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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 locking.
 crawling.
 cogging.

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Electrical Machines
Maximum power will be developed when back emf is

All of these
 equal to supply voltage.
 double the supply voltage.
 half of the supply voltage.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
 BYR
 RBY
All of these

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Electrical Machines
Which machine is used for battery charging?

 Compounded DC generator.
 DC series generator.
 DC shunt generator.
 None of these.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.8.
 1.4.
  1.2.
 1.5.

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