Operational Amplifier and Its Applications MCQs

Question 1

Apart from a de power source, the essential requirements of a sawtooth generator are

Accepted Answer

all of the above

Answer

a resistor

Answer

a capacitor

Answer

a switching device

Question 2

Which of the following statement is WRONG? Inn multivibrator.

Accepted Answer

output is available continuously

Answer

feedback between two stages is 100%

Answer

positive feedback is employed

Answer

when one transistor is ON, the other is OFF

Question 3

An MMV circuit

Accepted Answer

returns to its stand-by states automatically

Answer

has no stable state

Answer

gives two output pulses for one input trigger pulse

Answer

has no energy-storage element

Question 4

A BMV circuit

Accepted Answer

has two unstable states

Answer

has on energy-storage element

Answer

switches between its two states automatically

Answer

is not an oscillator

Question 5

In the Schmitt trigger circuit shown in Fig. 6.5 if V cusat) = 0.1 V, the output logic low level (Vod is

Accepted Answer

1.35 V

Answer

1.25 V

Answer

2.50 V

Answer

5.00 V

Question 6

The output stage of a multistage amplifier is also called

Accepted Answer

mixer stage

Answer

power stage

Answer

detector stage

Answer

R.F. stage

Question 7

The op-amp of Fig. 6.7 has a non-invering gain of 101. If R2 = 1 M, value of R1 should be ......... ka.

Accepted Answer

10

Answer

10.1

Answer

100

Answer

101

Question 8

An op-amp when used as a notch filter has a notch frequency = 2 kHz, low-frequency point (3 dB), = 1.8 kHz and high-frequency point = 2.2 kHz. The Q of the notch is

Accepted Answer

5

Answer

0.5

Answer

0.2

Answer

2

Question 9

The maximum efficiency of resistance loaded class A power amplifier is

Accepted Answer

25%

Answer

78.50%

Answer

50%

Answer

30%