Communications-Analog Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 6 - 8 of 50

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Question 6

Appeared in Year: 2018

Question MCQ▾

The positive RF peaks of an amplitude modulated voltage rise to a maximum value of 12 V and drop to a minimum value of 4 V. the modulating index () assuming single tone modulation is (December)

Choices

Choice (4)Response

a.

b.

c.

d.

3

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Question 7

Question MCQ▾

Which of the following statement are correct in case of PCM (pulse code modulation) ?

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

2. The quantization noise depends on sampling rate

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

4. If the number of quantization levels increases from 4 to 64, the bandwidth increase by a factor of 4.

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1 and 4 are correct

c.

1 and 3 are correct

d.

2 and 3 are correct

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Question 8

Appeared in Year: 2018

Question Match List-Ⅰ List-Ⅱ▾

Match the two lists and choose the correct answer from the code given below: (December)

List-Ⅰ (Column-I)List-Ⅱ (Column-II)
(A)

Envelope detector

(i)

Optical fiber

(B)

Foster seeley discriminator

(ii)

Microwave

(C)

APD detector

(iii)

FM signal

(D)

PIN detector

(iv)

AM wave

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (ii)
  • (iii)
  • (i)

b.

  • (ii)
  • (iii)
  • (iv)
  • (i)

c.

  • (i)
  • (iii)
  • (iv)
  • (ii)

d.

  • (iv)
  • (iii)
  • (i)
  • (ii)

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