# Test: Communication System- 5

## 25 Questions MCQ Test Basic Electronics Engineering for SSC JE (Technical) | Test: Communication System- 5

Description
Attempt Test: Communication System- 5 | 25 questions in 50 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Basic Electronics Engineering for SSC JE (Technical) for Electrical Engineering (EE) Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

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QUESTION: 3

### Which one of the following statement is correct? The equalizing pulses in television transmission are sent during

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QUESTION: 4

In television, 4 : 3 represents the

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QUESTION: 5

Equalising pulses in TV are sent during

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QUESTION: 6

Ghost in a television picture is due to

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QUESTION: 7

In a PLL

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QUESTION: 8

A PLL can be used to demodulate

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QUESTION: 9

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QUESTION: 10

Which one of the following statements is correct

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QUESTION: 11

An AM signal is detected using an envelope detector. The carrier frequency and modulating signal frequency are 1 MHz and 2 kHz respectively. An appropriate value for the time constant of the envelope detector is

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QUESTION: 12

The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is

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QUESTION: 13

Foster Seeley discriminator is used for

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QUESTION: 14

A message signal m(t) = cos 2000 π t + 4 cos 4000 pt modulates the carrier c(t) = cos 2 π fct where fc = 1 MHz to produce an AM signal. For demodulating the generated AM signal usingan envelope detector, the time constant RC of the detector circuit should satisfy

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QUESTION: 15

The diagonal clipping in amplitude demodulation (using envelope detector) can be avoided if
RC time-constant of the envelope detector satisfies the following condition, (here W is message bandwidth and ωc is) carrier frequency both in rad/sec)

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QUESTION: 16

The choice of the product RC in a simple envelope detector using a diode and an RC circuit is governed by

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QUESTION: 17

It the input is a DSB-SC signal plus noise, what will be noise at the detector

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QUESTION: 18

Which of the following pulse modulation is analog

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QUESTION: 19

Consider the following

1. Pulse-position modulation

2. Pulse-code modulation

3. Pulse-width modulation

Which of these communications are not digital

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QUESTION: 20

Increased pulse-width in the flat-top sampling, leads to

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QUESTION: 21

A PWM signal can be generated by

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QUESTION: 22

A PAM signal can be detected by using

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QUESTION: 23

PAM signals are constructed by using a low pass filter of pass band slightly greater than base band to avoid aliasing. This avoids distortion

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QUESTION: 24

The most noise immune system is

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QUESTION: 25

Which one of the following pairs is not correctly matched

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