Communications-Digital Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 1 - 3 of 38

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Question 1

Appeared in Year: 2018

Question MCQ▾

Which of the following statements are true in the case of Pulse Code Modulation (PCM) ?

1) If the number of bits per sample is increased from n to ; the ratio would be 6dB.

2) The quantization noise depends on sampling rate.

3) The main advantage of PCM is that it possesses better performance in presence of noise.

4) If the number of quantization levels increases from to , the bandwidth increase by a factor of . (July)

Choices

Choice (4)Response

a.

1) and 2) are correct

b.

1) and 4) are correct

c.

2) and 3) are correct

d.

1) and 3) are correct

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Question 2

Appeared in Year: 2018

Question Assertion-Reason▾

Assertion(Ꭺ)

A non-return to zero (NRZ) type digital recording system is more common and efficient. (July)

Reason(Ꭱ)

It is possible to record twice the number of digits for the same number of pulses.

Choices

Choice (4)Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

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Question 3

Appeared in Year: 2018

Question MCQ▾

Arrange in increasing order of Null-to-Null RF bandwidth () of the following binary bandpass signals (December)

i. QPSK

ii. MSK

iii. Sunde՚s FSK

iv. ASK

Choices

Choice (4)Response

a.

(iii) , (iv) , (ii) , (i)

b.

(i) , (ii) , (iv) , (iii)

c.

(iv) , (ii) , (i) , (iii)

d.

(iv) , (i) , (ii) , (iii)

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