Diode Circuits MCQs

Question 1

Ripple factor is the ratio of value to value

Accepted Answer

r.m.s., D.C.

Answer

r.m.s., peak

Answer

peak, D.C.

Answer

peak, r.m.s.

Question 2

Higher value of ripple factor indicates

Accepted Answer

poor rectification

Answer

r.m.s. value equal to peak value

Answer

ideal rectification

Answer

none of the above

Question 3

The forward region of a semiconductor diode characteristic curve is where diode appears as

Accepted Answer

an ON switch

Answer

high resistance

Answer

and OFF switch

Answer

a capacitor

Question 4

The peak inverse voltage (PIV) is applied across a diode when it is

Accepted Answer

reversed-biased

Answer

forward-biased

Answer

on a heat sink

Answer

ON

Question 5

Which of the following statements is incorrect? Silicon diodes are used in rectifier circuit more abundantly chiefly because

Accepted Answer

their reverse current is much smaller than that of germanium diodes

Answer

they can stand higher temperature than germanium does

Answer

they cost much less than germanium diodes

Answer

their turn-off voltage is nearly half of germanium voltage

Question 6

A zener diode is invariably used with

Accepted Answer

reverse bias

Answer

forward bias

Answer

zero bias

Answer

any of the above

Question 7

A crystal diode is used as a

Accepted Answer

rectifier

Answer

amplifier

Answer

oscillator

Answer

any of the above

Question 8

A zener diode when biased correctly

Accepted Answer

has a constant voltage across it

Answer

never overheats

Answer

acts as a fixed resistance

Answer

has a constant current passing through it

Question 9

Regarding a tunnel diode which of the following statements is incorrect?

Accepted Answer

Its impurity concentration is about 1000 times greater than that of an ordinary junction diode

Answer

Width of its depletion layer is quite large

Answer

It has negative resistance over a specific range of its forward voltage

Answer

Charge carriers are able to tunnel through its depletion layer very easily due to its extremely small thickness