Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 20 - 22 of 106

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Question 20

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2018 (UGC-NET)

Question

MCQ▾

Following are the modulation schemes: (December)

i. AM

ii. FM

iii. DWDM

iv. CWDM

Arrange their adjacent channel band gap in ascending order. The correct sequence is:

Choices

Choice (4)Response

a.

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

b.

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

c.

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

d.

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

Question 21

Communications
Superheterodyne Receivers

Appeared in Year: 2018 (UGC-NET)

Question

MCQ▾

Which of the following statements are correct with reference to super heterodyne receivers? (December)

i. The main advantage of superheterodyne receiver is its better tracking

ii. The main advantage of superheterodyne receiver is improvement in sensitivity

iii. The image channel rejection in superheterodyne receiver comes from IF stages only

iv. The image channel rejection in superheterodyne receiver comes from RF stage only

Choose the correct answer from the code given below:

Choices

Choice (4)Response

a.

(ii) and (iv) are correct

b.

(i) and (iv) are correct

c.

(ii) and (iii) are correct

d.

(i) and (ii) are correct

Question 22

Communications
Timing and Frequency Synchronization

Appeared in Year: 2018 (UGC-NET)

Question

Assertion-Reason▾

Assertion(Ꭺ)

The problem of interference is solved by translating the message signals to different radio frequencies. (December)

Reason(Ꭱ)

The signals from various sources transmitted through open space cause interference and no useful message is passed to the receiver.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is true but Ꭱ is false

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