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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For a given value (n) of principle quantum number, the number of possible electronic states are

n²

n³

[#]

The units for transconductance are

ohms

amperes

volts

siemens

[#]

The voltage at which Avalanche occurs is known as

cut in voltage

barrier voltage

breakdown voltage

depletion voltage

[#]

At half power frequencies the current in R-L-C series circuit is __________ times current at resonance

1/3

1/4

1/2

[#]

In any network of linear impedances the current flowing at any point equal to algebric sum of currents caused to flow at that point by each of the emf taken separately with all other emfs reduced to zero. The statement represents.

KCL

Norton's theorem

Thevenin's theorem

Superposition theorem

[#]

Assertion (A): Megger is used to check insulation resistance of cables.

Reason (R): Insulation resistance of cables is very high.

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 R is false

A is false R is true

[#]

A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are

100 Hz and 50 Hz

50 Hz and 100 Hz

100 Hz each

50 Hz each

[#]

The no. of comparators required in a 3 bit comparator type ADC is

[#]

The hexadecimal number 'A0' has the decimal value

256

100

160

[#]

10.

Nichol's chart is symmetric about - 180° axis.

True

False

[#]

11.

Noise can be measured by

D.C. voltmeter

A.C. voltmeter

either of the above

none of the above

[#]

12.

The modulation index of an AM wave is changed from 0 to 1. The transmitted power is

unchanged

halved

increased by 50%

quadrupled

[#]

13.

In case of a low level AM transmitter, the amplifier modulated stage must be

class A

class B

class B (linear)

class C

[#]

14.

Assertion (A): Impatt diode is an avalanche diode.

Reason (R): Avalanche breakdown phenomenon occurs when a p-n junction is reverse biased.

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

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

A is correct but R is wrong

A is wrong but R is correct

[#]

15.

If CS = A₁₅ A₁₄ A₁₃ is used as chip select logic of a 4 K RAM in 8085 system, its memory range is

3000 H - 3 FFF H

7000 H - 7 FFFH

5000 H - 5 FFF H and 6000 H - 6 FFF H

6000 H - 6 FFF H and 7000 H - 7 FFF H

[#]

16.

, the coefficient of term e^-t in f(t) will be

0.5

2/3

[#]

17.

If X(a) is the z transform of kx_k, then the z transform of k x_k is

True

False

[#]

18.

If A =

then |A⁵⁰| will be

(1 - 100²)

(1 - 50²)

(1 - 100²)

(1 - 50²)

[#]

19.

Which junction has least junction capacitance?

Alloy

Grown

Diffused

Point contact

[#]

20.

Assertion (A): For same drain current rating N-channel MOSFET occupies more area than p-channel MOSFET.

Reason (R): Electron mobility is much higher than hole mobility.

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

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

A is true but R is false

A is false but R is true

[#]

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