Q. In a common-emitter BJT configuration, what is the phase relationship between input and output signals?
A.
In phase
B.
Out of phase
C.
No relationship
D.
Depends on frequency
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Solution
In a common-emitter BJT configuration, the output signal is out of phase with the input signal, meaning a positive input results in a negative output.
Correct Answer:
B
— Out of phase
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Q. In small-signal analysis of a BJT, what does the term 'r_pi' represent?
A.
Base resistance
B.
Emitter resistance
C.
Collector resistance
D.
Input resistance
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Solution
In small-signal analysis, 'r_pi' represents the input resistance of the BJT, which is the resistance looking into the base.
Correct Answer:
D
— Input resistance
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Q. In small-signal models, what does the term 'transconductance' (gm) represent?
A.
The ratio of output voltage to input current
B.
The ratio of input voltage to output current
C.
The ratio of output current to input voltage
D.
The ratio of input current to output voltage
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Solution
Transconductance (gm) is defined as the ratio of output current to input voltage in small-signal models.
Correct Answer:
C
— The ratio of output current to input voltage
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Q. What is the effect of temperature on the forward voltage drop of a silicon diode?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
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Solution
The forward voltage drop of a silicon diode decreases with an increase in temperature due to increased carrier activity.
Correct Answer:
B
— Decreases with temperature
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Q. What is the main role of the gate terminal in a MOSFET?
A.
To control the current flow
B.
To provide power supply
C.
To connect to the load
D.
To ground the circuit
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Solution
The gate terminal in a MOSFET controls the current flow between the drain and source terminals.
Correct Answer:
A
— To control the current flow
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Q. What is the typical configuration for an operational amplifier used for voltage amplification?
A.
Inverting
B.
Non-inverting
C.
Differential
D.
All of the above
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Solution
Operational amplifiers can be configured in various ways, including inverting, non-inverting, and differential configurations for voltage amplification.
Correct Answer:
D
— All of the above
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