CHOPPER_5

The load commutated chopper circuit consists of

• two thyristors and one commutating capacitor

• four thyristors and one commutating capacitor

• two thyristors and two commutating capacitors

• four thyristors and two commutating capacitors

What is the expression for peak capacitor voltage in case of a current commutated chopper circuit.

• Io √(L/C)

• Vs + √(L/C)

• Vs + Io √(L/C)

• Zero

Which type of commutating circuit will have highest switching losses for same rating of all the components?

• current commutated chopper

• voltage commutated chopper

• load commutated chopper

• forced commutated chopper

In current commutated DC-DC choppers, the voltage spike appears across the load when

• Voltage across the commutating inductances collapses

• The capacitance voltage adds to the supply voltage

• Both (a) and (b)

Voltage commutation circuit can be converted into a current commutation by interchanging the positions of

• Diode and capacitor

• Capacitor and SCR

• Inductor and capacitor

• Capacitor and load

In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are

• AC - DC

• DC - DC

• DC - AC

• All of these

Identify the circuit

• Voltage commutated chopper

• current commutated chopper

• morgan chopper

• jones chopper

Saturable reactor core has high impedance when desaturated?

• true

• false

whic of the chopper is ideal for DC motor speed control?

• Jones Chopper

• Morgan Chopper

• Class E chopper

• Class D chopper