3P Induction Motors

The voltage applied to the stator of a three phase, 4 pole induction motor has a frequency of 50 Hz. The frequency of the emf induced in the rotor is 1.5 Hz. Determine the speed at which motor is running.

In a winding of a \(3\Phi\), 6 pole induction motor, the space angle between two consecutive phases is

If starting voltage of a SCIM is reduced to 50% of its rated vlue, torque developed is reduced by _ percent of its full load value.

The voltage applied to the stator of a three-phase, 4-pole induction motor has a frequency of 50 Hz. The frequency of the emf induced in the rotor is 1.5 Hz. Determine the speed at which motor is running.

The rotor of a 220 v, 60 Hz, 4-pole induction motor has a power input of 80 kW. It is observed that the rotor emf makes 90 cycles per minute, Calculate the rotor copper loss.

For an ac motor, the frequency is 60 Hz and the speed is 300 rpm. What is the number of poles?

If supply voltage is changed by 5% for a 3ɸ induction motor, its torque will have a change of

A three- phase induction motor is taking 40 kW, the slip being 4 , stator losses amount to 800 watts, calculate the total power developed.

At a slip of 4% the maximum possible speed of 3Ø, 60HZ squirrel cage induction motor is

A 220 volt, 10 HP, 60 HZ, three-phase induction motor having four poles is operating at full-load slip of 3%. What is the frequency of the rotor current at full-load?

A three-phase motor is rated 50 HP, 440 volts and 85% power factor. What is the rated current if the motor efficiency is 89%?

What is the speed of an induction motor of four poles if the percent slip is 3%?

Find the rotor frequency of an induction motor having 4 poles if the rotor speed is 1,746 rpm.

A six-pole induction motor is connected to a 60 Hz supply and at full load the rotor emf makes 105 complete cycles in 2 minutes. Find the rotor speed.

A 12-pole, 3- phase alternator driven at a speed of 500 rpm supplies power to an 8-pole, 3-phase induction motor. If the slip of the motor at full-load is 3%, calculate the full-load speed of the motor.

If the stator voltage of a SCIM is reduced to 80% of its rated value, the torque developed is reduced by ____ percent of its full-load value.

A three-phase induction motor has a nameplate speed of 1,720 rpm. What is the rotor frequency?

The frequency of the emf in the stator of a 4-pole induction motor is 60 Hz, and that in the rotor is 2 Hz. At what speed is the motor running?

How much larger is the rotor reactance of a SCIM at start-up than it is when the motor operates at 5 percent slip?

Wye-delta starting is equivalent to autotransformer starting with __________ tapping.