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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 4 V
 0 V
 1 V

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Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Shunt motor
 Series motor
 Differential compound motor

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and short circuit tests.
 short circuit and slip tests.
 open circuit and zero power factor tests.
 zero power factor and slip tests.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 transformer insulating oil.
 steel core in transformer.
 winding of transformer.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the motor may not start.
 the starting torque becomes low.
 the motor may run away.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Squirrel cage induction motor.
 Same in both induction motors.
None of these
 Slip ring induction motor.

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