscillator is the

• a. Armstrong
• b. Clapp
• C. Colpitts
• d. Hartley

14. Heavy feedback in an LC oscillator

• a. Prevents the circuit from starting
• b. Causes saturation and cutoff
• c. Produces maximum output voltage
• d. Means B is small

15. When Q decreases in a Colpitts oscillator, the frequency of oscillation

• a. Decreases
• b. Remains the same
• c. Increases
• d. Becomes erratic

16. Link coupling refers to

• a. Capacitive coupling
• b. Transformer coupling
• c. Resistive coupling
• d. Power coupling

17. The Hartley oscillator uses

• a. Negative feedback
• b. Two inductors
• c. A tungsten lamp
• d. A tickler coil

18. To vary the frequency of an LC oscillator, you can vary

• a. One resistor
• b. Two resistors
• c. Three resistors
• d. One capacitor

19. Of the following, the one with the most stable frequency is the

• a. Armstrong
• b. Clapp
• c. Colpitts
• d. Hartley

20. The material with the piezoelectric effect is

• a. Quartz
• b. Rochelle salts
• c. Tourmaline
• d. All the above

21. Crystals have a very

• a. Low Q
• b. High Q
• c. Small inductance
• d. Large resistance

22. The series and parallel resonant frequencies of a crystal are

• a. Very close together
• b. Very far apart
• c. Equal
• d. Low frequencies

23. The kind of oscillator found in an electronic wristwatch is the

• a. Armstrong
• b. Clapp
• c. Colpitts
• d. Quartz crystal

24. A monostable 555 timer has the following number of stable states:

• a. 0
• b. 1
• c. 2
• d. 3

25. An astable 555 timer has the following number of stable states:

• a. 0
• b. 1
• c. 2
• d. 3

26. The pulse width out of a one-shot multivibrator increases when the

• a. Supply voltage increases
• b. Timing resistor decreases
• c. UTP decreases
• d. Timing capacitance increases

27. The output waveform of a 555 timer is

• a. sinusoidal
• b. triangular
• c. rectangular
• d. elliptical

28. The quantity that remains constant in a pulse-width modulator is

• a. Pulse width
• b. Period
• c. Duty cycle
• d. Space

29. The quantity that remains constant in a pulse-position modulator is

• a. Pulse width
• b. Period
• c. Duty cycle
• d. Space

30. When a PLL is locked on the input frequency, the VCO frequency

• a. Is less than f0
• b. Is greater than f0
• c. Equals f0
• d. Equals fin

31. The bandwidth of the low-pass filter in a PLL determines the

• a. Capture range
• b. Lock range
• c. Free-running frequency
• d. Phase difference

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 22: Nonlinear Op-Amp Circuits from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Comparators with Zero Reference
• MCQs in Comparators with Nonzero Reference
• MCQs in Comparators with Hysteresis
• MCQs in Window Comparator
• MCQs in the Integrator
• MCQs in Waveform Conversion
• MCQs in Waveform Generation
• MCQs in Active Diode Circuits
• MCQs in the Differentiator
• MCQs in Class D Amplifier

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. In a nonlinear op-amp circuit, the

• a. Op amp never saturates
• b. Feedback loop is never opened
• c. Output shape is the same as the input shape
• d. Op amp may saturate

2. To detect when the input is greater than a particular value, use a

• a. Comparator
• b. Clamper
• c. Limiter
• d. Relaxation oscillator

3. The voltage out of a Schmitt trigger is

• a. A low voltage
• b. A high voltage
• c. Either a low or a high voltage
• d. A sine wave

4. Hysteresis prevents false triggering associated with

• a. A sinusoidal input
• b. Noise voltages
• c. Stray capacitances
• d. Trip points

5. If the input is a rectangular pulse, the output of an integrator is a

• a. Sine wave
• b. Square wave
• c. Ramp
• d. Rectangular pulse

6. When a large sine wave drives a Schmitt trigger, the output is

• a. Rectangular wave
• b. Triangular wave
• c. Rectified sine wave
• d. Series of ramps

7.If pulse width decreases and the period stays the same, the duty cycle

• a. Decreases
• b. Stays the same
• c. Increases
• d. Is zero

8. The output of a relaxation oscillator is a

• a. Sine wave
• b. Square wave
• c. Ramp
• d. Spike

9. If AOL = 200,000, the closed-loop knee voltage of a silicon diode is

• a. 1 uV
• b. 3.5 uV
• c. 7 uV
• d. 14 uV

10. The input to a peak detector is a triangular wave with a peak-to-peak value of 8 V and an average value of 0. The output is

• a. 0
• b. 4 V
• c. 8 V
• d. 16 V

11. The input voltage to a positive limiter is a triangular wave of 8 Vpp and an average value of 0. If the reference level is 2 V, the output is

• a. 0
• b. 2 Vpp
• c. 6 Vpp
• d. 8 Vpp

12. The discharging time constant of a peak detector is 10 ms. The lowest frequency you should use is

• a.10 Hz
• b.100 Hz
• c. 1 kHz
• d. 10 kHz

13. A comparator with a trip point of zero is sometimes called a

• a. Threshold detector
• b. Zero-crossing detector
• c. Positive limit detector
• d. Half-wave detector

