Q. In a BJT, what does the term 'active region' refer to?
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A.
When the transistor is off
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B.
When the transistor is fully on
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C.
When the transistor is used for amplification
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D.
When the transistor is in saturation
Solution
The active region of a BJT is where it can amplify signals, operating between cutoff and saturation.
Correct Answer:
C
— When the transistor is used for amplification
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Q. In semiconductor physics, what are 'holes'?
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A.
Negative charge carriers
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B.
Positive charge carriers
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C.
Neutral particles
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D.
Electrons in the conduction band
Solution
Holes are considered positive charge carriers in a semiconductor, representing the absence of an electron.
Correct Answer:
B
— Positive charge carriers
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Q. In small-signal models, what does the term 'transconductance' refer to?
-
A.
The ratio of output current to input voltage
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B.
The ratio of input current to output voltage
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C.
The gain of the amplifier
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D.
The resistance of the transistor
Solution
Transconductance is defined as the ratio of output current to input voltage in small-signal models.
Correct Answer:
A
— The ratio of output current to input voltage
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Q. What happens to the current in a diode when the reverse voltage exceeds the breakdown voltage?
-
A.
It stops conducting
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B.
It conducts in the reverse direction
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C.
It enters a state of thermal runaway
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D.
It conducts in the forward direction
Solution
When the reverse voltage exceeds the breakdown voltage, the diode conducts in the reverse direction, which can lead to damage if not controlled.
Correct Answer:
B
— It conducts in the reverse direction
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Q. What happens to the drain current in a MOSFET when the gate-source voltage increases?
-
A.
It decreases
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B.
It remains constant
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C.
It increases
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D.
It becomes zero
Solution
As the gate-source voltage increases, the drain current in a MOSFET typically increases, assuming the device is in saturation.
Correct Answer:
C
— It increases
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Q. What is the primary role of the gate in a MOSFET?
-
A.
To control the current flow
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B.
To provide thermal stability
-
C.
To amplify signals
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D.
To rectify AC signals
Solution
The gate of a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the purpose of a rectifier?
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A.
To amplify signals
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B.
To convert AC to DC
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C.
To filter noise
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D.
To switch currents
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 type of rectifier uses a single diode?
-
A.
Full-wave rectifier
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B.
Half-wave rectifier
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C.
Bridge rectifier
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D.
Voltage doubler
Solution
A half-wave rectifier uses a single diode to convert AC to DC by allowing only one half of the AC waveform to pass.
Correct Answer:
B
— Half-wave rectifier
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