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TRANSFORMERS

Transformers
Open circuit test on transformers is conducted to determine

core losses
eddy current losses
copper losses
hysteresis losses

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Transformers
Short circuit test on transformers is conducted to determine

core losses
eddy current losses
hysteresis losses
copper losses

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Transformers
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

14.1 W
0 W
111.5 W
1,020 W

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Horn gaps
Thermal overload relays
Breather
Conservator

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Transformers
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

approximately equal to one
great than one
None of these
less than one

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