Top 50 Electronics and Communication Engineering MCQ Questions Pdf

Top 50 Electronics and Communication Engineering MCQ Questions Pdf

Mar 21, 2024, By Meritnotes

Question 1 :

Satellites used for International Communication are known as

Answer: INTELSAT

Question 2 :

Tropospheric scatter communication is used in _____ band.

Answer: UHF

Question 3 :

Semiconductor strain gauges employ the _____ property of doped silicon and germanium.

Answer: piezoresistive

Question 4 :

Electronic counters are used for measuring ______

Answer: linear velocity

Question 5 :

The capacitive transducer has an excellent ______ response.

Answer: frequency

Question 6 :

In an N-type semiconductor the current conduction is by

Answer: free electrons

Question 7 :

Reverse resistance of a diode is of the order of _____ ohms.

Answer: mega

Question 8 :

There is a _____ energy gap between any two permitted energy levels within an atom.s

Answer: forbidden

Question 9 :

The emf induced in a coil rotating in a uniform magnetic field is maximum when the flux linkage by the coil is

Answer: zero

Question 10 :

The opposition to the flow of an alternating current is called the

Answer: impedance

Question 11 :

The electric field inside a perfectly conducting media is _____

Answer: zero

Question 12 :

Long distance short wave radio broadcasting uses _____ wave.

Answer: ionospheric

Question 13 :

_____ can detect the presence of both forward and backward waves in a waveguide.

Answer: Directional coupler

Question 14 :

The waveguide operated below cut-off frequency can be used as

Answer: an attenuator

Question 15 :

An isolator is a _____ port network.

Answer: two

Question 16 :

The doping in a zener diode as compared with an ordinary general purpose junction diode is

Answer: heavy

Question 17 :

The Gunn diode is made from ______

Answer: gallium arsenide

Question 18 :

For a narrowband noise with Gaussian Gradrature components the probability density function of its envelope will be

Answer: Rayleigh

Question 19 :

A fibre optic link has the advantage of greater _____ over a conventional copper wire link.

Answer: bandwidth

Question 20 :

The regulation of a transformer increases with the _____ in leakage flux.

Answer: increase

Question 21 :

The size of air cored transducers in comparison to iron cored transducers is

Answer: larger

Question 22 :

A printed copy of computer output is called the

Answer: hard copy

Question 23 :

Programs for applications are normally written in _____ language.

Answer: high level

Question 24 :

The efficiency of a synchronous motor is ____ than that of an induction motor of same size and output rating.

Answer: more

Question 25 :

In a 3 phase induction motor iron loss in rotor is _____ in comparison to that of a stator.

Answer: negligible

Question 26 :

Steady state time response expression is obtained by the use of a final value

Answer: theorem

Question 27 :

For an overdamped system, damping factor is _____

Answer: more than unity

Question 28 :

The poles of continuous time oscillator are _____

Answer: pure imaginary

Question 29 :

The difference between the actual value and ideal value is known as the system _____

Answer: actuating

Question 30 :

The _____ type construction is employed in large capacity power transformers.

Answer: core

Question 31 :

In right hand rule when thumb points in the direction of flow of current then finger tips will point the direction of _____ of force.

Answer: magnetic lines

Question 32 :

In a dc compound motor the field regulator is provided to control the _____

Answer: flux

Question 33 :

Fading in microwave/transmission in inhomogeneous atmosphere is more severe at ____ frequencies.

Answer: high

Question 34 :

Voltage is a form of _____ energy.

Answer: potential

Question 35 :

Using Norton theorem a circuit can be converted into a _____ source.

Answer: current

Question 36 :

A _____ is not an energy dissipating element.

Answer: pure inductor

Question 37 :

The efficiency is only ______ when maximum power transfer is achieved.

Answer: 50%

Question 38 :

Resistance of carbon filament lamp _____ with the increase in supply voltage.

Answer: decreases

Question 39 :

In a step up transformer, secondary turns are _____ than primary turns.

Answer: more

Question 40 :

The horse power obtained from the motor shaft is called the _____ horse power.

Answer: brake

Question 41 :

For generating PCM, the signal is sampled and converted into ______

Answer: PAM

Question 42 :

In comparison to message bandwidth, the PCM has much ____ bandwidth.

Answer: larger

Question 43 :

The directivity of an ideal directional coupler is ______

Answer: infinity

Question 44 :

When one leg of a parallel circuit gets opened out, the current drawn from the supply will _____

Answer: reduce

Question 45 :

For sharper filtering the filters are to be connected in

Answer: cascade

Question 46 :

A zener diode operates under _____ bias for the application as voltage regulator.

Answer: reverse

Question 47 :

A zener voltage regulator is used for _____ heavy load current/small current/medium load current.

Answer: small load current

Question 48 :

Microwave link repeaters are typically about _____ km apart.

Answer: 50

Question 49 :

______ diode is a transferred electron device.

Answer: Gunn

Question 50 :

Velocity of light travelling in an optical fibre is _____ than by a few percent.

Answer: greater