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  • 1/201 Questions

    Which is the most widely used semiconductor?

    • Copper
    • Germanium
    • Silicon
    • None of the above
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  • 2. 

    To produce a large forward current in a silicon diode, the applied voltage must be greater than

    • 0

    • 0.3 V

    • 0.7 V

    • 1 V

    Correct Answer
    A. 0.7 V
  • 3. 

    How much voltage is there across the second approximation of a silicon diode when it is forward biased? 

    • 0

    • 0.3 V

    • 0.7 V

    • 1 V

    Correct Answer
    A. 0.7 V
  • 4. 

    Definitions are

    • Man made

    • Invented

    • Made up

    • All of the above

    Correct Answer
    A. All of the above
  • 5. 

    Which of the following is approximately equal to room temperature? 

    • 0 degrees C

    • 25 degrees C

    • 50 degrees C

    • 75degrees C

    Correct Answer
    A. 25 degrees C
  • 6. 

    If the base resistor is open, what is the collector current?

    • 0

    • 1 mA

    • 2 mA

    • 10 mA

    Correct Answer
    A. 0
  • 7. 

    Trivatent atoms have howmany valence electrons?

    • 1

    • 3

    • 4

    • 5

    Correct Answer
    A. 3
  • 8. 

    In a step-down transformer, which is larger?

    • Primary voltage

    • Secondary voltage

    • Neither

    • No answer possible

    Correct Answer
    A. Primary voltage
  • 9. 

    The flow of valence electrons to the left means that holes are flowing to the

    • Left

    • Right

    • Either way

    • None of the above

    Correct Answer
    A. Right
  • 10. 

    What is the barrier potential of a silicon diode at room temperature?

    • 0.3 V

    • 0.7 V

    • 1 V

    • 2 mV per degree Celsius

    Correct Answer
    A. 0.7 V
  • 11. 

    If the zener diode in a zener regulator is connected with the wrong polarity, the load voltage will be closest to

    • 0.7 V

    • 10 V

    • 14 V

    • 18 V

    Correct Answer
    A. 0.7 V
  • 12. 

    The current gain of a transistor is defined as the ratio of the collector current to the

    • Base current

    • Emitter current

    • Supply current

    • Collector current

    Correct Answer
    A. Base current
  • 13. 

    With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle? 

    • 0 degrees

    • 90 degrees

    • 180 degrees

    • 360 degrees

    Correct Answer
    A. 180 degrees
  • 14. 

    A cold-solder joint 

    • Shows good soldering technique

    • Usually produces an open

    • Is sometimes useful

    • Always has low resistance

    Correct Answer
    A. Usually produces an open
  • 15. 

    If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage? 

    • 0 V

    • 36 V

    • 60 V

    • 240 V

    Correct Answer
    A. 60 V
  • 16. 

    To display the digit 8 ina seven-segment indicator, 

    • C must be lighted

    • G must be off

    • F must be on

    • All segments must be on

    Correct Answer
    A. All segments must be on
  • 17. 

    What is one important thing transistors do?

    • Amplify weak signals

    • Rectify line voltage

    • Regulate voltage

    • Emit light

    Correct Answer
    A. Amplify weak signals
  • 18. 

    Who invented the first junction transistor?

    • Bell

    • Faraday

    • Marconi

    • Schockley

    Correct Answer
    A. Schockley
  • 19. 

    When a diode is forward-biased, the recombination of free electrons and holes may produce 

    • Heat

    • Light

    • Radiation

    • All of the above

    Correct Answer
    A. All of the above
  • 20. 

    The device associated with voltage-controlled capacitance is a

    • Light-emitting diode

    • Photodiode

    • Varactor diode

    • Zener diode

    Correct Answer
    A. Varactor diode
  • 21. 

    An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? 

    • Doping

    • Free electrons

    • Thermal energy

    • Valence electrons

    Correct Answer
    A. Thermal energy
  • 22. 

    The barrier potential across each silicon depletion layer is 

    • 0

    • 0.3 V

    • 0.7 V

    • 1 V

    Correct Answer
    A. 0.7 V
  • 23. 

    The base of an npn transistor is thin and

    • Heavily doped

    • Lightly doped

    • Metallic

    • Doped by a pentavalent material

    Correct Answer
    A. Lightly doped
  • 24. 

    A circuit with a fixed emitter current is called

    • Base bias

    • Emitter bias

    • Transistor bias

    • Two-supply bias

    Correct Answer
    A. Emitter bias
  • 25. 

    The number of free electrons and holes in an intrinsic semiconductor increases when the temperature

    • Decreases

    • Increases

    • Stays the same

    • None of the above

    Correct Answer
    A. Increases
  • 26. 

