AllInfoHub – MCQ Practice

Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

61. Breakdown voltage of a diode is the reverse voltage at which:
- A. Current starts flowing rapidly
- B. Diode behaves as a short circuit
- C. Diode starts conducting in forward direction
- D. Diode acts as an open circuit
62. The voltage gain of a common emitter amplifier without feedback is typically:
- A. Very high
- B. Very low
- C. Unity
- D. Negative
63. The current gain of a common collector amplifier is typically:
- A. Less than 1
- B. Equal to 1
- C. Greater than 1
- D. Zero
64. The voltage across a fully charged capacitor in a DC circuit is:
- A. Zero
- B. Infinite
- C. Equal to the source voltage
- D. Dependent on the resistance
65. The current through an inductor cannot change instantaneously because of its:
- A. Resistance
- B. Capacitance
- C. Inductance
- D. Reactance
66. Which of the following describes an ideal voltage source?
- A. Zero internal resistance
- B. Infinite internal resistance
- C. Provides constant current
- D. Provides constant power
67. Which of the following describes an ideal current source?
- A. Zero internal resistance
- B. Infinite internal resistance
- C. Provides constant voltage
- D. Provides constant power
68. A phototransistor is a transistor whose operation is controlled by:
- A. Light
- B. Heat
- C. Voltage
- D. Current
69. The minimum current required to keep an SCR in the ON state is called:
- A. Holding current
- B. Latching current
- C. Gate current
- D. Forward current
70. A UJT (Unijunction Transistor) is primarily used in:
- A. Amplifiers
- B. Oscillators
- C. Rectifiers
- D. Filters
71. The negative resistance characteristic is observed in:
- A. BJT
- B. FET
- C. Tunnel diode
- D. Zener diode
72. An optocoupler (or optoisolator) provides electrical isolation between:
- A. Input and output circuits
- B. Two different voltage levels
- C. Two different frequency signals
- D. Digital and analog circuits

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Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

61. Breakdown voltage of a diode is the reverse voltage at which:

62. The voltage gain of a common emitter amplifier without feedback is typically:

63. The current gain of a common collector amplifier is typically:

64. The voltage across a fully charged capacitor in a DC circuit is:

65. The current through an inductor cannot change instantaneously because of its:

66. Which of the following describes an ideal voltage source?

67. Which of the following describes an ideal current source?

68. A phototransistor is a transistor whose operation is controlled by:

69. The minimum current required to keep an SCR in the ON state is called:

70. A UJT (Unijunction Transistor) is primarily used in:

71. The negative resistance characteristic is observed in:

72. An optocoupler (or optoisolator) provides electrical isolation between:

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