Diode Circuits MCQs

Question 1

A tunnel diode is used for

Accepted Answer

microwave frequencies

Answer

very low frequencies

Answer

50 Hz

Answer

HF

Question 2

Which of the following uses two junction of opposite polarities?

Accepted Answer

Varactor diode (d) None of the above

Answer

Tunnel diode

Answer

Zener diode

Question 3

In a power supply a shorted input capacitor is likely to result in

Accepted Answer

no voltage output

Answer

excessive hum

Answer

reduced voltage output

Answer

none of the above

Question 4

Heaters for vacuum tubes normally take a voltage of

Accepted Answer

6.3 V

Answer

1 V

Answer

2.3 V

Answer

220 V

Question 5

The capacitance of a reverse biased PN-junction

Accepted Answer

increases as the reverse bias is de creased

Answer

increases as the reverse bias is increased

Answer

depends mainly on the reverse saturation current

Answer

makes the PN-junction more effective at high frequencies

Question 6

A power supply with a dc outputof 140 V has a 60 Hz ripple of 1.4 V. What is the percentage ripple?

Accepted Answer

1%

Answer

0.10%

Answer

0.14%

Answer

2.40%

Question 7

PN-junction is heavily doped in case of

Accepted Answer

Tunnel diodes

Answer

PIN diodes

Answer

Gundiodes

Answer

All of the above

Question 8

The internal voltage drop in case of vacuum tube diode is of the order of

Accepted Answer

15 to 20 volts

Answer

1 to 2 volts

Answer

2 to 5 volts

Answer

5 to 10 volts

Question 9

The internal voltage drop in case of silicon diodes is around

Accepted Answer

1 to 2 volts

Answer

2 to 5 volts

Answer

5 to 10 volts

Answer

10 to 20 volts