Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 26.21 kW.
 24.11 kW.
 23.06 kW.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a 3 - Φ induction motor

  power factor at starting in the same as that while running.
  none of them.
  power factor at starting is high as compared to that while running.
  power factor at starting is low as compared to that while running.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are

 1, 3, 4, 5
 2, 3, 4
 2, 3, 4, 5
 1, 2, 3, 4 and 5

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines