This is the Section 1 Module 7 of the compiled Electronics Review Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet. This particular reviewer in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Electronics Engineering Reviewers: Section 1 Module 7
1. The Sallen Key filter
- Second order filter
2. The drain current in the current circuit when constant current area increases.
- The gate to source bias voltage decreases
3. Semiconductor is reversed bias with large enough voltage will conduct, this is because of
- avalanche effect
4. T-MOSFET is a kind of
- EMOSFET
5. Difference between SCR and SCS
- Has two gate terminals
6. Which of the following characteristics does not necessarily apply to op-amp?
- Low power
7. A phase shift through op-amp is because of
- Internal RC circuit
8. A FET does not has
- Forward biased PN junction
9. An operational amplifier must have at least how many usable terminals?
- 5
10. Generating a voltage in a generator will likely to happen only when
- There is relative 1 motion between conducting wire and magnetic line of force.
11. Two essentially parts of rotating generator.
- Electro/permanent magnet and armature winding
12. Generally a DC generator
- The armature winding is rotated with respect to a magnetic force produced by electromagnets or permanent magnets.
13. A junction of two conductors that exhibits electrical characteristics during changing temperature condition.
- Thermoelectric conduction
14. How does electric field in JFET established?
- By the presence of charge at gate terminal during reversed bias.
15. Relaxation oscillators are based on
- By charging and discharging of capacitor
16. Load regulation
- Changing load and output voltage remains constant
17. Transient suppression minimized the chance of
- Diode failure
18. If two waves, have the same frequency and the same phase, the composite wave is equal to:
- Magnitude of the sum of two original waves
19. The current consists mainly of holes when a JFET
- Has P – type channel
20. A basic isolation amplifiers has 3 electrically isolated parts
- Input, output, power
21. The most important transistor characteristic curve
- Output characteristic curve
22. In a voltage divider bias npn transistor, what happen when the resistor on the higher place opens?
- The transistor goes to cut-off
23. Which statement is true about alternator?
- High speed alternator is smaller than the lower speed
24. What is the used of noise generator?
- Evaluating the noise characteristics of an amplifier.
25.
- make the feedback and input resistances as smaller as possible.
26. What is the purpose of current limiting in regulators?
- To protect the regulator from excessive current.
27. In power distribution, the most commonly used insulator
- Porcelain
28. In Zener diode, when the zener voltage is 3.6 V
- Zener breakdown
29. The realistic open loop gain
- 100, 000
30. When frequency of the open loop gain is equal to 1.
- Unity gain frequency
31. Phase shift of the ac sine wave by 90 degrees is the same as the
- Rotating from left/right by ¼ cycle
32. In RL circuits, the ratio of XL/R decreases, phase angle
- Decreases
33. Common-base configuration application
- Radio frequency power amplifier
34. Found at the output of the op-amp
- complementary amplifier
35. SCR differs from four layer diode
- It has gate terminal
36. Difference between SCR and SCS
- Has two gate terminals
37. Air works well as dielectric because
- It has low loss
38. The use of I layer in PIN diode
- Minimize the diode capacitance
39. TMOSFET is a kind of
- EMOSFET
40. Which FET has a wide and short effective channel
- VMOSFET
41. A circuit used for voltage equalization during on-off switching action of SCRs in series
- Snubber circuit
42. The external resistor of instrumentation amplifier is used to
- sustain voltage gain
43. The low pass is cascaded to he high pass filter, the critical frequency of the low pass filter is
- Greater than the critical frequency of the low pass filter
44. The most popular op-amp packages are the metal can, 8-pin DIP, the SMT. Which of the following corresponds to TO-99?
- Metal can
45. The magnitude of the op-amps input offset voltage before it can be classified as a low input offset voltage op-amp.
- 0.2 mV
46. High voltage is used in long distance power transmission because
- The I2R losses are lower
47. The forward breakover voltage of a silicon diode is
- About 0.6V
48. Which bipolar amplifier type has same distortion in the signal wave, with collector current during the most, but not at all of the cycle