14. To work properly, many IC comparators need an external

• a. Compensating capacitor
• b. Pullup resistor
• c. Bypass circuit
• d. Output stage

15. A Schmitt trigger uses

• a. Positive feedback
• b. Negative feedback
• c. Compensating capacitors
• d. Pullup resistors

16. A Schmitt trigger

• a. Is a zero-crossing detector
• b. Has two trip points
• c. Produces triangular output waves
• d. Is designed to trigger on noise voltage

17. A relaxation oscillator depends on the charging of a capacitor through a

• a. Resistor
• b. Inductor
• c. Capacitor
• d. Noninverting input

18. A ramp of voltage

• a. Always increases
• b. Is a rectangular pulse
• c. Increases or decreases at a linear rate
• d. Is produced by hysteresis

19. The op-amp integrator uses

• a. Inductors
• b. The Miller effect
• c. Sinusoidal inputs
• d. Hysteresis

20. The trip point of a comparator is the input voltage that causes

• a. The circuit to oscillate
• b. Peak detection of the input signal
• c. The output to switch states
• d. Clamping to occur

21. In an op-amp integrator, the current through the input resistor flows into the

• a. Inverting input
• b. Noninverting input
• c. Bypass capacitor
• d. Feedback capacitor

22. An active half-wave rectifier has a knee voltage of

• a. VK
• b. 0.7 V
• c. More than 0.7 V
• d. Much less than 0.7 V

23. In an active peak detector, the discharging time constant is

• a. Much longer than the period
• b. Much shorter than the period
• c. Equal to the period
• d. The same as the charging time constant

24. If the reference voltage is zero, the output of an active positive limiter is

• a. Positive
• b. Negative
• c. Either positive or negative
• d. A ramp

25. The output of an active positive clamper is

• a. Positive
• b. Negative
• c. Either positive or negative
• d. A ramp

26. The positive clamper adds

• a. A positive dc voltage to the input
• b. A negative dc voltage to the input
• c. An ac signal to the output
• d. A trip point to the input

27. A window comparator

• a. Has only one usable threshold
• b. Uses hysteresis to speed up response
• c. Clamps the input positively
• d. Detects an input voltage between two limits

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 21: Active Filters from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Ideal Responses
• MCQs in Approximate Response
• MCQs in Passive Filters
• MCQs in First-Order stages
• MCQs in VCVS Unity-Gain Second Order Low-Pass Filters
• MCQs in Higher-Order Filters
• MCQs in VCVS Equal-component Low-Pass Filters
• MCQs in VCVS High-Pass Filters
• MCQs in MFB Bandpass Filters
• MCQs in Bandstop Filters
• MCQs in All-Pass Filters
• MCQs in Biquadratic and State-Variable Filters

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The region between the passband and the stopband is called the

• a. Attenuation
• b. Center
• c. Transition
• d. Ripple

2. The center frequency of a bandpass filter is always equal to

• a. The bandwidth
• b. Geometric average of the cutoff frequencies
• c. Bandwidth divided by Q
• d. 3-dB frequency

3. The Q of a narrowband filter is always

• a. small
• b. equal to BW divided by f0
• c. less than 1
• d. greater than 1

4. A bandstop filter is sometimes called a

• a. Snubber
• b. Phase shifter
• c. Notch filter
• d. Time-delay circuit

5. The all-pass filter has

• a. No passband
• b. One stopband
• c. the same gain at all frequencies
• d. a fast roll-off above cutoff

6. The approximation with a maximally-flat passband is

• a. Chebyshev
• b. Inverse Chebyshev
• c. Elliptic
• d. Bessel

7. The approximation with a rippled passband is

• a. Butterworth
• b. Inverse Chebyshev
• c. Elliptic
• d. Bessel

8. The approximation that distorts digital signals the least is the

• a. Butterworth
• b. Chebyshev
• c. Elliptic
• d. Bessel

9. If a filter has six second order stages and one first-order stage, the order is

• a. 2
• b. 6
• c. 7
• d. 13

10. If a Butterworth filter has 9 second-order stages, its roll-off rate is

• a. 20 dB per decade
• b. 40 dB per decade
• c. 180 dB per decade
• d. 360 dB per decade

11. If n = 10, the approximation with the fastest roll-off in the transition region is

• a. Butterworth
• b. Chebyshev
• c. Inverse Chebyshev
• d. Elliptic

12. The elliptic approximation has a

• a. Slow roll-off rate compared to the Cauer
• b. Rippled stopband
• c. Maximally-flat passband
• d. Monotonic stopband

13. Linear phase shift is equivalent to

• a. Q = 0.707
• b. Maximally-flat stopband
• c. Constant time delay
• d. Rippled passband

14. The filter with the slowest roll-off rate is the

• a. Butterworth
• b. Chebyshev
• c. Elliptic
• d. Bessel

15. A first-order active-filter stage has

• a. One capacitor
• b. Two op amps
• c. Three resistors
• d. a high Q

16. A first-order stage cannot have a

• a. Butterworth response
• b. Chebyshev response
• c. Maximally-flat passband
• d. Rolloff rate of 20 dB per decade

17. Sallen-Key filters are also called

• a. VCVS filters
• b. MFB filters
• c. Biquadratic filters
• d. State-variable filters

