Analog Electronics Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Analog Electronics ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Analog Electronics comprehensively.

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16.
In a transistor leakage current mainly depends on__________?

Doping of base

Size of emitter

Rating of transistor

Temperature

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17.
When a transistor is connected in common emitter mode, it with have__________?

Negligible input resistance and high output resistance

High input resistance and low output resistance

Medium input resistance and high output resistance

Low input resistance as well as output resistance

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18.
In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?

All resistors

All transistors

All inductors

All capacitors

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19.
In an op-amp differentiator:________________?

The amplitude of output is proportional to rate of change of input

The amplitude of output is proportional to input

Output occurs when input is finite and constant

Polarity of input and output is the same

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20.
The early effect in a bipolar junction transistor is caused by_______________?

Fast turn-on

Fast turn-off

Large collector-base reverse bias

Large emitter-base forward bias

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21.
A source follower using an FET usually has a voltage gain which is___________?

Greater than +100

Slightly less than unity but positive

Exactly unity but negative

About -10

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22.
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

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23.
A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?

CMMR

Bandwidth

Slew rate

Open-loop gain

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24.
The effective channel length of a MOSFET in a saturation decreases with increase in___________?

Gate voltage

Drain voltage

Source voltage

Body voltage

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25.
An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?

0.25

0.5

0.75

1

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26.
Class AB operation is often used in power large signal amplifiers in order to_________?

Get maximum efficiency

Remove even harmonics

Overcome a crossover distortion

Reducing collector dissipation

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27.
Negative feedback in an amplifier____________?

Reduces gain

Increase frequency &phase distortion

Reduces bandwidth

Increases noise

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28.
The current gain of a bipolar transistor drops at high frequencies because of____________?

Transistor capacitances

High current effects in the base

Parasitic inductive elements

The early effect

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29.
Generally, the gain of a transistor amplifier falls at high frequencies due to the___________?

Internal Capacitance of the device

Coupling capacitor at the input

Skin effect

Coupling capacitor at the output

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30.
The action of JFET in its equivalent circuit can best be represented as a_____________?

Current controlled Current source

Current controlled voltage source

Voltage controlled voltage source

Voltage controlled current source

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