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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  get over heated.
  not run.
  run normally.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.
 using the magnetic core of low reluctance.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
 50 Hz.
  2 Hz.
  3 Hz.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 36.36% increase
 36.36% decrease
 18.18% increase

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Unbalance 3 - Φ stator currents cause

  double frequency currents in the rotor.
All of these
  heating of rotor.
  vibrations.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing terminal voltage.
  increasing armature resistance.
 increasing armature cooling.
  increasing input power of the prime mover.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

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