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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?

 1 V
 2 V
 4 V
 0 V

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 mechanical loss
 hysteresis loss
 eddy-current loss

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 commutator
 armature winding
 starters
 field winding

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 differentially compounded motor
 comulatively compounded motor
 series motor
 permanent magnet motor

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 DC motor.
 variable reluctance motor.
 switched reluctance motor.
 induction motor.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thin
 less and thin
 large and thick

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