1. . If the feedback signal is in-phase with the input signal, it is called
(A) Positive feedback
(B) Negative feedback
(C) Regenerative feedback
(D) Both a and c
2. . In oscillator circuit ________ feedback is used
(A) Positive
(B) Negative
(C) Degenerative
(D) None of the above
3. . In negative feedback the amplifier gain is
(A) Maximum
(B) Minimum
(C) Zero
(D) Infinity
4. . In amplifier the feedback is provided to the
(A) Output
(B) Input
(C) Both a and b
(D) None of the above
5. . The negative feedback is also called ________ feedback
(A) Direct
(B) Regenerative
(C) Degenerative
(D) None of above
6. . Which feedback is used to stabilize the gain of amplifier
(A) Positive
(B) Negative
(C) Regenerative
(D) Both a and c
7. . In an amplifier the difference of 3dB frequencies are
(A) Gain
(B) Distortion
(C) Bandwidth
(D) Feedback
8. . In an amplifier feedback helps out
(A) To minimize impedance
(B) To control amplifier output
(C) To increase gain
(D) To increase distortion/noise
9. . Positive feedback is also called ________ feedback
(A) Direct
(B) Regenerative
(C) Degenerative
(D) Both a and c
10. . In voltage series feedback the input impedance is
(A) Decreased
(B) Increased
(C) Remains unchanged
(D) None of the above
11. . The output impedance of emitter follower is
(A) High
(B) Very high
(C) Almost zero
(D) Low
12. . The value of negative feedback fraction is always
(A) Less than 1
(B) More than 1
(C) Equal to 1
(D) None of the above
13. . A feedback circuit usually employs ________ network
(A) Resistive
(B) Capacitive
(C) Inductive
(D) None of the above
14. . Negative feedback is used in
(A) Oscillators
(B) Rectifiers
(C) Amplifiers
(D) None of the above
15. . Emitter follower circuit is used for
(A) Current gain
(B) Impedance matching
(C) Voltage gain
(D) None of the above