APE Quiz 2

PWM in voltage source inverter can control ----------------------- of the voltage output ?

• Frequency

• Magnitude

• Both Frequency & Magnitude

• None

Which device can be used in a chopper circuit?

• GTO

• IGBT

• MOSFET

• ALL

The controlling parameter in IGBT is the......

• I_G

• V_GS

• I_D

• V_GE

Which of the following application need frequent starting and stopping of electric motors?

• Paper mills

• Grinding mills

• Air-conditioners

• Lifts and hoists

Which of the following machines has heavy fluctuation of load ?

• Printing machine

• Punching machine

• Planer

• Lathe

What is the percentage slip of a motor at full load speed where the nameplate details are: f= 50Hz, poles = 4, full load speed = 1440 rpm?

• s = 3%

• s = 4%

• s = 5%

• s = 6%

At what speed a three-phase two-pole synchronous motor rotates when connected to a 50 Hz system?

• 1000 rpm

• 1500 rpm

• 3000 rpm

• 6000 rpm

Mention the two types of rotor available in Induction Motor

• Salient pole

• Cylindrical

• Squirrel Cage

• Wound Rotor

Which type of rotor of a synchronous motor usually has a large no of poles?

• Salient pole

• Cylindrical pole

• Squirrel cage pole

• Wound pole

Which answer is correct to explain the operation of Synchronous Motor

• The rotating magnetic field & the rotor rotate at the same speed

• The rotating magnetic field speed is faster than rotation of rotor

• The rotating of rotor is faster than magnetic field speed

• The rotor rotate when current induced at rotor.