Q. In a BJT, what are the three regions called?
A.
Emitter, Base, Collector
B.
Source, Gate, Drain
C.
Anode, Cathode, Gate
D.
Emitter, Collector, Source
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Solution
A BJT consists of three regions: Emitter, Base, and Collector.
Correct Answer:
A
— Emitter, Base, Collector
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Q. In small-signal models, what does the transconductance (gm) represent?
A.
The ratio of output current to input voltage
B.
The ratio of input current to output voltage
C.
The change in output current per change in input voltage
D.
The change in input voltage per change in output current
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Solution
Transconductance (gm) is defined as the change in output current per change in input voltage in small-signal models.
Correct Answer:
C
— The change in output current per change in input voltage
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Q. What is the function of a rectifier in an electronic circuit?
A.
To amplify signals
B.
To convert AC to DC
C.
To filter noise
D.
To switch currents
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Solution
A rectifier converts alternating current (AC) to direct current (DC), which is essential for many electronic devices.
Correct Answer:
B
— To convert AC to DC
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Q. What is the main advantage of using MOSFETs over BJTs?
A.
Higher current gain
B.
Lower power consumption
C.
Better thermal stability
D.
Higher voltage ratings
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Solution
MOSFETs generally have lower power consumption compared to BJTs, making them more efficient in many applications.
Correct Answer:
B
— Lower power consumption
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Q. What is the primary use of a Zener diode?
A.
Rectification
B.
Voltage regulation
C.
Signal amplification
D.
Switching
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Solution
Zener diodes are primarily used for voltage regulation in circuits, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— Voltage regulation
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Q. What type of rectifier allows current to flow in both directions?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
None of the above
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Solution
A rectifier that allows current to flow in both directions does not exist; rectifiers are designed to convert AC to DC.
Correct Answer:
D
— None of the above
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Q. Which of the following is a characteristic of a JFET?
A.
It is voltage-controlled
B.
It is current-controlled
C.
It has a gate current
D.
It operates in the saturation region only
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Solution
A JFET (Junction Field Effect Transistor) is a voltage-controlled device, meaning the output current is controlled by the voltage applied to the gate.
Correct Answer:
A
— It is voltage-controlled
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Q. Which of the following is a characteristic of a MOSFET?
A.
Requires a continuous current to operate
B.
Has a gate that is insulated from the channel
C.
Is always on when powered
D.
Has low input impedance
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Solution
A MOSFET has a gate that is insulated from the channel, allowing for high input impedance.
Correct Answer:
B
— Has a gate that is insulated from the channel
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Q. Which type of FET is known for its high input impedance?
A.
JFET
B.
MOSFET
C.
BJT
D.
IGBT
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Solution
MOSFETs are known for their high input impedance, making them suitable for various applications.
Correct Answer:
B
— MOSFET
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