Basic Electronics :Part-3 Solved Objective Questions
[1] When the elements of an RLC circuit are both magnitude scaled and frequency scaled, which quality is unaffected?
a. resistor
b. resonant frequency
c. bandwidth
d. quality factor
Ans: D
[2] What kind of filter can be used to select a signal of one particular radio station?
a. low pass
b. high pass
c. band pass
d. band stop
Ans: C
[3] A voltage source supplied a signal of constant amplitude, from 0 to 40kHz, to an RC lowpass filter. The load resistor experiences the maximum voltage at
a. dc
b. 10 kHz
c. 20 kHz
d. 40 kHz
Ans: A
[4] The most commonly used amplifier in sample & hold circuits is
A. A unity gain non-inverting amplifier
B. A unity gain inverting amplifier
C. An inverting amplifier with a gain of 10
D. An inverting amplifier with a gain of 100
Ans: B
[5] Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1K & output resistance of 250,are cascaded. The open circuit voltage gain of combined amplifier is
A. 49dB
B. 51dB
C. 98dB
D. 102dB
Ans: C
[6] The cascade amplifier is a multistage configuration of
A. CC-CB
B. CE-CB
C. CB-CC
D. CE-CC
Ans: B
[7] The current gain of a BJT is
A. gmr0
B. gm/r0
C. gmrπ
D. gm/rπ
Ans: C
[8] Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in
A. Only the temperature
B. Only the β of the transistor
C. Both Temperature & β
D. None of the above
Ans: C
[9] Voltage Series feedback (also called series-shunt feedback) results in
A. Increase in both input & output impedences
B. Decrease in both input & output impedences
C. Increase in input impedence & decrease in output impedence
D. Decrease in input impedence & increase in output impedence
Ans: C
[10] An amplifier without feedback has a voltage gain of a 50,input resistance of 1K & Output resistance of 2.5K. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback of 0.2 is
A. 1/11K
B. 1/5K
C. 5K
D. 11K
Ans: A
a. resistor
b. resonant frequency
c. bandwidth
d. quality factor
Ans: D
[2] What kind of filter can be used to select a signal of one particular radio station?
a. low pass
b. high pass
c. band pass
d. band stop
Ans: C
[3] A voltage source supplied a signal of constant amplitude, from 0 to 40kHz, to an RC lowpass filter. The load resistor experiences the maximum voltage at
a. dc
b. 10 kHz
c. 20 kHz
d. 40 kHz
Ans: A
[4] The most commonly used amplifier in sample & hold circuits is
A. A unity gain non-inverting amplifier
B. A unity gain inverting amplifier
C. An inverting amplifier with a gain of 10
D. An inverting amplifier with a gain of 100
Ans: B
[5] Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1K & output resistance of 250,are cascaded. The open circuit voltage gain of combined amplifier is
A. 49dB
B. 51dB
C. 98dB
D. 102dB
Ans: C
[6] The cascade amplifier is a multistage configuration of
A. CC-CB
B. CE-CB
C. CB-CC
D. CE-CC
Ans: B
[7] The current gain of a BJT is
A. gmr0
B. gm/r0
C. gmrπ
D. gm/rπ
Ans: C
[8] Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in
A. Only the temperature
B. Only the β of the transistor
C. Both Temperature & β
D. None of the above
Ans: C
[9] Voltage Series feedback (also called series-shunt feedback) results in
A. Increase in both input & output impedences
B. Decrease in both input & output impedences
C. Increase in input impedence & decrease in output impedence
D. Decrease in input impedence & increase in output impedence
Ans: C
[10] An amplifier without feedback has a voltage gain of a 50,input resistance of 1K & Output resistance of 2.5K. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback of 0.2 is
A. 1/11K
B. 1/5K
C. 5K
D. 11K
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