SSD Unit 2 & 3

Which of the following devices should be used as a switch for high power and high voltage application?

• a)TRIAC

• b)Thyristor

• c)GTO

• d) MOSFET

A four quadrant chopper cannot be operated as

• a)One quadrant chopper

• b)Cyclo converter

• c)Inverter

• d)Bidirectional rectifier

A two quadrant DC to DC chopper can operate with which of the following load conditions?

• a) +Ve voltage ,+Ve current

• b) –Ve voltage ,+Ve current

• c) –Ve Voltage,-Ve Current

• d)+Ve voltage ,_Ve current

For the high frequency choppers, the device that is preferred is

• a) Triac

• b)Thyristor

• c)Transistor

• d)GTO

Which is the most efficient way of controlling a DC shunt motor below rated speed

• a)Armature resistance control

• b) Armature Voltage control

• c) Field resistance control

• d)Diverter resistance control in field circuit

In which of the following control methods, the no load speed of a DC motor can be increased beyond rated value.

• a)Armature resistance control

• b) Armature Voltage control

• c) Field resistance control

• d) Controlling resistance in parallel with armature

Which braking method is the best method for obtaining high braking torque?

• a) Plugging

• b) Regenerative braking

• c) Rheostatic braking

• d) Dynamic braking

 DC shunt motors are used where the high _________ is required.

• a) Breakdown torque

• b) Starting torque

• c) Maximum torque

• d) Minimum torque

Which of the following motor can be referred as a universal motor?

• a) Permanent magnet motor

• b) DC shunt motor

• c) DC series motor

• d) DC compound motor

Which of the following device is NOT suitable for parallel operation?

• a)BJT

• b)MOSFET

• c)TRIAC

• d) IGBT