Q. What is the energy band gap in a semiconductor?
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A.
The energy required to free an electron
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B.
The energy of the conduction band
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C.
The energy of the valence band
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D.
The energy lost in conduction
Solution
The energy band gap is the energy required to free an electron from the valence band to the conduction band.
Correct Answer:
A
— The energy required to free an electron
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Q. What is the function of an operational amplifier (op-amp) in a feedback configuration?
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A.
To increase the input voltage
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B.
To stabilize the output voltage
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C.
To amplify the difference between two input voltages
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D.
To convert AC signals to DC
Solution
An op-amp amplifies the difference between its inverting and non-inverting inputs in a feedback configuration.
Correct Answer:
C
— To amplify the difference between two input voltages
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Q. What is the main function of a zener diode?
-
A.
To rectify AC signals
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B.
To allow current in one direction only
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C.
To provide voltage regulation
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D.
To amplify signals
Solution
A zener diode is designed to allow current to flow in the reverse direction when a specific reverse voltage is reached, providing voltage regulation.
Correct Answer:
C
— To provide voltage regulation
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Q. What is the primary role of a voltage divider in a circuit?
-
A.
To increase voltage
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B.
To decrease voltage
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C.
To isolate components
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D.
To filter signals
Solution
A voltage divider is used to decrease voltage to a desired level by using two resistors.
Correct Answer:
B
— To decrease voltage
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Q. What is the typical configuration for a BJT used as a switch?
-
A.
Common base
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B.
Common collector
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C.
Common emitter
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D.
Common drain
Solution
The common emitter configuration is typically used for BJTs as switches due to its high gain and ability to control large currents.
Correct Answer:
C
— Common emitter
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