GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 385 - 387 of 1076

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Question 385

Appeared in Year: 2016 (UGC-NET)

Question

MCQ▾

Which of the below mentioned statements are correct with respect of semiconductor LASER?

(1) pn-junctions can be formed by using direct bandgap semiconductors.

(2) Emitted radiations should be monochromatic and coherent.

(3) Emitted radiations be monochromatic and all are in same phase.

(4) Emitted radiations should be monochromatic and spontaneous.

Choices

Choice (4)Response

a.

(1) & (2) are correct

b.

(1) , (2) & (4) are correct

c.

(1) , (2) & (3) are correct

d.

(1) , (3) & (4) are correct

Question 386

Appeared in Year: 2016 (UGC-NET)

Question

Match List-Ⅰ List-Ⅱ▾

Match the following lists:

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

A Lag Network

(i)
The Two Part Network Figure Choice A
(B)

A-bridge T filter

(ii)
The Two Part Network Figure Choice B
(C)

A Lead Network

(iii)
The Two Part Network Figure Choice C
(D)

A Lead-Lag Network

(iv)
The Two Part Network Figure Choice D

Choices

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

a.

  • (iii)
  • (iv)
  • (ii)
  • (i)

b.

  • (iii)
  • (i)
  • (ii)
  • (iv)

c.

  • (iv)
  • (iii)
  • (ii)
  • (i)

d.

  • (iii)
  • (i)
  • (iv)
  • (ii)

Question 387

Question

Match List-Ⅰ List-Ⅱ▾

Match the following:

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

Hybrid Mode

(i)

No electric field in the direction of propagation

(B)

TE Mode

(ii)

No electric, no magnetic field in the direction of propagation

(C)

TM Mode

(iii)

No magnetic field in the direction of propagation

(D)

TEM Mode

(iv)

Both electric and magnetic field present in the direction of propagation

Choices

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

a.

  • (iii)
  • (ii)
  • (iv)
  • (i)

b.

  • (iv)
  • (i)
  • (iii)
  • (ii)

c.

  • (iv)
  • (i)
  • (ii)
  • (iii)

d.

  • (iv)
  • (iii)
  • (ii)
  • (i)

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