    What is the peak load voltage in a full-wave rectifier if the secondary voltage is 20 V rms?

    • 0 V

    • 0.7 V

    • 14.1 V

    • 28.3 V

    Correct Answer
    A. 28.3 V
  • 27. 

    A zener diode 

    • Is a battery

    • Has a constant voltage in the breakdown region

    • Has a barrier potential of 1 V

    • Is forward-biased

    Correct Answer
    A. Has a constant voltage in the breakdown region
  • 28. 

    The diode with a forward voltage drop of approximately 0.25 V is the 

    • Step-recovery diode

    • Schottky diode

    • Back diode

    • Constant-current diode

    Correct Answer
    A. Schottky diode
  • 29. 

    The current gain of a transistor is the ratio of the 

    • Collector current to emitter current

    • Collector current to base current

    • Base current to collector current

    • Emitter current to collector current

    Correct Answer
    A. Collector current to base current
  • 30. 

    Derivations are 

    • Discoveries

    • Inventions

    • Produced by mathematics

    • Always called theorems

    Correct Answer
    A. Produced by mathematics
  • 31. 

    The valence electron of a conductor is also called a

    • Bound electron

    • Free electron

    • Nucleus

    • Proton

    Correct Answer
    A. Free electron
  • 32. 

    Treating a connecting wire as a conductor with zero resistance is an example of the 

    • Ideal approximation

    • Second approximation

    • Higher approximation

    • Exact model

    Correct Answer
    A. Ideal approximation
  • 33. 

    An external voltage source is applied to a p-type semiconductor. If the left end of the crystal is positive, which way do the majority carriers flow?

    • Left

    • Right

    • Neither

    • Impossible to say

    Correct Answer
    A. Right
  • 34. 

    What kind of device is a resistor?

    • Unilateral

    • Linear

    • Nonlinear

    • Bipolar

    Correct Answer
    A. Linear
  • 35. 

    How is a nonconducting diode biased?

    • Forward

    • Inverse

    • Poorly

    • Reverse

    Correct Answer
    A. Reverse
  • 36. 

    With a full-wave rectified voltage across the load resistor, load current flows for what part of a cycle? 

    • 0 degrees

    • 90 degrees

    • 180 degrees

    • 360 degrees

    Correct Answer
    A. 360 degrees
  • 37. 

    A transistor has how many doped regions?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 3
  • 38. 

    The fact that only a few holes are in the base region means the base is 

    • Lightly doped

    • Heavily doped

    • Undoped

    • None of the above

    Correct Answer
    A. Lightly doped
  • 39. 

    A conductor has how many types of flow?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
  • 40. 

    When the diode current is large, the bias is 

    • Forward

    • Inverse

    • Poor

    • Reverse

    Correct Answer
    A. Forward
  • 41. 

    In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the  

    • Base-emitter junction

    • Base-collector junction

    • Collector-base junction

    • Recombination path

    Correct Answer
    A. Base-emitter junction
  • 42. 

    The base-emitter voltage of the second approximation is 

    • 0

    • 0.3 V

    • 0.7 V

    • 1 V

    Correct Answer
    A. 0.7 V
  • 43. 

    One way to short a device is 

    • With a cold-solder joint

    • With a solder bridge

    • By disconnecting it

    • By opening it

    Correct Answer
    A. With a solder bridge
  • 44. 

    Which of the following doesn't fit in the group?

    • Conductor

    • Semiconductor

    • Four valence electrons

    • Crystal structure

    Correct Answer
    A. Conductor
  • 45. 

    Diffusion of free electrons across the junction of an unbiased diode produces 

    • Forward bias

    • Reverse bias

    • Breakdown

    • The depletion layer

    Correct Answer
    A. The depletion layer
  • 46. 

    An open resistor has

    • Infinite current through it

    • Zero voltage across it

    • Infinite voltage across it

    • Zero current through it

    Correct Answer
    A. Zero current through it
  • 47. 

    At room temperature an intrinsic silicon crystal acts approximately like 

    • A battery

    • A conductor

    • An insulator

    • A piece of copper wire

    Correct Answer
    A. An insulator
  • 48. 

    Holes act like

    • Atoms

    • Crystals

    • Negative charges

    • Positive charges

    Correct Answer
    A. Positive charges
  • 49. 

    The second approximation works well when

    • Troubleshooting

    • Load resistance is high

    • Source voltage is high

    • All of the above

    Correct Answer
    A. All of the above

Quiz Review Timeline (Updated): Mar 22, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 03, 2013
    Quiz Created by
    EcE_phoenix
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