Electronic Devices and Circuits Questions & Answers - Page 3

11.

Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C.

Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true but R is not a correct explanation of A

C.

A is true but R is false

D.

A is false but R is true

Correct answer is A

At 20°C, 4 nA, at 30°C, 8 nA, at 40°C, 16 nA, at 50°C, 32 nA.

13.

The types of carriers in a semiconductor are

A.

1

B.

2

C.

3

D.

4

Correct answer is B

Holes and electrons.

14.

In a degenerate n type semiconductor material, the Fermi level

A.

is in valence band

B.

is in conduction band

C.

is at the centre in between valence and conduction bands

D.

is very near valence band

Correct answer is B

This is due to high level of doping.

15.

Secondary emission is always decremental.

A.

True

B.

False

C.

Cannot say

D.

It depends

Correct answer is B

No explanation has been provided for this answer.