# RRB JE: Electronics MCQs (Practice_Test 8 of 13)

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A non inverting closed loop op amp circuit generally has a gain factor

Less than one

Greater than one

Of zero

Equal to one

Answer: b

If ground is applied to the ( + ) terminal of an inverting op-amp, the ( — ) terminal will

Not need an input resistor

Be virtual ground

Have high reverse current

Not invert the signal

Answer: b

The closed-loop voltage gain of an inverting amplifier equal to

The ratio of the input resistance to feedback resistance

The open-loop voltage gain

The feedback resistance divided by the input resistance

The input resistance

Answer: c

An ideal OP-AMP is an ideal

Current controlled Current source

Current controlled voltage source

Voltage controlled voltage source

voltage controlled current source

Answer: b

Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5 k and C1 = 0.05 F

1.273kHz

12.73kHz

127.3 kHz

127.3 Hz

Answer: a

How many op-amps are required to implement this equation Vo = V1

4

3

2

1

Answer: d

An OPAMP has a slew rate of 5 V/µS. The largest sine wave O/P voltage possible at a frequency of 1 MHZ is

10 volts

5 volts

5/3 volts

5/2 volts

Answer: d