Online Questions and Answers Topic Outline
- MCQs in Ideal Diode
- MCQs in Semiconductor Materials
- MCQs in Energy Levels
- MCQs in Extrinsic Materials—n- and p-Type
- MCQs in Semiconductor Diode
- MCQs in Resistance Levels
- MCQs in Diode Equivalent Circuits
- MCQs in Diode Specification Sheets
- MCQs in Transition and Diffusion Capacitance
- MCQs in Reverse Recovery Time
- MCQs in Semiconductor Diode Notation
- MCQs in Diode Testing
- MCQs in Zener Diodes
- MCQs in Light-Emitting Diodes (LEDs)
- MCQs in Diode Arrays—Integrated Circuits
Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. How many terminals does a diode have?
- A) 1
- B) 2
- C) 3
- D) 4
2. What is the resistor value of an ideal diode in the region of conduction?
- A) 0
- B) 5 k
- C) Undefined
- D) Infinity
3. What is the state of an ideal diode in the region of nonconduction?
- A) An open circuit
- B) A short circuit
- C) Unpredictable
- D) Undefined
4.The diode _____.
- A) is the simplest of semiconductor devices
- B) has characteristics that closely match those of a simple switch
- C) is a two-terminal device
- D) All of the above
5.The ideal diode is a(n) _____ circuit in the region of nonconduction.
- A) open
- B) short
6.Which of the following is an atom composed of?
- A) Electrons
- B) Protons
- C) Neutrons
- D) All of the above
7. How many orbiting electrons does the germanium atom have?
- A) 4
- B) 14
- C) 32
- D) 41
8.How many valence electrons does a silicon atom have?
- A) 1
- B) 2
- C) 3
- D) 4
9.One eV is equal to _____ J.
- A) 6.02 × 1023
- B) 1.6 × 10–19
- C) 6.25 × 1018
- D) 1.66 × 10–24
10. Which of the following elements is most frequently used for doping pure Ge or Si?
- A) Boron
- B) Gallium
- C) Indium
- D) All of the above
11.The diffused impurities with _____ valence electrons are called donor atoms.
- A) 4
- B) 3
- C) 5
- D) 0
12.In what state is a silicon diode if the voltage drop across it is about 0.7 V?
- A) No bias
- B) Forward bias
- C) Reverse bias
- D) Zener region
13.What unit is used to represent the level of a diode forward current IF?
- A) pA
- B) nA
- C) A
- D) mA
14.Which of the following ratings is true?
- A) Si diodes have higher PIV and narrower temperature ranges than Ge diodes.
- B) Si diodes have higher PIV and wider temperature ranges than Ge diodes.
- C) Si diodes have lower PIV and narrower temperature ranges than Ge diodes.
- D) Si diodes have lower PIV and wider temperature ranges than Ge diodes.
15.It is not uncommon for a germanium diode with an Is in the order of 1–2 A at 25°C to have leakage current of 0.1 mA at a temperature of 100°C.
- A) True
- B) False
16. Calculate static resistance RD of a diode having ID = 30 mA and VD = 0.75 V.
- A) 25
- B) 40
- C) 0.04
- D) 0.025
17. Calculate ID if RD = 30 and VD = 0.84 V.
- A) 28 mA
- B) 0.028 mA
- C) 2.8 A
- D) 280 A
18. Refer to Figure 1.27. Calculate the dynamic resistance rd of a diode having ID = 27.5 mA.
- A) 0
- B) 2
- C) 5
- D) 26
19. Determining rd to a high degree of accuracy from a characteristic curve is very accurate.
- A) True
- B) False
20. The _____ diode model is employed most frequently in the analysis of electronic systems.
- A) ideal device
- B) simplified
- C) piecewise-linear
21.Calculate the power dissipation of a diode having ID = 40 mA.
- A) 28 mW
- B) 28 W
- C) 280 mW
- D) Undefined
22. Which capacitance dominates in the reverse-bias region?
- A) depletion
- B) conversion
- C) 40 Diffusion
- D) 140 None of the above
23. Which capacitance dominates in the forward-bias region?
- A) Diffusion
- B) Transition
- C) Depletion
- D) None of the above
24. At what kind of operating frequency diffusion or transition is a capacitor represented in parallel with the ideal diode?
- A) Low frequency
- B) Moderate frequency
- C) Mid frequency
- D) Very high frequency
25. What is the value of the transition capacitance for a silicon diode when VD = 0?
- A) 1 pF
- B) 3 pF
- C) 5 pF
- D) 10 pF
26. Which of the following devices can check the condition of a semiconductor diode?
- A) Digital display meter (DDM)
- B) Multimeter
- C) Curve tracer
- D) All of the above
27. What does a high resistance reading in both forward- and reverse-bias directions indicate?
- A) A good diode
- B) An open diode
- C) A shorted diode
- D) A defective ohmmeter
28. The condition of a semiconductor diode can be determined quickly using a _____.
- A) DDM
- B) VOM
- C) curve tracer
- D) Any of the above
29. Determine the nominal voltage for the Zener diode at a temperature of 120° C if the nominal voltage is 5.1 volts at 25° C and the temperature coefficient is 0.05%/° C.
