6. The overall bandwidth of two identical voltage amplifiers connected in cascade will :
(a) remain the same as that of a single stage
(b) be worse than that of a single stage
(c) be better than that of a single stage
(d) be better if stage gain is low and worse if stage gain is high
7. Negative feedback in an amplifier :
(a) reduces the voltage gain
(b) increases the voltage gain
(c) does not affect the voltage gain
(d) converts the amplifier into an oscillator
8. In a voltage shunt negative feedback amplifier system, the input resistance Ri and the output resistance Ro of the basic amplifier are modified as follows :
(a) Ri is decreased and Ro increased
(b) both Ri and Ro are decreased
(c) both Ri and Ro are increased
(d) Ri is increased and Ro is decreased
9. A radio frequency signal contains three frequency components, 870 KHz, 875 KHz and 880 KHz. The signal needs to be amplified. The amplifier used should be :
(a) audio frequency amplifier
(b) wide band amplifier
(c) tuned voltage amplifier
(d) push-pull amplifier
10. The type of power amplifier which exhibits crossover distortion in its output is :
(a) Class A
(b) Class B
(c) Class AB
(d) Class C
Related Posts
555555555580. Which of the following is (are) the result of gain reduction by a feedback? (a) The amplifier voltage gain is a more stable and precise value. (b) The input impedance of the circuit is increased over that of the op-amp alone. (c) The output impedance is reduced over that of the op-amp alone. (d) All of the above- 5555555555143. With negative feedback, the returning signal (a) is proportional to the output current (b) is proportional to the differential voltage gain (c) opposes the input signal (d) aids the input signal
- 5555555555188. With negative feedback, the returning signal: (a) aids the input signal (b) is proportional to output current (c) opposes the input signal (d) is proportional to differential voltage gain
- Amplifiers » Exercise - 126. When voltage feedback (negative) is applied to an amplifier, its input impedance ....... (a) is decreased (b) is increased (c) remains the same (d) none of the above
- Amplifiers » Exercise - 133. If voltage feedback (negative) is applied to an amplifier, its output impedance ........ (a) remains the same (b) is increased (c) is decreased (d) none of the above