Diode Circuits MCQs

Question 1

The rms ripple voltage is 20 mV for a 15 V dc output. The percentage ripple factor will be

Accepted Answer

0.13%

Answer

0.01%

Answer

0.07%

Answer

1.30%

Question 2

The dc output voltage is 40 V at full load and 41 V without any load current. The load regulation is

Accepted Answer

2.40%

Answer

0.24%

Answer

0.48%

Answer

0.96%

Question 3

The gate is -5 V and the anode voltage is 500 V. It can be concluded that SCR is

Accepted Answer

OFF

Answer

ON at full load

Answer

ON at part load

Answer

ON at no load

Question 4

For a SCR typical gate trigger voltage is

Accepted Answer

600 V

Answer

0.2 V

Answer

6 V

Answer

60 V

Question 5

The voltage drop across a triac in conduction is about

Accepted Answer

1 mV

Answer

1 gV

Answer

100 V

Question 6

The voltage drop across a SCR in conduction state is about

Accepted Answer

1 V

Answer

100 V

Answer

30 V

Answer

1 gV

Question 7

The breakdown voltage for a diac is of the order of

Accepted Answer

30 V

Answer

0.3 V

Answer

3 V

Answer

300 V

Question 8

On applying reverse bias to a P-N junction diode, it

Accepted Answer

raises the potential barrier

Answer

lowers the potential barrier

Answer

greatly increases the minority-carrier current

Answer

greatly increases the majority-carrier current

Question 9

A full wave rectifier using a capacitor input filter is to supply 100 mA at 300V. (I) The secondary voltage of the transormer must be

Accepted Answer

234-0-234 V

Answer

200-0-200 V

Answer

300-0-300 V

Answer

420-0-420 V