Practice OP Amp Multiple Choice Questions Quiz-3 - MCQGeeks.com

Q.1

The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k

∞
120k
110k
10k

Q.2

For an OP-amp with negative feedback, the output is .

equal to the input
increased
fed back to the inverting input
fed back to the noninverting input

Q.3

In the above circuit the current ix is

0.6A
0.5A
0.2A
1/12A

Q.4

In differential-mode, ___________

opposite polarity signals are applied to the inputs
the gain is one
the outputs are of different amplitudes
only one supply voltage is used

Q.5

Assume that the OP-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be

Square wave
Triangular wave
Parabolic wave
Sine wave

Q.6

A differential amplifier has a differential gain of 20,000. CMRR=80dB. The common mode gain is given by

2
1
1/2
0

Q.7

The use of negative feedback

reduces the voltage gain of an Op-amp
makes the Op-amp oscillate
makes linear operation possible
A and B both

Q.8

The common mode voltage gain of a differential amplifier is equal to RC divided by

r_e
2r_e
r_e/2
2R_E

Q.9

The differential gain is

very high
very low
dependent on input voltage
about 100

Q.10

When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains

True
False

Q.11

For an ideal OP-amp, which of the following is true?

The differential voltage across the input terminals is zero
The current into the input terminals is zero
The current from output terminal is zero
The output resistance is zero

0 h : 0 m : 1 s