Feedback Amplifiers

Feedback Amplifiers

University

10 Qs

quiz-placeholder

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Feedback Amplifiers

Feedback Amplifiers

Assessment

Quiz

Other

University

Hard

Created by

POORNA VANGARA

Used 25+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The term (1+Aβ) is called as

De-sensitivity

Sensitivity

Loop Gain

None

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is correct with respect to transresistance amplifier?

Output current is proportional to the signal current

Output voltage is proportional to the signal current

Output voltage is proportional to the signal voltage

Output current is proportional to the signal voltage

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The regenerative feedback amplifier overall gain is given by

Af = A/(1+Aβ)

Af = 1-Aβ

Af = A/(1-Aβ)

Af = 1+Aβ

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When current feedback (negative) is applied to an amplifier, its output impedance....

is decreased

is increased

remains the same

none of the above

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If Av and Af are the voltage gains of an amplifier without feedback and with negative feedback respectively, then feedback fraction is...

(1/Av) + (1/Af)

(1/Av) - (1/Af)

(1/Af) - (1/Av)

(Av/Af) - (1/Av)

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The essential conditions for sustained oscillation are

|Aβ|=1 & ∠Aβ=0

|Aβ<1 & ∠Aβ=0

|Aβ|>1 & ∠Aβ=0

|Aβ|<1 & ∠Aβ=180o

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A Hartley oscillator is used for generation of

Very low-frequency oscillation

Radio-frequency oscillation

Microwave oscillation

Audio-frequency oscillation

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