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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 induction motor
 AC generator
 DC motor

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 none of above
 shunt field
 armature circuit

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 NnL − NfL.
 (NnL − NfL)/NfL.
 NnL/NfL.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 both 1 and 2
 windage and friction loss
 Copper loss
 core loss only

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 30°.
 60°.
 120°.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with increase in the load torque.
 remains constant.
 decreases with decrease in the load torque.
 increases with increase in the load torque.

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