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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 hysteresis loss.
 eddy current loss.
 copper loss.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 6 KVA
 10 KVA
 4 KVA

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 run at very low speed.
 start haunting.
 burn.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 940 rpm
 975 rpm
 950 rpm

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 four.
 three.
 two.

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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?

 BYR
 RBY
All of these
 BRY

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