- A) 4.6 V
- B) 4.86 V
- C) 5.1 V
- D) 5.34 V
30. Calculate the temperature coefficient in %/° C of a 10-V nominal Zener diode at 25° C if the nominal voltage is 10.2 V at 100° C.
- A) 0.0238
- B) 0.0251
- C) 0.0267
- D) 0.0321
31. In which of the following color(s) is (are) LEDs presently available?
- A) Yellow
- B) White
- C) Orange
- D) All of the above
32.What is the maximum power rating for LEDs?
- A) 150 mW
- B) 500 mW
- C) 1 W
- D) 10 W
33. In which of the following is the light intensity measured?
- A) Candela
- B) Efficacy
- C) Flux
- D) Illumination
34. What is the range of the operating voltage level for LEDs?
- A) 5–12 mV
- B) 1.7–3.3 V
- C) 5–12 V
- D) 20–25 V
35. In general, LEDs operate at voltage levels from _____ V to _____ V.
- A) 1.0, 3.0
- B) 1.7, 3.3
- C) 0.5, 4.0
- D) None of the above
FILL IN THE BLANK QUESTIONS
1. A(n) _____ is the simplest of semiconductor devices.
- A) diode
- B) transistor
- C) operational amplifier
- D) SCR
2. The term _____ is often used when comparing the resistance level of materials.
- A) permittivity
- B) inductivity
- C) conductivity
- D) resistivity
3. In the atomic lattice the _____ and _____ form the nucleus.
- A) electrons, neutrons
- B) electrons, protons
- C) neutrons, protons
- D) None of the above
4. An increase in temperature of a semiconductor can result in a _____ in the number of free electrons in the material.
- A) substantial increase
- B) substantial decrease
- C) slight decrease
- D) no change
5. Ge and Si have a(n) _____ coefficient in forward bias.
- A) positive temperature
- B) negative temperature
- C) absolute temperature
- D) temperature free
6. Any electron that has left its parent atom has _____ energy state relative to any electron in the atomic structure.
- A) the same
- B) a lower
- C) a higher
- D) an undefined
7. Introducing those impurity elements that have _____ valence electrons creates the n-type material.
- A) 0
- B) 3
- C) 4
- D) 5
8. In n-type material the _____ is called the majority carrier.
- A) electron
- B) hole
- C) proton
- D) neutron
9. The diffused impurities with _____ valence electrons are called acceptor atoms.
- A) 0
- B) 3
- C) 4
- D) 5
10. The reverse-saturation current level is typically measured in _____.
- A) pA
- B) µA
- C) mA
- D) A
11. The depletion width _____ in the forward bias, which results in having a majority flow across the junction.
- A) widens
- B) remains unchanged
- C) shrinks
- D) widens and shrinks alternatively
12. The forward characteristics curve of a diode grows in _____ form.
- A) linear
- B) exponential
- C) logarithmic
- D) sinusoidal
13. The potential at which the characteristics curve vertical rise occurs is commonly referred to as the _____.
- A) offset
- B) threshold
- C) firing potential
- D) All of the above
14. The reverse saturation current Is will just _____ in magnitude for every 10° C increase in temperature.
- A) double
- B) remain the same
- C) halve
- D) triple
15. Diodes are connected _____ to increase the current-carrying capacity.
- A) in series
- B) in parallel
- C) in parallel-series
- D) None of the above
16. The _____ the current through a diode, the _____ the dc resistance level.
- A) higher, lower
- B) lower, lower
- C) lower, higher
- D) higher, higher
17. Varying the _____ can control the location of the Zener region.
- A) forward current
- B) doping levels
- C) forward voltage
- D) dc resistance
18. The test current in a Zener diode IZT is the current defined by the _____ power level.
- A) 0.25
- B) 0.5
- C) 0.75
- D) 1.00
19. The heavier the current in a Zener diode in reverse bias, _____ dynamic resistance value.
- A) the more the
- B) the less the
- C) there is substantially more
- D) there is no change in the
20. The intensity of LED is greatest at _____ degrees and the least at _____ degrees.
- A) 0, 90
- B) 45, 90
- C) 0, 45
- D) 90, 180
21. The temperature coefficient can be _____ for different Zener levels.
- A) positive
- B) negative
- C) zero
- D) All of the above
22. The reverse recovery time of most commercial switching diodes is in the range of _____.
- A) picoseconds
- B) a few nanoseconds
- C) several microseconds
- D) milliseconds
23. The ac resistance of a diode is the _____ of the characteristic curve at the Q-point of operation.
- A) reciprocal of the slope
- B) slope
- C) midpoint
- D) average value
24. Generally the value of ac resistance is _____ the value of dc resistance at the same operating point.
- A) smaller than
- B) larger than
- C) the same as
- D) unrelated to
25. The reverse-bias current _____ with the increase of temperature.
- A) decreases
- B) increases
- C) remains the same
- D) None of the above
Post a Comment
good work. thanks for the questions
EmoticonClick to see the code!
To insert emoticon you must added at least one space before the code.