# Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 9 - 11 of 106

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## Question 9

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

Appeared in Year: 2018 (UGC-NET)

### 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

### Choices

Choice (4)Response

a.

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

b.

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

c.

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

d.

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

## Question 10

Communications
Amplitude Modulation and Demodulation

### 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

## Question 11

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2018 (UGC-NET)

### 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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