Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 30 - 34 of 106

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Question 30

Communications
Amplitude, Phase and Frequency Shift Keying (ASK, PSK, FSK)

Appeared in Year: 2013 (UGC-NET)

Question

Assertion-Reason▾

Assertion(Ꭺ)

In FSK, a binary 1 usually produces a higher carrier frequency than a binary 0. (June)

Reason(Ꭱ)

FSK maintains a constant amplitude carrier.

Choices

Choice (4)Response

a.

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

Question 31

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

The pH of human blood is between (June)

Choices

Choice (4)Response

a.

6.5 to 7

b.

7.5 to 8

c.

8 to 9

d.

4.5 to 5

Question 32

Communications
PCM, DPCM, Digital Modulation Schemes

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

Quantizing Noise occurs in

Choices

Choice (4)Response

a.

Time-division multiplexing

b.

Frequency-division multiplexing

c.

Pulse-Code modulation

d.

Pulse width modulation

Question 33

Communications
Amplitude, Phase and Frequency Shift Keying (ASK, PSK, FSK)

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

If a carrier modulated by a digital bit stream had one of the possible phases of 0,90, 180 and 270 degrees then modulation is called

Choices

Choice (4)Response

a.

QPSK

b.

BPSK

c.

FSK

d.

QAM

Question 34

Communications
Circuits for Analog Communications

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

Consider the following cables:

1. Single mode optical fibre cable

2. Multimode optical fibre cable

3. Graded-index optical fibre cable

4. Co-axial cable

The correct sequence in increasing order of data rate is

Choices

Choice (4)Response

a.

1,2, 3,4

b.

4,2, 3,1

c.

1,2, 4,3

d.

4,3, 2,1

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