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

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Total number of questions: 20.
Time allotted: 30 minutes.
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Marks : 2/20

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The real part of complex dielectric constant and tanδ for a dielectric are 2.1 and 5 x 10^-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

1.05 x 10^-3

2.1 x 10^-3

5 x 10^-3

1.05 x 10^-2

[#]

The most important primary force of attraction in the formation of solids is

electromagnetic

electrostatic

quantum-electrostatic

quantum electromagnetic

[#]

What is the effect of cut in voltage on the wave form of output as compared to input in a semiconductor diode?

The duration of output waveform is less than 180°

Output voltage is less than input voltage

Output voltage is more than input voltage

Both (a) and (b)

[#]

In the circuit shown in figure, I_s = 4A, V_s = 4, the voltage V is given by

6 V

8 V

4 V

2 V

[#]

Broadcasting antennas are generally

omnidirectional type

vertical type

horizontal type

helical

[#]

A moving iron instrument gives correct reading when used at

low frequencies

high frequencies

only one frequency

all frequencies upto a certain value

[#]

Assertion (A): Secondary instruments require calibration at frequent intervals.

Reason (R): Secondary instruments have many errors.

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

[#]

In figure what is the base current if V_BE = 0.7 V

10 mA

9.3 mA

10 μA

9.3 μA

[#]

A CE amplifier is the most common BJT amplifier.

True

False

[#]

10.

The r_e model equivalent circuit shown in figure is for

CE amplifier

CC amplifier

CB amplifier

None of the above

[#]

11.

Consider the following statements:

Race around condition can occur in JK flip flop when both inputs are 1
A flip flop is used to store one bit of information
A transparent latch is a D type flip flop
Master slave flip flop is used to store two bits of information

Which of the above are correct?

1, 2, 3

1, 3, 4

1, 2, 4

2, 3, 4

[#]

12.

Out of the following memory types, one that is volatile is

ferrite-core

semiconductor RAM

semiconductor ROM

magnetic disc

[#]

13.

In a digital counter the number of flip-flops is

always 2

always even

always odd

equal to the number of bits required in the final binary count

[#]

14.

For a type 1 system and unit parabolic input, the steady state error is

∞

1/K_v

[#]

15.

A unity feedback system has the following open loop frequency response

The gain margin and phase margin are

0 dB, -17°

3.86 dB, -180°

0 dB, 10°

3.86 dB, 10°

[#]

16.

In the above case if another sine wave corresponding to 40% modulation is transmitted simultaneously, the total radiated power will be

9.9 kW

10.15 kW

10.84 kW

18.4 kW

[#]

17.

The function x(t) is shown in the given figure. Even and odd parts of a unit step function ∪ (t) are respectively,

[#]

18.

Consider the following program segment written for 8085 based system

LXI SP, FFFFH
MVI A, FFH
MOV BB, A
K: DCR B
PUSH HL
JNZ K
INR A
LXI H, FFCEH
CPI 20H
LHLD

The contents of accumulator is :

indeterminate

none of these

[#]

19.

Which of the following devices is used at the first stage of an electronic voltmeter?

BJT

SCR

MOSFET

UJT

[#]

20.

Which of the following is a microwave power amplifier?

Gunn diode

Reflex klystron

Magnetron

Travelling wave tube

[#]

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

Marks : 2/20

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