Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 40 - 44 of 106

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Question 40

Communications
Circuits for Analog Communications

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

The Refractive Index of core in optical fibre should be

Choices

Choice (4)Response

a.

Greater than R. I. of cladding

b.

Equal to air

c.

Smaller than R. I. of cladding

d.

Equal to R. I. of cladding

Question 41

Communications
PCM, DPCM, Digital Modulation Schemes

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

The balanced modulator essentially is

Choices

Choice (4)Response

a.

A product modulator

b.

An oscillator

c.

A mixer

d.

An amplifier

Question 42

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

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

Indicate which of the following system is digital?

Choices

Choice (4)Response

a.

Pulse – Width Modulation

b.

Pulse – Position Modulation

c.

Pulse – Amplitude Modulation

d.

Pulse – Code Modulation

Question 43

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2013 (UGC-NET)

Question

Match List-Ⅰ List-Ⅱ▾

Match the following List -i with List-ii

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

Einstein՚s equation

(i)

Law of Conservation of Charge

(B)

Continuity equation

(ii)

Thermal voltage

(C)

Diffusion current

(iii)

Concentration gradient

(D)

Drift current

(iv)

Electric field

Choices

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

a.

  • (i)
  • (iv)
  • (ii)
  • (iii)

b.

  • (i)
  • (ii)
  • (iii)
  • (iv)

c.

  • (iii)
  • (ii)
  • (iv)
  • (i)

d.

  • (iv)
  • (iii)
  • (ii)
  • (i)

Question 44

Communications
Circuits for Analog Communications

Appeared in Year: 2013 (UGC-NET)

Question

MCQ▾

The value of Numerical Aperture in optical fibre is

Choices

Choice (4)Response

a.

Equal to

b.

Less than 1

c.

Greater than 1

d.

Equal to 1

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