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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 copper loss.
 eddy current loss.
 both 1 and 2.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 steady and unidirectional
 pulsating and unidirectional
None of these
 oscillating

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

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

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

None of these
 remains unaffected
 increases
 decreases

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 1, 2 and 3
 2 alone
 1 and 3

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Electrical Machines
In synchronous motor the torque is proportional to

 Power P
 1/P²
 P²
 1/P

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