18. To build a 10th-order filter, we should cascade

• a. 10 first-stage stages
• b. 5 second-order stages
• c. 3 third-order stages
• d. 2 fourth-order stages

19. To get a Butterworth response with an 8th-order filter, the stages need to have

• a. Equal Q's
• b. Unequal center frequencies
• c. Inductors
• d. Staggered Q's

20. To get a Chebyshev response with a 12th-order filter, the stages need to have

• a. Equal Q's
• b. Equal center frequencies
• c. Staggered bandwidths
• d. Staggered center frequencies and Q's

21. The Q of a Sallen-Key second-order stage depends on the

• a. Voltage gain
• b. Center frequency
• c. Bandwidth
• d. GBW of the op amp

22. With Sallen-Key high-pass filters, the pole frequency must be

• a. Added to the K values
• b. Subtracted from the K values
• c. Multiplied by the K values
• d. Divided by the K values

23. If BW increases, the

• a. Center frequency decreases
• b. Q decreases
• c. Roll-off rate increases
• d. Ripples appear in the stopband

24. When Q is greater than 1, a bandpass filter should be built with

• a. Low-pass and high-pass stages
• b. MFB stages
• c. Notch stages
• d. All-pass stages

25. The all-pass filter is used when

• a. High roll-off rates are needed
• b. Phase shift is important
• c. A maximally-flat passband is needed
• d. A rippled stopband is important

26. A second-order all-pass filter can vary the output phase from

• a. 90 degrees to -90 degrees
• b. 0 degrees to -180 degrees
• c. 0 degrees to -360 degrees
• d. 0 degrees to -720 degrees

27. The all-pass filter is sometimes called a

• a. Tow-Thomas filter
• b. Delay equalizer
• c. KHN filter
• d. State-variable filter

28. The biquadratic filter

• a. Has low component sensitivity
• b. Uses three or more op amps
• c. Is also called Tow-Thomas filter
• d. All of the above

29. The state-variable filter

• a. Has a low-pass, high-pass, and bandpass output
• b. Is difficult to tune
• c. Has high component sensitivity
• d. Uses less than three op amps

30. If GBW is limited, the Q of the stage will

• a. Remain the same
• b. Double
• c. Decrease
• d. Increase

31. To correct for limited GBW, a designer may use

• a. A constant time delay
• b. Predistortion
• c. Linear phase shift
• d. A rippled passband

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 20: Linear Op-Amp Circuits from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Inverting Amplifier Circuits
• MCQs in Noninverting Amplifier Circuit
• MCQs in Inverter and Noninverter Circuits
• MCQs in Differential Amplifier
• MCQs in Instrumentation Amplifiers
• MCQs in Summing Amplifier Circuits
• MCQs in Current Boosters
• MCQs in Voltage Controlled Current Sources
• MCQs in Automatic Gain Control
• MCQs in Single Supply Operation

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. In a linear op-amp circuit, the

• a. Signals are always sine waves
• b. Op amp does not go into saturation
• c. Input impedance is ideally infinite
• d. Gain-bandwidth product is constant

2. In an ac amplifier using an op amp with coupling and bypass capacitors, the output offset voltage is

• a. Zero
• b. Minimum
• c. Maximum
• d. Unchanged

3. To use an op amp, you need at least

• a. One supply voltage
• b. Two supply voltages
• c. One coupling capacitor
• d. One bypass capacitor

4. In a controlled current source with op amps, the circuit acts like a

• a. Voltage amplifier
• b. Current-to-voltage converter
• c. Voltage-to-current converter
• d. Current amplifier

5. An instrumentation amplifier has a high

• a. Output impedance
• b. Power gain
• c. CMRR
• d. Supply voltage

6. A current booster on the output of an op amp will increase the short-circuit current by

• a. ACL
• b. Beta dc
• c. funity
• d. Av

7. Given a voltage reference of +2.5 V, we can get a voltage reference of +15 V by using a

• a. Inverting amplifier
• b. Noninverting amplifier
• c. Differential amplifier
• d. Instrumentation amplifier

8. In a differential amplifier, the CMRR is limited mostly by

• a. CMRR of the op amp
• b. Gain-bandwidth product
• c. Supply voltages
• d. Tolerance of resistors

9. The input signal for an instrumentation amplifier usually comes from

• a. An inverting amplifier
• b. A transducer
• c. A differential amplifier
• d. A Wheatstone bridge

10. In the classic three op-amp instrumentation amplifier, the differential voltage gain is usually produced by the

• a. First stage
• b. Second stage
• c. Mismatched resistors
• d. Output op amp

11. Guard driving reduces the

• a. CMRR of an instrumentation amplifier
• b. Leakage current in the shielded cable
• c. Voltage gain of the first stage
• d. Common-mode input voltage

12. In an averaging circuit, the input resistances are

• a. Equal to the feedback resistance
• b. Less than the feedback resistance
• c. Greater than the feedback resistance
• d. Unequal to each other

13. A D/A converter is an application of the

• a. Adjustable bandwidth circuit
• b. Noninverting amplifier
• c. Voltage-to-current converter
• d. Summing amplifier

14. In a voltage-controlled current source,

• a. A current booster is never used
• b. The load is always floated
• c. A stiff current source drives the load
• d. The load current equals ISC

