INDUSTRIAL DRIVES (Unit-1)_Introduction to Electric Drives

To control the speed of motor, electric __________ is used.

• drive
• converter
• starter
• traction

Chopper is used in electric drive as

• sensing unit
• power source
• modulator
• none

Maintance of DC motor is ___________ than AC motor.

• more
• less
• equal
• none

V/F speed control method is used in __________ drives.

• DC
• AC
• both A and B
• none

VFD use only ___________ type of motor.

• AC
• DC
• both A and B
• none

Power modulator in electric drive is

• inverter
• chopper
• rectifier
• all the above

In four quadrant DC diagram, 1st quadrant shows

• forward motoring
• reverse motoring
• forward braking
• reverse braking

In four quadrant DC diagram, 2nd quadrant shows

• forward motoring
• reverse motoring
• forward braking
• reverse braking

In four quadrant DC diagram, 3rd quadrant shows

• forward motoring
• reverse motoring
• forward braking
• reverse braking

Usually VSD uses _________ type motor.

• AC
• DC
• both A and B
• none