3P Induction Motors

A test used to determine the equivalent resistance of an induction motor is _.

In running condition the rotor reactance of a \(3\Phi\) induction motor is proportional to

A change of 5% in the supply voltage of a three-phase induction motor will produce to its torque a change of approximately _______.

To reverse the direction of rotation of a three-phase induction motor, it is necessary to

If the speed of an Induction motor increases, what happens to the rotor frequency?

Slip ring are made of

An induction motor is analogous to

What is the formula for the synchronous speed of a motor?

A double squirrel-cage induction motor has

Slip rings are made of

A 3-phase, 4-pole induction motor with an open circuited rotor is connected to a 400 V, 50 Hz, 3-phase supply. The motor will run at _________ rpm.

If there is an open circuit in the rotor of a slip-ring induction motor,

Three phase induction motor is more suitable than single phase because

To reverse the direction of rotation of a three-phase induction motor, it is necessary to

Which one is a method of stopping an electric motor by momentarily reversing its connection to the supply?

In a three-phase induction motor, copper bars are sometimes placed deep in the rotor. This is done for what reason?

In a wound rotor motor, the rotor winding is wound for a number of poles ____ that of the stator windings.

Which of the following is the primary reason why an induction motor is more preferred than a dc motor?

How do you call the phenomenon in a squirrel cage induction motor showing tendency to run at very low speed?

How can the starting torque of a three-phase induction motor be increased? +