Electronic Devices [GATE (Graduate Aptitude Test in Engineering) Electronics & CE (EC)]: Questions 50 - 52 of 237

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Question 50

Appeared in Year: 2013

Question MCQ▾

A potential difference is developed across a current carrying metal strip when the strip is placed in transverse magnetic field.

2. The Hall Effect is very weak in metals but large in semiconductors.

3. The Hall Effect is very weak in semiconductors but is large in metals.

4. It is applied in the measurement of the magnetic field intensity.

Choices

Choice (4)Response

a.

2 & 4 only

b.

1,2 & 3 only

c.

1,3 & 4 only

d.

None of the above

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Question 51

Appeared in Year: 2013

Question Match List-Ⅰ List-Ⅱ▾

Match the following List -i with List-ii

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

LED

(i)

Rectifier diode

(B)

Tunnel diode

(ii)

Oscillator

(C)

PIN Diode

(iii)

Light emitter

(D)

PN Diode

(iv)

Light detector

Choices

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

a.

  • (i)
  • (iv)
  • (ii)
  • (iii)

b.

  • (i)
  • (ii)
  • (iii)
  • (iv)

c.

  • (iii)
  • (ii)
  • (iv)
  • (i)

d.

  • (ii)
  • (iii)
  • (iv)
  • (i)

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Question 52

Appeared in Year: 2013

Question Assertion-Reason▾

Assertion(Ꭺ)

In optical fibre communication, light rays are guided by the total internal reflection (TIR) at the interface between fibre core and cladding.

Reason(Ꭱ)

The Refractive Index of core is large than the Refractive Index of cladding.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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