Power Electronic TEST

Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of

• conductor

• semiconductor

• insulator

• diode

what is the meaning of rectification?

• a process of smoothing using a capacitor

• a process of converting an alternating current into a direct current by using a diode.

• a process of converting a direct current into an alternating current by using a diode.

The diagram shown as a process of?

• a half wave rectification

• a full wave rectification

• a full bridge rectification

This is a graph that is seen on CRO. How is it change after full wave rectification process?

• 
• 
• 
• 

is at is diode function?

• is a resistor

• allow current to flow into one direction

• allow current to flow into two direction

• is converting Direct current to AC current

The number of diodes used to build a bridge rectifier?

• 1

• 2

• 3

• 4

The applied input a.c. power to a half-wave rectifier is 100 watts. The d.c. output power obtained is 40 watts. What is the rectification efficiency ?

• 40 %

• 50%

• 60%

• 100%

[15 minutes] What is the duty cycle of a chopper

• Ton/Toff

• TonxToff

• T/Toff

• Ton/T

What is the function of dc chopper

• convert DC to AC

• convert DC to DC

• convert AC to DC

• convert Ac to Ac

The semiconductor devices can be used as a switch in DC chopper except

• diode

• iGBT

• MOSFET

• BJT