Test: Communication- 3

QUESTION: 1

The frequency range for satelite communication is

A.
1 kHz to 100 kHz
B.
100 kHz to 10³ kHz.
C.
10 MHz to 30 MHz
D.
1 GHz to 30 GHz.

Solution:

QUESTION: 2

Digital modulation technique are used in ratelite communication system because

A.
They are easier to handle.
B.
large bandwidth utilisation is possible
C.
they have a spectral efficiency
D.
they are less prone to interference

Solution:

QUESTION: 3

In a PLL

A.
capture range = Lock range ¹ free runningfrequency
B.
capture range = Lock rang = free runningfrequency
C.
capture range > lock range.
D.
capture range < lock range.

Solution:

QUESTION: 4

What bandwidth is needed for an FM signal thathas a peak deviation of ± 3 kHz and handleraudio signals from 200 Hz to 5 kHz.

A.
6 kHz
B.
16 kHz
C.
10 kHz
D.
9.6 kHz

Solution:

QUESTION: 5

Main factor that determine the accuracy of areconstructed PCM signal is the

A.
signal bandwidth
B.
pulse repetition rate
C.
pulse amplitude
D.
no. of bits used.

Solution:

QUESTION: 6

Polarization mode dispersion is mainly observedin

A.
multiple step index fiber
B.
single mode fiber
C.
multimode graded index fibre
D.
plastic fiber

Solution:

QUESTION: 7

The spectrum of a band pass signal spans from 20 kHz to 30 kHz. Signal can be recoveredideally from the sampled values when sampling rate is at least

A.
20 kHz
B.
60 kHz
C.
50 kHz
D.
40 kHz

Solution:

QUESTION: 8

The nyquist rate for the signal x(t) = 2 cos ( t) cos (t) in

A.
7 kHz
B.
5 kHz
C.
14 kHz
D.
10 kHz

Solution:

QUESTION: 9

The quantisation noise of a PCM system dependsan

A.
Number of quantisation levels
B.
Step size
C.
both step size and no. of quantisation levels.
D.
sampling rate.

Solution:

QUESTION: 10

Consider the two signals

x₁ = 5 cos ( )

x₂ = 2 cos ( ) cos (t)

The minimum sampling rate is

A.
4 kHz
B.
5 kHz
C.
10 kHz
D.
6 kHz

Solution:

QUESTION: 11

A single mode fibre does not suffer from which type of dispersion

A.
waveguide dispersion
B.
material dispersion
C.
Intermodal dispersion
D.
Polarization dispersion

Solution:

QUESTION: 12

Which of the following mode introduces partition noise ?

A.
Coaxial line
B.
Wave guide
C.
Fibre transmission
D.
both coaxial line and waveguide

Solution:

QUESTION: 13

What was the first commercial geostationarycommunication satelite ?

A.
INTELSAT-1
B.
ECHO
C.
INSAT-1A
D.
SPUTNIK

Solution:

QUESTION: 14

In an optical fiber, the light beam propagator dueto which one of the following ?

A.
Simple reflection of light at a boundarybetween two media.
B.
Refraction of light in medium
C.
Total internal reflection of the boundary
D.
Scattering of light in the medium

Solution:

QUESTION: 15

If the value of a resistor creating thermal noise isdoubled, the noise generated is

A.
halved
B.
doubled
C.
unchanged
D.
slightly changed

Solution:

QUESTION: 16

Which one of the following is an indirect way ofgenerating FM ?

A.
Reactance FET modulator
B.
Varactor diode modulator
C.
Armstrong modulator
D.
Reactance tube modulator

Solution:

QUESTION: 17

Tropospheric scatter communication is used forwhich frequency bond ?

A.
HF
B.
VHF
C.
UHF
D.
VLF

Solution:

QUESTION: 18

Why does an FM radio station perform betterthan AM station radiating the same total power?

A.
FM is immune to noise
B.
AM has only two sideband while FM hasmore
C.
FM user larger bandwidth
D.
Capture effects appear in FM

Solution:

QUESTION: 19

In a PCM system, if we increase the levels from 2 to 8, how do the relative bandwidthrequirement varies ?

A.
Get doubled
B.
Get tripled
C.
Remain same
D.
Become eight times

Solution:

QUESTION: 20

How can quantisation noise be reduced ?

A.
By using de-emphasis
B.
By using RF amplifier in the receiver
C.
By increasing no. of quantisation level
D.
By sending slopping pulses.

Solution:

QUESTION: 21

Light travels along optical fibres by whichmechanism ?

A.
Refraction
B.
Reflection
C.
Scattering
D.
Total internal reflection

Solution:

QUESTION: 22

72. What is the reason for using frequencies of theorder of a few GHz in satelite communication ?

A.
Antenna sizes are small and ionosphere does not reffect frequencies
B.
helical antennas can be used at there frequencies
C.
Frequencies can pass through ionosphere without attenuation.
D.
Easy availability of components at these frequencies.

Solution:

QUESTION: 23

Which one of the following blocks is not commonin both AM ad FM receivers ?

A.
RF amplifier
B.
Mixer
C.
IF amplifier
D.
Slope detector

Solution:

QUESTION: 24

An analog signal has significant spectralcomponents from 1 kHz to 5 kHz. What is theNyquist rate for this signal ?

A.
5 K sampler/sec
B.
4 k sampler per sec.
C.
8 k sampler/sec
D.
10 k sampler/sec

Solution:

QUESTION: 25

A ckt producer an output y(t) = a + b x²(t) wherex(t) is its input. This ckt can produce

A.
Rectified output
B.
pulse modulation
C.
Amplitude modulation
D.
Frequency modulation

Solution:

25 Questions MCQ Test Basic Electronics Engineering for SSC JE (Technical) | Test: Communication- 3

The frequency range for satelite communication is

Digital modulation technique are used in ratelite communication system because

In a PLL

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