Op-Amp ( Operational Amplifier )

This is an MCQ-based quiz on Op-Amp ( Operational Amplifier ).

This includes Differential amplifier, Class B push-pull amplifier, CE amplifier, and Swamped amplifier

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When a step-input is given to an OP-amp integrator, the output will be

A ramp A sinusoidal wave A rectangular wave A triangular wave with dc bias

Op-Amp performs which type of mathematical type operations.

Linear Non-linear Frequency-dependent All of the above

What is the full form of Op-Amp?

Operand amplitude Operational Amplifier Operational amplitude None of the above

An ideal op-amp requires infinite bandwidth because ____.

Signals can be amplified without attenuation Output can drive infinite number of device Output voltage occurs simultaneously with input voltage changes Output common-mode noise voltage is zero

The output voltage of the op-amp Vout is given by the equation:

Vout = AOL (V+ * V–) Vout = AOL (V+/ V–) Vout = AOL (V+ + V–) Vout = AOL (V+ – V–)

A certain OP-amp has bias currents of 50 μA. The input offset current is ……..

700 nA

99.3 μA

49.7 μA

None of these

The output of a particular Op-amp increases 8V in 12μs. The slew rate is …….

90 V/μs

0.67 V/μs

1.5 V/μs

None of these

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

Ideal op-amp has infinite voltage gain ___.

To control the output voltage

To obtain finite output voltage

To receive zero noise output voltage

None of the above

With zero volts on both inputs, an OP-amp ideally should have an output ………..

Equal to the positive supply voltage

Equal to the negative supply voltage

Equal to zero

Equal to CMRR

An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed

795mV 395mV 79.5mV 39.5mV

An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is[Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.]

10 volts 5 volts 5/1 volts 5/2 volts

Operational amplifiers use …………..

Linear ICs Digital ICs Both linear and digital ICs None of the above

Which of the following electrical characteristics is not exhibited by an ideal op-amp?

Infinite voltage gain Infinite bandwidth Infinite output resistance Infinite slew rate

How will be the output voltage obtained for an ideal op-amp?

Amplifies the difference between the two input voltages Amplifies individual voltages input voltages Amplifies products of two input voltage None of the mentioned

Find the output voltage of an ideal op-amp. If V1 and V2 are the two input voltages

VO= V1-V2 VO= A×(V1-V2) VO= A×(V1+V2) VO= V1×V2

Find the input voltage of an ideal op-amp. It’s one of the inputs and output voltages are 2v and 12v. (Gain=3)

8v 4v -4v -2v

Which factor determine the output voltage of an op-amp?

Positive saturation Negative saturation Both positive and negative saturation voltage Supply voltage

The common mode gain is ___________

Very high

Very low

Always unity

Unpredictable

Current cannot flow to ground through .