15. The Howland current source produces a

• a. Unidirectional floating load current
• b. Bidirectional single-ended load current
• c. Unidirectional single-ended load current
• d. Bidirectional floating load current

16. The purpose of AGC is to

• a. Increase the voltage gain when the input signal increases
• b. Convert voltage to current
• c. Keep the output voltage almost constant
• d. Reduce the CMRR of the circuit

17. 1 ppm is equivalent to

• a. 0.1%
• b. 0.01%
• c. 0.001%
• d. 0.0001%

18. An input transducer converts

• a. Voltage to current
• b. Current to voltage
• c. An electrical quantity to a nonelectrical quantity
• d. A nonelectrical quantity to an electrical quantity

19. A thermistor converts

• a. Light to resistance
• b. Temperature to resistance
• c. Voltage to sound
• d. Current to voltage

20. When we trim a resistor, we are

• a. Making a fine adjustment
• b. Reducing its value
• c. Increasing its value
• d. Making a coarse adjustment

21. A D/A converter with four inputs has

• a. Two outputs
• b. Four outputs
• c. Eight outputs
• d. Sixteen outputs

22. An op amp with a rail-to-rail output

• a. Has a current-boosted output
• b. Can swing all the way to either supply voltage
• c. Has a high output impedance
• d. Cannot be less than 0 V.

23. When a JFET is used in an AGC circuit, it acts like a

• a. Switch
• b. Voltage-controlled current source
• c. Voltage-controlled resistance
• d. Capacitance

24. If an op amp has only a positive supply voltage, its output cannot

• a. Be negative
• b. Be zero
• c. Equal the supply voltage
• d. Be ac coupled

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 19: Negative Feedback from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Four Types of Negative Feedback
• MCQs in VCVS Voltage Gain
• MCQs in ICVS Amplifier
• MCQs in VCIS Amplifier
• MCQs in ICIS Amplifier
• MCQs in Bandwidth

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. With negative feedback, the returning signal

• a. Aids the input signal
• b. Opposes the input signal
• c. Is proportional to output current
• d. Is proportional to differential voltage gain

2. How many types of negative feedback are there?

• a. One
• b. Two
• c. Three
• d. Four

3. A VCVS amplifier approximates an ideal

• a. Voltage amplifier
• b. Current-to-voltage converter
• c. Voltage-to-current converter
• d. Current amplifier

4. The voltage between the input terminals of an ideal op amp is

• a. Zero
• b. Very small
• c. Very large
• d. Equal to the input voltage

5. When an op amp is not saturated, the voltages at the non-inverting and inverting inputs are

• a. Almost equal
• b. Much different
• c. Equal to the output voltage
• d. Equal to +15 V

6. The feedback fraction B

• a. Is always less than 1
• b. Is usually greater than 1
• c. May equal 1
• d. May not equal 1

7. An ICVS amplifier has no output voltage. A possible trouble is

• a. No negative supply voltage
• b. Shorted feedback resistor
• c. No feedback voltage
• d. Open load resistor

8. In a VCVS amplifier, any decrease in open-loop voltage gain produces an increase in

• a. Output voltage
• b. Error voltage
• c. Feedback voltage
• d. Input voltage

9. The open-loop voltage gain equals the

• a. Gain with negative feedback
• b. Differential voltage gain of the op amp
• c. Gain when B is 1
• d. Gain at funity

10. The loop gain AOLB

• a. Is usually much smaller than 1
• b. Is usually much greater than 1
• c. May not equal 1
• d. Is between 0 and 1

11. The closed-loop input impedance with an ICVS amplifier is

• a. Usually larger than the open-loop input impedance
• b. Equal to the open-loop input impedance
• c. Sometimes less than the open-loop impedance
• d. Ideally zero

12. With an ICVS amplifier, the circuit approximates an ideal

• a. Voltage amplifier
• b. Current-to-voltage converter
• c. Voltage-to-current converter
• d. Current amplifier

13. Negative feedback reduces the

• a. Feedback fraction
• b. Distortion
• c. Input offset voltage
• d. Loop gain

14. A voltage follower has a voltage gain of

• a. Much less than 1
• b. 1
• c. More than 1
• d. A

15. The voltage between the input terminals of a real op amp is

• a. Zero
• b. Very small
• c. Very large
• d. Equal to the input voltage

16. The transresistance of an amplifier is the ratio of its

• a. Output current to input voltage
• b. Input voltage to output current
• c. Output voltage to input voltage
• d. Output voltage to input current

17. Current cannot flow to ground through

• a. A mechanical ground
• b. An ac ground
• c. A virtual ground
• d. An ordinary ground

18. In a current-to-voltage converter, the input current flows

• a. Through the input impedance of the op amp
• b. Through the feedback resistor
• c. To ground
• d. Through the load resistor

19. The input impedance of a current-to-voltage converter is

• a. Small
• b. Large
• c. Ideally zero
• d. Ideally infinite

20. The open-loop bandwidth equals

• a. funity
• b. f2(OL)
• c. funity/ACL
• d. fmax

21. The closed-loop bandwidth equals

• a. funity
• b. f2(OL)
• c. funity/ACL
• d. fmax

22. For a given op amp, which of these is constant?

• a. f2(CL)
• b. Feedback voltage
• c. ACL
• d. ACLf2(CL)

