Blocked rotor test on induction motors is used to find out?

Related Mcqs:

In case the air gap in an induction motor is increased____________?

A. the magnetising current of the rotor will decrease B. the power factor will decrease C. speed of motor will increase D. the windage losses will increase...

If any two phases for an induction motor are interchanged_______?

A. the motor will run in reverse direction B. the motor will run at reduced speed C. the motor will not run D. the motor will burn...

Slip of an induction motor is negative when_____________?

A. magnetic field and rotor rotate in opposite direction B. rotor speed is less than the synchronous speed of the field and are in the same direction C. rotor speed is more than the synchronous speed of the field and are in the same direction D. none of the above...

The stating torque of the slip ring induction motor can be increased by adding__________?

A. external inductance to the rotor B. external resistance to the rotor C. external capacitance to the rotor D. both resistance and inductance to rotor...

Which motor is preferred for use in mines where explosive gases exist ?

A. Air motor B. Induction motor C. D.C. shunt motor D. Synchronous motor...