# Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 50 - 53 of 106

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## Question 50

Communications
Entropy, Mutual Information and Channel Capacity Theorem

Appeared in Year: 2014 (UGC-NET)

### Question

MCQ▾

Arrange the following communication systems in increasing order of their available commercial bandwidth: (June)

1. Satellite Communication System

2. Amplitude Modulated System

3. Frequency Modulated System

4. Two-line transmission system

Correct sequence is

### Choices

Choice (4)Response

a.

4,3, 2,1

b.

1,3, 2,4

c.

4,2, 3,1

d.

1,2, 3,4

## Question 51

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2014 (UGC-NET)

### Question

MCQ▾

What bandwidth is needed for an FM signal that has a peak deviation of ± 3 KHz and handles audio signals from 200 Hz to 5 KHz? (June)

### Choices

Choice (4)Response

a.

6 KHz

b.

16 KHz

c.

10 KHz

d.

9.6 KHz

## Question 52

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2013 (UGC-NET)

### Question

Assertion-Reason▾

### Assertion(Ꭺ)

TDM and FDM accomplish the same end by different means. (September)

### Reason(Ꭱ)

FDM involves simpler instrumentation as compared to TDM.

### Choices

Choice (4)Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

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

## Question 53

Communications
Filtering of Random Signals through LTI Systems

Appeared in Year: 2014 (UGC-NET)

### Question

Match List-Ⅰ List-Ⅱ▾

Match the following lists: (June)

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

Partition Noise

(i)

Resistance

(B)

Shot Noise

(ii)

Triode

(C)

Johnson Noise

(iii)

P-N junction

(D)

Current Noise

(iv)

Diode

### Choices

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

a.

• (iii)
• (ii)
• (i)
• (iv)

b.

• (iii)
• (ii)
• (iv)
• (i)

c.

• (iii)
• (i)
• (ii)
• (iv)

d.

• (ii)
• (iv)
• (i)
• (iii)

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