23. Negative feedback does not improve

• a. Stability of voltage gain
• b. Nonlinear distortion in later stages
• c. Output offset voltage
• d. Power bandwidth

24. An ICVS amplifier is saturated. A possible trouble is

• a. No supply voltages
• b. Open feedback resistor
• c. No input voltage
• d. Open load resistor

25. A VCVS amplifier has no output voltage. A possible trouble is

• a. Shorted load resistor
• b. Open feedback resistor
• c. Excessive input voltage
• d. Open load resistor

26. An ICIS amplifier is saturated. A possible trouble is

• a. Shorted load resistor
• b. R2 is open
• c. No input voltage
• d. Open load resistor

27. An ICVS amplifier has no output voltage. A possible trouble is

• a. No positive supply voltage
• b. Open feedback resistor
• c. No feedback voltage
• d. Shorted load resistor

28. The closed-loop input impedance in a VCVS amplifier is

• a. Usually larger than the open-loop input impedance
• b. Equal to the open-loop input impedance
• c. Sometimes less than the open-loop input impedance
• d. Ideally zero

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 18: Operational Amplifiers from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Introduction to Operational Amplifiers
• MCQs in 741 Op Amp
• MCQs in Inverting Amplifier
• MCQs in Non-inverting Amplifier
• MCQs in two Op Amp Appplications
• MCQs in Linear ICs
• MCQs in Op Amp as Surface-Mount Devices

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. What usually controls the open-loop cutoff frequency of an op amp?

• a. Stray-wiring capacitance
• b. Base-emitter capacitance
• c. Collector-base capacitance
• d. Compensating capacitance

2. A compensating capacitor prevents

• a. Voltage gain
• b. Oscillations
• c. Input offset current
• d. Power bandwidth

3. At the unity-gain frequency, the open-loop voltage gain is

• a. 1
• b. Amid
• c. Zero
• d. Very large

4. The cutoff frequency of an op amp equals the unity-gain frequency divided by

• a. the cutoff frequency
• b. Closed-loop voltage gain
• c. Unity
• d. Common-mode voltage gain

5. If the cutoff frequency is 15 Hz and the midband open-loop voltage gain is 1,000,000, the unity-gain frequency is

• a. 25 Hz
• b. 1 MHz
• c. 1.5 MHz
• d. 15 MHz

6. If the unity-gain frequency is 5 MHz and the midband open loop voltage gain is 200,000, the cutoff frequency is

• a. 25 Hz
• b. 1 MHz
• c. 1.5 MHz
• d. 15 MHz

7. The initial slope of a sine wave is directly proportional to

• a. Slew rate
• b. Frequency
• c. Voltage gain
• d. Capacitance

8. When the initial slope of a sine wave is greater than the slew rate,

• a. Distortion occurs
• b. Linear operation occurs
• c. Voltage gain is maximum
• d. The op amp works best

9. The power bandwidth increases when

• a. Frequency decreases
• b. Peak value decreases
• c. Initial slope decreases
• d. Voltage gain increases

10. A 741C uses

• a. Discrete resistors
• b. Inductors
• c. Active-load resistors
• d. A large coupling capacitor

11. A 741C cannot work without

• a. Discrete resistors
• b. Passive loading
• c. Dc return paths on the two bases
• d. A small coupling capacitor

12. The input impedance of a BIFET op amp is

• a. Low
• b. Medium
• c. High
• d. Extremely high

13. An LF157A is a

• a. Diff amp
• b. Source follower
• c. Bipolar op amp
• d. BIFET op amp

14. If the two supply voltages are plus and minus 15 V, the MPP value of an op amp is closest to

• a. 0
• b. +15V
• c. -15 V
• d. 30 V

15. The open-loop cutoff frequency of a 741C is controlled by

• a. A coupling capacitor
• b. The output short circuit current
• c. The power bandwidth
• d. A compensating capacitor

16. The 741C has a unity-gain frequency of

• a. 10 Hz
• b. 20 kHz
• c. 1 MHz
• d. 15 MHz

17. The unity-gain frequency equals the product of closed-loop voltage gain and the

• a. Compensating capacitance
• b. Tail current
• c. Closed-loop cutoff frequency
• d. Load resistance

18. If the unity frequency is 10 MHz and midband open-loop voltage gain is 1,000,000, then the open-loop cutoff frequency of the op amp is

• a. 10 Hz
• b. 20 Hz
• c. 50 Hz
• d. 100 Hz

19. The initial slope of a sine wave increases when

• a. Frequency decreases
• b. Peak value increases
• c. Cc increases
• d. Slew rate decreases

20. If the frequency is greater than the power bandwidth,

• a. Slew-rate distortion occurs
• b. A normal output signal occurs
• c. Output offset voltage increases
• d. Distortion may occur

21. An op amp has an open base resistor. The output voltage will be

• a. Zero
• b. Slightly different from zero
• c. Maximum positive or negative
• d. An amplified sine wave

22. An op amp has a voltage gain of 500,000. If the output voltage is 1 V, the input voltage is

• a. 2 microvolts
• b. 5 mV
• c. 10 mV
• d. 1 V

23. A 741C has supply voltages of plus and minus 15 V. If the load resistance is large, the MPP value is

• a. 0
• b. +15 V
• c. 27 V
• d. 30 V

24. Above the cutoff frequency, the voltage gain of a 741C decreases approximately

• a. 10 dB per decade
• b. 20 dB per octave
• c. 10 dB per octave
• d. 20 dB per decade

