CHOPPER 3

Identify the given circuit

• type D chopper

• Two quadrant type C chopper

• type E chopper

• type F chopper

A type C chopper consists of __________ diodes and _________ switches in anti-parallel.

• 2, 2

• 3, 3

• 4, 4

• 3, 4

What is the duty cycle of a chopper ?

• Ton/Toff

• Toff x Ton

• T/Ton

• Ton/T

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

• IGBT

• MOSFET

• DIODE

• SCR

Variable frequency control is known as

• pulse width modulation

• frequency modulation

• analog modulation

• digital modulation

A type C chopper can operate in

• Ist and IInd quadrants

• IInd and IIIrd quadrants

• Ist, IInd and IIIrd quadrants

• four quadrants

For the first quadrant operation of type E chopper

• Only CH1 is on

• CH1 and CH2 is on

• CH1 and CH3 is on

• CH1 and CH4 is on

For a type E chopper, when CH2 is first on and then switched off then the

• power flows from source to load

• power flows from load to source

• load is short circuited

• none of the mentioned

What is the expression for load voltage when the chopper is operated in the second quadrant?

• Vs

• E

• 0

• E + Ldi/dt

The load emf E must be reversed for

• first and second quadrant operation

• third quadrant operation

• fourth quadrant operation

• both third and fourth quadrant operation