Double cage IM

Which of the following is an advantage of a double cage induction motor?

• a) High starting torque

• b) Low starting current

• c) High efficiency

• d) All of the above

The rotor bars of a double cage induction motor are made up of:

• a) Copper

• b) Aluminum

• c) Steel

• d) Carbon

The outer cage of a double cage induction motor has:

• a) More bars and less resistance

• b) More bars and more resistance

• c) Less bars and less resistance

• d) Less bars and more resistance

The inner cage of a double cage induction motor has:

• a) More bars and less resistance

• b) More bars and more resistance

• c) Less bars and less resistance

• d) Less bars and more resistance

The purpose of the inner cage in a double cage induction motor is to:

• a) Increase the starting torque

• b) Increase the slip

• c) Improve the power factor

• d) Reduce the rotor losses

The purpose of the outer cage in a double cage induction motor is to:

• a) Increase the starting torque

• b) Increase the slip

• c) Improve the power factor

• d) Reduce the rotor losses

In a double cage induction motor, the speed at which the maximum torque occurs is:

• a) Synchronous speed

• b) Subsynchronous speed

• c) Supersynchronous speed

• d) None of the above

The starting torque of a double cage induction motor is:

• a) Higher than a squirrel cage motor

• b) Lower than a squirrel cage motor

• c) Same as a squirrel cage motor

• d) Depends on the number of poles

Which type of rotor is more suitable for high starting torque applications?

• a) Squirrel cage rotor

• b) Wound rotor

• c) Double cage rotor

• d) Any of the above

The power factor of a double cage induction motor is:

• a) Higher than a squirrel cage motor

• b) Lower than a squirrel cage motor

• c) Same as a squirrel cage motor

• d) Depends on the number of poles