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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 increase
None of these
 decrease

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 10 volts.
 40 volts.
 20 volts.
 30 volts.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 torque.
 power.
 speed.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 leakage reactance
 per unit impedance
 ratings
 efficiency

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I and P
 V/2, I/2 and P/4
 V, I/2 and P/2
 V/2, I and P/2

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 harmonics developed in the motor
 low voltage supply
 improper design of stator laminations

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