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

Which of the following are the advantages of FM and AM

1. Better noise immunity is provided

2. Lower bandwidth is required

3. The transmitted power is more useful

4. Less modulating power is required

Select the correct answer using the codes given below:

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QUESTION: 2

Why does an FM radio station perform better than an AM station radiating the same total power

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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

Fading is

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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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