25. The voltage gain of an op amp is unity at the

• a. Cutoff frequency
• b. Unity-gain frequency
• c. Generator frequency
• d. Power bandwidth

26. When slew-rate distortion of a sine wave occurs, the output

• a. Is larger
• b. Appears triangular
• c. Is normal
• d. Has no offset

27. A 741C has

• a. A voltage gain of 100,000
• b. An input impedance of 2 Mohm
• c. An output impedance of 75 ohm
• d. All of the above

28. The closed-loop voltage gain of an inverting amplifier equals

• a. The ratio of the input resistance to the feedback resistance
• b. The open-loop voltage gain
• c. The feedback resistance divided by the input resistance
• d. The input resistance

29. The non-inverting amplifier has a

• a. Large closed-loop voltage gain
• b. Small open-loop voltage gain
• c. Large closed-loop input impedance
• d. Large closed-loop output impedance

30. The voltage follower has a

• a. Closed-loop voltage gain of unity
• b. Small open-loop voltage gain
• c. Closed-loop bandwidth of zero
• d. Large closed-loop output impedance

31. A summing amplifier can have

• a. No more than two input signals
• b. Two or more input signals
• c. A closed-loop input impedance of infinity
• d. A small open-loop voltage gain

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 17: Differential Amplifiers from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Differential Amplifiers
• MCQs in DC Analysis of Differential Amplifiers
• MCQs in AC Analysis of Differential Amplifiers
• MCQs in Input Characteristics of an Op Amp
• MCQs in Common Mode Gain
• MCQs in Integrated Circuits
• MCQs in Current Mirror
• MCQs in Loaded Differential Amplifiers

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Monolithic ICs are

• a. Forms of discrete circuits
• b. On a single chip
• c. Combinations of thin-film and thick-film circuits
• d. Also called hybrid ICs

2. The op amp can amplify

• a. AC signals only
• b. DC signals only
• c. Both ac and dc signals
• d. Neither ac nor dc signals

3. Components are soldered together in

• a. Discrete circuits
• b. Integrated circuits
• c. SSI
• d. Monolithic ICs

4. The tail current of a diff amp is

• a. Half of either collector current
• b. Equal to either collector current
• c. Two times either collector current
• d. Equal to the difference in base currents

5. The node voltage at the top of the tail resistor is closest to

• a. Collector supply voltage
• b. Zero
• c. Emitter supply voltage
• d. Tail current times base resistance

6. The input offset current equals the

• a. Difference between two base currents
• b. Average of two base currents
• c. Collector current divided by current gain
• d. Difference between two base-emitter voltages

7. The tail current equals the

• a. Difference between two emitter currents
• b. Sum of two emitter currents
• c. Collector current divided by current gain
• d. Collector voltage divided by collector resistance

8.The voltage gain of a diff amp with a differential output is equal to RC divided by

• a. re'
• b. re'/2
• c. 2re'
• d. RE

9. The input impedance of a differential amplifier equals re' times

• a. 0
• b. RC
• c. RE
• d. 2 times Beta

10. A dc signal has a frequency of

• a. 0
• b. 60 Hz
• c. 0 to over 1 MHz
• d. 1 MHz

11. When the two input terminals of a diff amp are grounded,

• a. The base currents are equal
• b. The collector currents are equal
• c. An output error voltage usually exists
• d. The ac output voltage is zero

12. One source of output error voltage is

• a. Input bias current
• b. Difference in collector resistors
• c. Tail current
• d. Common-mode voltage gain

13. A common-mode signal is applied to

• a. The non-inverting input
• b. The inverting input
• c. Both inputs
• d. Top of the tail resistor

14. The common-mode voltage gain is

• a. Smaller than voltage gain
• b. Equal to voltage gain
• c. Greater than voltage gain
• d. None of the above

15. The input stage of an op amp is usually a

• a. Differential amplifier
• b. Class B push-pull amplifier
• c. CE amplifier
• d. Swamped amplifier

16. The tail of a diff amp acts like a

• a. Battery
• b. Current source
• c. Transistor
• d. Diode

17. The common-mode voltage gain of a diff amp is equal to RC divided by

• a. re'
• b. re'/2
• c. 2re'
• d. 2RE

18. When the two bases are grounded in a diff amp, the voltage across each emitter diode is

• a. Zero
• b. 0.7 V
• c. The same
• d. High

19. The common-mode rejection ratio is

• a. Very low
• b. Often expressed in decibels
• c. Equal to the voltage gain
• d. Equal to the common-mode voltage gain

20. The typical input stage of an op amp has a

• a. Single-ended input and single-ended output
• b. Single-ended input and differential output
• c. Differential input and single-ended output
• d. Differential input and differential output

21. The input offset current is usually

• a. Less than the input bias current
• b. Equal to zero
• c. Less than the input offset voltage
• d. Unimportant when a base resistor is used

22. With both bases grounded, the only offset that produces an error is the

• a. Input offset current
• b. Input bias current
• c. Input offset voltage
• d. Beta

