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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 copper loss
 both 1and 2

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1/S
 1/(1-S)
 1-S

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 commutation
 generation of voltage
 electromechanical energy conversion

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 not possible
 some what more than 230 V
 230 V
 some what less than 230 V

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
  1960 Watt.
 1920 Watt.

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Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 slip ring induction motor.
 dc shunt motor.
 squirrel cage induction motor.

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MORE MCQ ON Electrical Machines

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