Diode Circuits MCQs

Question 1

The basic reason why a FW rectifier has twice the efficiency of a HW rectifier is that

Accepted Answer

it utilizes both half-cycle of the input

Answer

it makes use of a transformer

Answer

its ripple factor is much less

Answer

its output frequency is double the line frequency.

Question 2

The output of a half-wave rectifier is suitable only for

Accepted Answer

running ac motors

Answer

running car radios

Answer

charging batteries

Answer

running tape-recorders

Question 3

The ripple factor of a bridge rectifier is

Accepted Answer

1.21

Answer

0.406

Answer

0.812

Answer

1.11

Question 4

The PIV of a half0wave rectifier circuit with a shunt capacitor filter is

Accepted Answer

2 Vsm

Answer

Vsm

Answer

Vsm/2

Answer

3 Vsm

Question 5

The primary function of a rectifier filter is to

Accepted Answer

remove ripples from the rectified output

Answer

minimise ac input variations

Answer

suppress odd harmonics in the rectifier output

Answer

stabilise dc level of th output voltage

Question 6

In a rectifier, larger the value of shunt capacitor filter

Accepted Answer

larger the peak current in the recti-fying diode

Answer

larger the p-p value of ripple voltage

Answer

longer the time that current pulse flows through the diode

Answer

smaller the dc voltage across the load

Question 7

Which rectifier requires four diodes?

Accepted Answer

full wave bridge circuit

Answer

half-wave voltage doubler

Answer

full-wave voltage doubler

Answer

voltage quadrupler

Question 8

In a LC filter, the ripple factor,

Accepted Answer

remains constant with the load current

Answer

increases with the load current

Answer

increases with the load resistance

Answer

has the lowest value

Question 9

The main reason why a bleeder resistor is used in a cIC power supply is that it

Accepted Answer

improves voltage regulation

Answer

keeps the supply ON

Answer

improves filtering action

Answer

both (b) and (c)