Laboratory exam

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

• Burn

• Stop

• Delivers Real Power

• Delivers reactive power

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

• Squirrel Cage Induction Motor

• Slip Ring Induction Motor

• single phase IM

Direction of rotation of 3-Phase Induction Motor can be reversed by reversing any two phase connections supplying power

• True

• False

Slip of 3-Phase Induction Motor should always be ___

• Less than 1

• Greater than 1

• Equal to 1

• Zero

3-Phase Induction Motor will have ____ Starting Torque and _____ Starting Current

• Low, High

• High, High

• Low, Low

• High, Low

3-Phase Induction Motor is a self starting machine

• True

• False

3-Phase Induction motor will have ____ power factor during no load condition:

• Negative

• Low

• High

• Moderate

Which of the following Induction Motor will have better Starting Torque

• Squirrel Cage Induction Motor

• Slip Ring Induction Motor

Which of the following supply is given to the rotor winding of 3-Phase Induction Motor:

• AC supply

• DC supply

• Pulsating Supply

• No supply

Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor

• Auto-transformer Starter

• Line resistor startling

• Star-Delta Starting

• Rotor Resistance Starting