# Test: Communication System- 4

## 25 Questions MCQ Test Basic Electronics Engineering for SSC JE (Technical) | Test: Communication System- 4

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Attempt Test: Communication System- 4 | 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 is an indirect way of generating FM

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QUESTION: 4

Which one of the following is an indirect way of generating FM

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QUESTION: 5

Pre-emphasis in FM systems involves

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QUESTION: 6

In FM, modulation index mf is equal to ( Δ f is the frequency deviation, and fm is the modulating signal frequency)

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QUESTION: 7

FM broadcast standards specify a maximum deviation of frequency to be equal to 75 kHz and a maximum modulating frequency of 15 kHz. What is the modulation index for FM wave

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QUESTION: 8

The modulation index of an FM signal, having a carrier swing of 100 kHz with modulation signal frequency of 8 kHz is

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QUESTION: 9

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation is

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QUESTION: 10

In a narrowband FM system, the highest modulating frequency is fm. The bandwidth of the system will be

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QUESTION: 11

The bandwidth of a narrow band FM signal generated by a 4 kHz audio signal modulating a 125 MHz carrier is

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QUESTION: 12

An FM signal with a modulation index 9 is applied to a frequency tripler. The modulation index in the output signal will be

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QUESTION: 13

The ratio W for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is

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QUESTION: 14

With the increase in the transmission bandwidth, received signal-power in AM and FM will,respectively

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QUESTION: 15

In phase modulation, phase deviation is proportional to

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QUESTION: 16

In phase modulation, the frequency deviation is

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QUESTION: 17

Consider an angle modulated signal x(t) = 6 cos[2 π × 106t + 2 sin (8000 π t) + 4cos (8000 π t)VThe average power of x(t) is

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QUESTION: 18

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QUESTION: 19

In a BPSK signal detector, the local oscillator has a fixed phase error of 20º. By what factor does this phase error deteriorate the SNR at the output

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QUESTION: 20

Which one of the following blocks is not common in both AM and FM receivers

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QUESTION: 21

When a radio receiver is tuned to 455 kHz, its local oscillator provides the mixer with an input at 1010 kHz. What is the frequency of the other station

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QUESTION: 22

In conventional AM superheterodyne receivers, the detectors employed to extract intelligence include

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QUESTION: 23

Double spotting in superheterodyne receivers is caused by

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QUESTION: 24

The main advantage of pre-emphasis circuit in FM transmitter is

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QUESTION: 25

The de-emphasis filter in an FM receiver comes

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