Online Electronics and Communication Engineering Test - Electronics and Communication Engineering Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Assertion (A): In ionic dielectrics, P = P_e + P_i.

Reason (R): In ionic crystals, permanent electric dipole moment is zero.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true

[#]

Silicon and germanium have diamond structure. The number of atoms in a volume equal to a³ where a is the edge of elementary cube are

[#]

For an P-N-P transistor in normal operation its junction are biased as

emitter base : reverse, collector base : forward

emitter base : forward, collector base : reverse

emitter base : forward, collector base : forward

emitter base : reverse, collector base : reverse

[#]

An ideal Op-amp is an ideal

voltage controlled current source

voltage controlled voltage source

current controlled current source

current controlled voltage source

[#]

If the iron core of a coil is removed so that it becomes an air cored coil, its inductance

will increase

will decrease

will remain the same

may increase or decrease

[#]

In h parameter representation, the independent variables are

I₁ and V₂

I₂ and V₁

V₁ and V₂

I₁ and I₂

[#]

The two port networks are connected in cascade, the combination is to be represented as a single two-Port network. The parameters of the network are obtained by multiplying the individual matrix

z-parameter

h-parameter

y-parameter

ABCD parameter

[#]

For TE or TM modes of propagation in bounded media, the phase velocity is

independent of frequency

is a linear function of frequency

is a non-linear function of frequency

can be frequency dependent or frequency independent on the source

[#]

If E_y is the voltage applied to Y plates, the vertical deflection of beam is proportional to

E_y

E_y^1.5

E_y²

[#]

10.

In 180° mode of operation of a 3 phase bridge inverter, two thyristors conduct at one time.

True

False

[#]

11.

Which of these commutation methods uses an external pulse for commutation?

Class A

Class C

Class E

Class F

[#]

12.

For dc the current through coupling capacitor in CE amplifier circuit is

very high

high

low

zero

[#]

13.

Assertion (A): Transformer coupling has the disadvantage of the weight of transformer and Saturation of core

Reason (R): Transformer coupling is very suitable for impedance matching

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

[#]

14.

Which of the following values represents the open loop gain of typical op-amp?

100

10000

100000

1000000

[#]

15.

The main advantage of CMOS circuit is

high gain

high output impedance

low power consumption

high gain and high output impedance

[#]

16.

Two numbers in excess-3 code are added and the result is less than 8. To get equivalent binary

0011 is subtracted

0011 is added

0110 is subtracted

0110 is added

[#]

17.

Noise limiter is provided on AM receivers to

reduce interfering noise due to ignition system

reduce noise due to electrical storms

reduce interference due to electrical machinery

all of the above

[#]

18.

If the sign bit of mantissa is 0 and the exponent is increased from a positive to a more negative number the result is

a larger floating point number

a smaller floating point number

either (a) or (b) depending on the actual number

a negative floating point number

[#]

19.

Consider z transform of a signal as given below

then the response will be

IIR

FIR

Depends on value of n

Cannot determined

[#]

20.

The transfer function of a system is

. For a unit-step input to the system the approximate setting time for 2% criterion is :

100 sec

4 sec

1 sec

0.01 sec

[#]

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