Communication System (NEET Physics): Questions 30 - 35 of 42

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Question number: 30

» Communication System » Bandwidth of Transmission Medium

MCQ▾

Question

In a communication system, noise is most likely to affect the signal

Choices

Choice (4) Response

a.

In the information source I

b.

At the transmitter

c.

In the channel or in the transmission line

d.

None of the above

Question number: 31

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

While tuning in a certain broadcast station with a receiver, we are actually,

Choices

Choice (4) Response

a.

Varying the local oscillator frequency

b.

Tuning the antenna

c.

Varying the frequency of the radio signal to be picked

d.

Question does not provide sufficient data or is vague

Question number: 32

» Communication System » Bandwidth of Transmission Medium

MCQ▾

Question

The characteristic impedance of a coaxial cable is of the order of,

Choices

Choice (4) Response

a.

50Ω

b.

200Ω

c.

270Ω

d.

Question does not provide sufficient data or is vague

Question number: 33

» Communication System » Need for Modulation

MCQ▾

Question

Range of frequencies allotted for commercial FM radio broadcast is,

Choices

Choice (4) Response

a.

88 to 108 kHz

b.

8 to 88 MHz

c.

88 to 108 MHz

d.

88 to 108 GHz

Question number: 34

» Communication System » Need for Modulation

MCQ▾

Question

An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index?

Choices

Choice (4) Response

a.

1.5

b.

0.20

c.

5.0

d.

0.67

Question number: 35

» Communication System » Basic Elements of Communication System

MCQ▾

Question

What should be the maximum acceptance angle at the air core interface of an optical fiber if n 1 and n 2 are the refractive indices of the core and the cladding respectively?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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