Electronic Devices and Circuits Questions & Answers - Page 6

26.

As compared to an ordinary semiconductor diode, a Schottky diode

A.

has higher reverse saturation current

B.

has higher reverse saturation current and higher cut in voltage

C.

has higher reverse saturation current and lower cut in voltage

D.

has lower reverse saturation current and lower cut in voltage

Correct answer is C

This is due to high electron concentration in metals.

27.

Assertion (A): When a high reverse voltage is applied to a p-n junction the diode breaks down.

Reason (R): High reverse voltage causes Avalanche effect.

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

Avalanche breakdown occurs at high reverse voltage.

28.

As compared to an ordinary semiconductor diode, a Schottky diode

A.

has lower cut in voltage

B.

has higher cut in voltage

C.

lower reverse saturation current

D.

both (b) and (c)

Correct answer is A

Cut in voltage in Schottky diode is about 0.3 V as compared to 0.7 V in ordinary semiconductor diode.

30.

Recombination produces new electron-hole pairs

A.

True

B.

False

C.

Cannot say

D.

It depends

Correct answer is B

Due to recombination, the number of electron-hole pairs is reduced.