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

Related Mcqs:

The frame of an induction motor is usually made of____________?

A. silicon steel B. cast iron C. aluminium D. bronze...

The injected e.m.f. in the rotor of induction motor must have__________?

A. zero frequency B. the same frequency as the slip frequency C. the same phase as the rotor e.m.f. D. high value for the satisfactory speed control...

The maximum torque in an induction motor depends on___________?

A. frequency B. rotor inductive reactance C. square of supply voltage D. all of the above...

A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?

A. will continue running burning its one phase B. will continue running burning its two phases C. will stop and carry heavy current causing permanent damage to its winding D. will continue running without any harm to the winding...

In a three-phase induction motor_______________?

A. iron losses in stator will be negligible as compared to that in rotor B. iron losses in motor will be neg¬ligible as compared to that in rotor C. iron losses in stator will be less than that in rotor D. iron losses in stator will be more than that in rotor...