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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 copper loss
 eddy current loss
 hysteresis loss

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Universal motor.
 Partial motor.
 Slip induction motor.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

  40 A.
 400 A.
 44 A.
 440 A.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under north pole.
 there is no hard and fast rule for this.
 lie under south pole.
 lie in the inter polar gaps.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3600 rpm.
 3000 rpm.
 500 rpm.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of flux.
 opposite to the direction of motion of the conductor.
 direction of motion of the conductor.
 direction of induced emf.

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MORE MCQ ON Electrical Machines

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