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Transformers

Transformers
Burden of a current transformer is usually expressed in

Amperes
Kilowatt
Volt amperes
Volts

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Transformers
Which of the following transformer is smallest?

2kVA, 400 Hz
2kVA, 500 Hz
2kVA, 50 Hz
2kVA, 200 Hz

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Transformers
Which winding in a transformer has more number of turns?

Primary winding
High voltage winding
Low voltage winding
Secondary winding

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Transformers
A step up transformer increases

Power
Current
Voltage
Frequency

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Transformers
The efficiency of a transformer will be maximum when ______

Resistance of the two winding are equal
None of the listed here
Copper loss is equal to constant loss
Leakage reactance of the two winding

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Transformers
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of

15 A
None of these
less than 15 A
more than 15 A

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