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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 f²
 V²
 V

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the excitation.
  increasing the input to the prime mover.
 cooling the armature.
  reducing the load voltage.

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Electrical Machines
The crawling in the induction motor is caused by

 harmonics developed in the motor
 improper design of stator laminations
 high loads
 low voltage supply

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 15.28 Nm
 16.55 Nm
 Zero

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 200V
 10V
 100V

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Electrical Machines
In field flux method speed control of DC Motor is

 constant torque drive above the base speed.
 constant power drive above base speed.
 constant torque drive below the base speed.
 constant hp drive below the base speed.

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MORE MCQ ON Electrical Machines

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