NTA-NET (Based on NTA-UGC) Electronic Science (Paper-II): Questions 86 - 88 of 124

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Question number: 86

» Electric Communications » Frequency and Phase Modulation

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Appeared in Year: 2018

MCQ▾

Question

Consider the following systems:

1) Satellite

2) Conventional public address system

3) Conventional radio receiver

4) Laser detector

Arrange the above systems in the order of their increasing order of operational frequency: (July)

Choices

Choice (4) Response

a.

2), 3), 1), 4)

b.

2), 3), 4), 1)

c.

3), 2), 1), 4)

d.

1), 2), 3), 4)

Question number: 87

» Electric Communications » Codes and Modems

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Appeared in Year: 2018

Assertion-Reason▾

Question

Assertion (Ꭺ)

Lesser number of bits per code are required due to less number of quantization levels in DPCM. (July)

Reason (Ꭱ)

In this case, the difference between two successive samples is quantized which do not differ much in amplitude.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 88

» Optical Communication » Modes

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Appeared in Year: 2018

Assertion-Reason▾

Question

Assertion (Ꭺ)

The diameter of SMF is selected in such a way that the single fundamental ray travels straight along the axis of the core of the filter. (July)

Reason (Ꭱ)

The diameter of core SMF is more than and outer diameter is less than .

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true