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 16: Frequency Effects from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Frequency Response Amplifiers
• MCQs in Decibel Power Gain
• MCQs in Decibel Voltage Gain
• MCQs in Impedance Matching
• MCQs in Decibel Above the Reference
• MCQs in Bode Plots
• MCQs in Miller Effect
• MCQs in Risetime Bandwidth Relationship
• MCQs in Frequency Analysis of BJT Stages
• MCQs in Frequency Analysis of FET Stages
• MCQs in Frequency Effects of Surface-Mount Circuits

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Frequency response is a graph of voltage gain versus

• a. Frequency
• b. Power gain
• c. Input voltage
• d. Output voltage

2. At low frequencies, the coupling capacitors produce a decrease in

• a. Input resistance
• b. Voltage gain
• c. Generator resistance
• d. Generator voltage

3. The stray-wiring capacitance has an effect on the

• a. Lower cutoff frequency
• b. Midband voltage gain
• c. Upper cutoff frequency
• d. Input resistance

4. At the lower or upper cutoff frequency, the voltage gain is

• a. 0.35Amid
• b. 0.5Amid
• c. 0.707Amid
• d. 0.995Amid

5. If the power gain doubles, the decibel power gain increases by

• a. A factor of 2
• b. 3 dB
• c. 6 dB
• d. 10 dB

6. If the voltage gain doubles, the decibel voltage gain increases by

• a. A factor of 2
• b. 3 dB
• c. 6 dB
• d. 10 dB

7. If the voltage gain is 10, the decibel voltage gain is

• a. 6 dB
• b. 20 dB
• c. 40 dB
• d. 60 dB

8. If the voltage gain is 100, the decibel voltage gain is

• a. 6 dB
• b. 20 dB
• c. 40 dB
• d. 60 dB

9. If the voltage gain is 2000, the decibel voltage gain is

• a. 40 dB
• b. 46 dB
• c. 66 dB
• d. 86 dB

10. Two stages have decibel voltage gains of 20 and 40 dB. The total ordinary voltage gain is

• a.1
• b. 10
• c. 100
• d. 1000

11. Two stages have voltage gains of 100 and 200. The total decibel voltage gain is

• a. 46 dB
• b. 66 dB
• c. 86 dB
• d. 106 dB

12. One frequency is 8 times another frequency. How many octaves apart are the two frequencies?

• a. 1
• b. 2
• c. 3
• d. 4

13. If f = 1 MHz, and f₂ = 10 Hz, the ratio f/f₂ represents how many decades?

• a. 2
• b. 3
• c. 4
• d. 5

14. Semi-logarithmic paper means

• a. One axis is linear, and the other is logarithmic
• b. One axis is linear, and the other is semi-logarithmic
• c. Both axes are semi-logarithmic
• d. Neither axis is linear

15. If you want to improve the high-frequency response of an amplifier, which of these would you try?

• a. Decrease the coupling capacitances.
• b. Increase the emitter bypass capacitance.
• c. Shorten leads as much as possible.
• d. Increase the generator resistance.

16. The voltage gain of an amplifier decreases 20 dB per decade above 20 kHz. If the midband voltage gain is 86 dB, what is the ordinary voltage gain at 20 MHz?

• a. 20
• b. 200
• c. 2000
• d. 20,000

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 15: Thyristors from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Four-Layer Diode
• MCQs in Silicon Controlled Rectifier (SCR)
• MCQs in SCR Crowbar
• MCQs in SCR Phase Control
• MCQs in Bidirectional Thyristor
• MCQs in IGBTs
• MCQs in Other Thyristors

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. A thyristor can be used as

• a. A resistor
• b. An amplifier
• c. A switch
• d. A power source

2. Positive feedback means the returning signal

• a. Opposes the original change
• b. Aids the original change
• c. Is equivalent to negative feedback
• d. Is amplified

3. A latch always uses

• a. Transistors
• b. Feedback
• c. Current
• d. Positive feedback

4. To turn on a four-layer diode, you need

• a. A positive trigger
• b. low-current drop out
• c. Breakover
• d. Reverse-bias triggering

5. The minimum input current that can turn on a thyristor is called the

• a. Holding current
• b. Trigger current
• c. Breakover current
• d. Low-current drop out

6. The only way to stop a four-layer diode that is conducting is by

• a. A positive trigger
• b. Low-current drop out
• c. Breakover
• d. Reverse-bias triggering

7. The minimum anode current that keeps a thyristor turned on is called the

• a. Holding current
• b. Trigger current
• c. Breakover current
• d. Low-current drop out

8. A silicon controlled rectifier has

• a. Two external leads
• b. Three external leads
• c. Four external leads
• d. Three doped regions

9. A SCR is usually turned on by

• a. Breakover
• b. A gate trigger
• c. Breakdown
• d. Holding current

10. SCRs are

• a. Low-power devices
• b. Four-layer diodes
• c. High-current devices
• d. Bidirectional

11. The usual way to protect a load from excessive supply voltage is with a

• a. Crowbar
• b. Zener diode
• c. Four-layer diode
• d. Thyristor

12. An RC snubber protects an SCR against

• a. Supply over voltages
• b. False triggering
• c. Breakover
• d. Crowbarring

13. When a crowbar is used with a power supply, the supply needs to have a fuse or

• a. Adequate trigger current
• b. Holding current
• c. Filtering
• d. Current limiting

