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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 less than 90°
 0°
 Greater than 90°
 90°

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 5000 W
 3200 W and 5200 W
 3200 W and 2500 W
 1600 W and 1250 W

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 963.8 r.p.m.
 1037.5 r.p.m.
 1130 r.p.m.
 4575.4 r.p.m.

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Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 1
 infinite value

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 20KVA
 0KVA
 16KVA

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Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
  pulsed wave.
 triangular wave.
 square wave.

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