Diode Circuits MCQs

Question 1

A PIN diode is frequency used as a

Accepted Answer

switching diode

Answer

harmonic generator

Answer

peak clipper

Answer

voltage regulator

Question 2

The minimum number of diodes needed for a bridge rectifier is

Accepted Answer

four

Answer

eight

Answer

two

Answer

one

Question 3

The best value of rectification efficiency for a full wave (unfiltered) rectifier could be around

Accepted Answer

80 percent

Answer

50 percent

Answer

65 percent

Answer

95 percent

Question 4

The best value of rectification efficienty for a half wave rectifier could be around

Accepted Answer

40 percent

Answer

55 percent

Answer

80 percent

Answer

95 percent

Question 5

For a half wave rectified sine wave the ripple factor is

Accepted Answer

1.21

Answer

1.65

Answer

1.45

Answer

1

Question 6

The effect used in LED (Light Emitting Diode) is

Accepted Answer

radiative combination

Answer

formation of phonons

Answer

energy transfer from one electron to another when excited electron reverts from conduction band to valence band

Answer

formation of light emission

Question 7

In LED, light is emitted because

Accepted Answer

recombination of charges takes place

Answer

light falls on LED

Answer

diode emits light when heated

Answer

any of the above

Question 8

Which of the following is an active device?

Accepted Answer

SCR

Answer

Electric bulb

Answer

Transformer

Answer

Loudspeaker

Question 9

Which of the following is a passive component?

Accepted Answer

Capacitors

Answer

Vacuum tube devices

Answer

Semiconductor devices

Answer

All of the above