- Class AB2
49. The frequency at which the crystal oscillator functions is determined mainly by
- The thickness of the crystal
50. In an AND gate the output is high
- Only when all inputs are high
51. In an Exclusive OR gate the output is high
- Only when the inputs have opposite logic states
52. What type of generator consists of a single coil rotated in a magnetic field?
- Elementary generator
53. Which does not affect the inductance of the coil
- Diameter of the wire
54. When two or more generators are applying a common load
- Parallel generators
55. An early version of the field effect transistor in which limited control of current carriers near the surface of a semiconductor bar or film was obtained by an external field applied transversely
- Fieldistor
56. A push-pull amplifier that uses NPN and PNP transistors to amplify the positive and negative cycles respectively
- Complementary symmetry amplifier
57. The frequency at which open loop gain is equal to one
- Unity gain frequency
58. Which of the ff. is does not have an output terminal of a 555 timer?
- Clock
59. In an OTA transconductance varies with
- Bias current
60. The efficiency of a class AB amplifier is
- Slightly less than class B
61. When choosing dc motor
- Speed-torque
62. It is a modified version of wheatstone-bridge, it is used to measure low resistances
- Kelvin Double bridge
63. Simplified wheatstone bridge, the ratio arm is replaced by constant time of uniform cross section exactly 100 cm long
- Slide wire bridge
64. Used to measure the impedance of both inductance and capacitance at higher frequencies
- Radio frequency bridge
65. This bridge is used to measure capacitance
- Schering bridge
66. The peak current of a class A amplifier
- Quiescent current
67. In Rectifier diode, current is approximately by how much of an ac cycle
- 180o
68. The armature winding is connected to its own positive and negative terminals
- Self excitation
69. Configuration with highest amplification
- Common-emitter
70. Substance that generates voltage when exposed to light
- Photovoltaic material
71. A two stage transistor amplifier in which the output collector of the first stage provides input to the emitter of the second stage. The final output is taken from the collector of the second or last stage.
- Cascade configuration
72. The output on the first stage amplifier is connected on the base of the second stage amplifier. The configuration is
- Cascade configuration
73. The power amplifier is connected using
- Transformer coupling
74. It shows or displays and print the waveform of the transmitter and harmonics
- Spectrum analyzer
75. It shows the wave for a long period of time
- Storage oscilloscope
76. When the input of the op-amp is noisy
- Change back and forth erratically between two states
77. A basic instrumentation amplifier is formed bt
- 3 op-amps and 7 resistors
78. When triangular wave is the input of the integrator, what is the output?
- Square wave
79. When severe arcing is noticeable in motor
- During starting
80. The power dissipation of class C amplifier
- Very low
81. Cross-over distortion is mainly problem of
- Class B
82. Acoustic feedback in public address system
- It serves no purpose
83. In op-amp the common mode voltage gain is 10 and the differential mode voltage gain is 20000, calculate the CMRR
- 2000
84. In wein bridge oscillator positive feedback circuit has
- Lead lag circuit
85. In all the resistor combination which provides lesser noise in the op-amp
- Make both feedback and input resistance as small as possible
86. When two inputs of the multiplier is connected together it operates as
- Squaring circuit
87. Provides offset nulling
- Zero output at error voltage
88. Damping factor at the filter is set by
- Negative feedback circuit
89. In resonance, the resistance in common-base decrease will
- Not affect the common-collector
90. Case of load regulator
- When load changes the output voltage stays constant
91. UJT never has
- Forward biased PN junction
92. In voltage divider bias NPN transistor, the upper voltage divider resistor when open is
- The transistor goes to cutoff
93. Most wires of the isolation amplifiers are connected at
- Transformer
94. The ac generator is
- By dc-generator supply to the dc-excitation to the rotating field
95. The operation of logarithmic amplifiers is based on
- Logarithmically change of a PN junction
96. What term applies to the use of two or more generators to supply a common load?
- Parallel operation/generators
97. Change in Input offset current due to temperature change
- Input offset current drift
98. The UJT has
- A bilateral conduction
99. A DC motor
- Is composed of armature winding and permanent magnet
100. Is a measure of an op-amp’s ability to reject common-mode inputs.
- CMRR
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