14. The photo-SCR responds to

• a. Current
• b. Voltage
• c. Humidity
• d. Light

15. The diac is a

• a. Transistor
• b. Unidirectional device
• c. Three-layer device
• d. Bidirectional device

16. The triac is equivalent to

• a. A four-layer diode
• b. Two diacs in parallel
• c. A thyristor with a gate lead
• d. Two SCRs in parallel

17. The unijunction transistor acts as a

• a. Four-layer diode
• b. Diac
• c. Triac
• d. Latch

18. Any thyristor can be turned on with

• a. Breakover
• b. Forward-bias triggering
• c. Low-current dropout
• d. Reverse-bias triggering

19. A Shockley diode is the same as a

• a. four-layer diode
• b. SCR
• c. diac
• d. triac

20. The trigger voltage of an SCR is closest to

• a. 0
• b. 0.7 V
• c. 4 V
• d. Breakover voltage

21. Any thyristor can be turned off with

• a. Breakover
• b. Forward-bias triggering
• c. Low-current drop out
• d. Reverse-bias triggering

22. Exceeding the critical rate of rise produces

• a. Excessive power dissipation
• b. False triggering
• c. Low-current drop out
• d. Reverse-bias triggering

23. A four-layer diode is sometimes called a

• a. Unijunction transistor
• b. Diac
• c. PNPN diode
• d. Switch

24. A latch is based on

• a. Negative feedback
• b. Positive feedback
• c. The four-layer diode
• d. SCR action

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

---

This is the Multiple Choice Questions in Chapter 14: Metal Oxide Semiconductor Field-Effect Transistor (MOSFETs) from the book Electronic Principles 7th Edition by Albert Malvino. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

Topic Outline

• MCQs in Depletion-Mode MOSFET
• MCQs in D-MOSFET Curves
• MCQs in Depletion-Mode MOSFET Amplifier
• MCQs in Enhancement-Mode MOSFET
• MCQs in Ohmnic Region
• MCQs in Digital Switching
• MCQs in CMOS
• MCQs in Power FETs
• MCQs in E-MOSFET Amplifiers
• MCQs in MOSFET Testing

Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Which of the following devices revolutionized the computer industry?

• a. JFET
• b. D-MOSFET
• c. E-MOSFET
• d. Power FET

2. The voltage that turns on an EMOS device is the

• a. Gate-source cutoff voltage
• b. Pinch-off voltage
• c. Threshold voltage
• d. Knee voltage

3. Which of these may appear on the data sheet of an enhancement-mode MOSFET?

• a. VGS(th)
• b. ID(on)
• c. VGS(on)
• d. All of the above

4. The VGS(on) of an n-channel E-MOSFET is

• a. Less than the threshold voltage
• b. Equal to the gate-source cutoff voltage
• c. Greater than VDS(on)
• d. Greater than VGS(th)

5. An ordinary resistor is an example of

• a. A three-terminal device
• b. An active load
• c. A passive load
• d. A switching device

6. An E-MOSFET with its gate connected to its drain is an example of

• a. A three-terminal device
• b. An active load
• c. A passive load
• d. A switching device

7. An E-MOSFET that operates at cutoff or in the ohmic region is an example of

• a. A current source
• b. An active load
• c. A passive load
• d. A switching device

8. CMOS stands for

• a. Common MOS
• b. Active-load switching
• c. p-channel and n-channel devices
• d. Complementary MOS

9. VGS(on) is always

• a. Less than VGS(th)
• b. Equal to VDS(on)
• c. Greater than VGS(th)
• d. Negative

10. With active-load switching, the upper E-MOSFET is a

• a. Two-terminal device
• b. Three-terminal device
• c. Switch
• d. Small resistance

11. CMOS devices use

• a. Bipolar transistors
• b. Complementary E-MOSFETs
• c. Class A operation
• d. DMOS devices

12. The main advantage of CMOS is its

• a. High power rating
• b. Small-signal operation
• c. Switching capability
• d. Low power consumption

13. Power FETs are

• a. Integrated circuits
• b. Small-signal devices
• c. Used mostly with analog signals
• d. Used to switch large currents

14. When the internal temperature increases in a power FET, the

• a. Threshold voltage increases
• b. Gate current decreases
• c. Drain current decreases
• d. Saturation current increases

15. Most small-signal E-MOSFETs are found in

• a. Heavy-current applications
• b. Discrete circuits
• c. Disk drives
• d. Integrated circuits

16. Most power FETS are

• a. Used in high-current applications
• b. Digital computers
• c. RF stages
• d. Integrated circuits

17. An n-channel E-MOSFET conducts when it has

• a. VGS > VP
• b. An N-Type inversion layer
• c. VDS > 0
• d. Depletion layers

18. With CMOS, the upper MOSFET is

• a. A passive load
• b. An active load
• c. Nonconducting
• d. Complementary

19. The high output of a CMOS inverter is

• a. VDD/2
• b. VGS
• c. VDS
• d. VDD

20. The RDS(on) of a power FET

• a. Is always large
• b. Has a negative temperature coefficient
• c. Has a positive temperature coefficient
• d. Is an active load

Check your work.

Complete List of MCQs in Electronic Principles by Albert Malvino

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