Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 2
 1 and 3
 2 and 3
 1, 2 and 3

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 cage induction machines and they are essentially the same.
 the former during starting and the latter at a fraction of its rated speed.
 any of the above.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

 Stator mmf wave and resultant mmf wave.
 Stator mmf wave and resultant flux density.
 Rotor mmf wave and resultant flux density wave.
  Rotor mmf wave and stator mmf wave.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines