NTA-NET (Based on NTA-UGC) Electronic Science (Paper-II): Questions 19 - 21 of 132

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Question number: 19

» Networks and Theorems » Transient Analysis

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Appeared in Year: 2018

Match List-Ⅰ List-Ⅱ▾

Question

Match the following:

List-Ⅰ (Column-I) List-Ⅱ (Column-II)

(A)

Am bipolar diffusion constant

(i)

(B)

Constant γ

(ii)

(n + p) DnDp/nDn + pDp

(C)

Am bipolar diffusion constant of the excess carriers

(iii)

(D)

Diffusion constant for holes

(iv)

Choices

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

a.

  • (ii)
  • (iii)
  • (i)
  • (iv)

b.

  • (iii)
  • (ii)
  • (i)
  • (iv)

c.

  • (iii)
  • (iv)
  • (ii)
  • (i)

d.

  • (iv)
  • (i)
  • (ii)
  • (iii)

Question number: 20

» Microwave Communications » Principle of Operation of Magnetron

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Appeared in Year: 2018

MCQ▾

Question

Magnetron is a:

1) O-type tube

2) A low power device

3) A high power device

4) An oscillator

Out of the above, following correct option is: (July)

Choices

Choice (4) Response

a.

1), 3) and 4)

b.

1) and 2)

c.

3) and 4)

d.

2) and 4)

Question number: 21

» Electric Communications » Digital Modulation and Demodulation

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Appeared in Year: 2018

MCQ▾

Question

Which of the following statements are true in the case of Pulse Code Modulation (PCM)?

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

2) The quantization noise depends on sampling rate.

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

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

Choices

Choice (4) Response

a.

1) and 2) are correct

b.

1) and 4) are correct

c.

2) and 3) are correct

d.

1) and 3) are correct

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