Power Electronics

In the ___________ type of chopper, two stage conversions takes place.

• AC-DC

• AC link

• DC link

• None of the mentioned

Choppers is..................converter

• AC -DC

• DC-AC

• AC-AC

• DC-DC

A chopper may be thought as a

• Inverted with DC input

• DC equivalent of an AC transformer

• Diode rectifier

• DC equivalent of an induction motor

Which device can be used in a chopper circuit?

• BJT

• MOSFET

• GTO

• ALL THE ABOVE

What is the duty cycle of a chopper ?

• Ton/Toff

• Ton/T

• T/Ton

• Toff x Ton

The load voltage of a chopper can be controlled by varying the..................

• duty cycle

• firing angle

• reactor position

• extinction angle

The values of duty cycle (α) lies between..........

• 1<α<100

• 0<=α<=1

• 0>α>-1

• 0<α<1

In a half wave bridge inverter circuit, the power delivered to the load by each source is given by

• 2(Vs x Is)

• Vs x Is

• (Vs x Is)/2

• None of the mentioned

The series-inverter control method is a/an..........

• external frequency control method

• external voltage control method

• internal voltage control method

• none of the mentioned

In case of multiple pulse width modulation method, if the amplitudes of the reference wave and the carrier wave are made equal then, the pulse width =

• 100 °

• ∞

• 0

• none of the mentioned