APE Quiz 3

3-phase induction motor will have_________ starting torque and __________starting current.

• High, Low

• Low, High

• High, High

• Low, Low

3-phase induction motor will have__________power factor during no load condition

• High

• Low

• Moderate

• Negative

Which of the following 3-phase induction motor requires external resistor circuit in rotor during starting of the motor:

• Slip-Ring Induction Motor

• Squirrel Cage Induction Motor

What happens when Induction motor runs at synchronous speed, motor will

• Burn

• Stop

• Delivers Real Power

• Delivers reactive power

What determines the speed control of a synchronous motor?

• frequency

• current

• voltage

• rotor construction material

Motor rotation of a three-phase AC induction motor can be reversed by reversing any ________ of the three power supply leads.

• two

• three

• one

• none

What happens if field winding of the synchronous motor is short circuited?

• First, starts as induction motor then run as synchronous motor

• Not start

• Motor will burn out

• Run as induction motor

The speed regulation of a synchronous motor is

• 100%

• 50%

• 25%

• 0%

The method which can be used for the speed control of induction motor from stator side is

• V / f control

• Controlling number of stator poles to control N_s

• Adding rheostats in stator circuit

• All of these

The emf induced in the rotor of an induction motor is proportional to

• Only Voltage applied to stator

• Relative velocity between flux and rotor conductors

• All of them

• Only Slip