Physics Questions And Answers :: Feedback Amplifier: part1



Basic Science : Feedback Amplifier QUESTIONS AND ANSWERS :: part1 : 1 to 5

Following Basic Science multiple choice objective type questions and answers will help you in many types of 2014 job and other entrance examinations :

1.In a degenerative feedback amplifier the phase difference between the input signal and feedback signal is

180°
90°
360°

2.The voltage amplification factor of an amplifier without feedback is 20. When a positive feedback is given with a feedback fraction of 0.01, the gain with feedback is

30
25
20
16.7

3.In amplifier, the feedback is positive if

the input of the amplifier is ahead of the voltage fed back by a phase angle of π/4
the input of the amplifier is ahead of the voltage fed back by a phase difference of π/2
the voltage fed back to the input circuit is in phase with the signal voltage
the output of the amplifier is exactly in phase with the voltage fed back to the input

4.The overall gain of a multistage amplifier is 140. When negative feedback is applied, the gain is reduced to 17.5. Then the feedback ratio is

1/10
1/15
1/5
1/20

5.In a feedback amplifier, if the feedback fraction β is positive, then the feedback is

degenerative
regenerative
negative
reverse

More Feedback Amplifier QUESTIONS AND ANSWERS available in next pages

    Health is the greatest gift, contentment is the greatest wealth -Buddha