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Transformers

Transformers
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be

50 W
200 W
100 W
400 W

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Transformers
The path of the magnetic flux in transformer should have

high reluctance
low resistance
high resistance
low reactance

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Transformers
Which motor is preferred for use in mines where explosive gases exist?

Induction motor
Shunt motor
Air motor
Synchronous motor

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Transformers
To step 110 V ac down to 20 V ac, the turns ratio must be

0.18
0.018
5.5
18

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Transformers
Power transformers are generally designed to have maximum efficiency around

half-load
10% overload
near full-load
no-load

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Transformers
We can find _______of the transformer with open circuit test.

Total equivalent resistance
Turn ratio
Total equivalent leakage reactance
Copper losses

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