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Transformers

Transformers
The highest voltage for transmitting electrical power in india is

33 kV
400 kV
66 kV
132 kV

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Transformers
In which of the following transformer part of primary winding also serves as the secondary winding?

Current transformer
Potential transformer
Auto transformer
Step-up transformer

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Transformers
The eddy current loss in a transformer is directly proportional to _______.

Thickness of core lamination
The supply frequency
Square of thickness of core lamination
The flux density in the core

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Transformers
A transformer operates poorly at very low frequencies because _____

Permeability of core is increased
Magnetising current is abnormally high
Primary reactance is too much increased
None of the listed here

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Transformers
Short circuit test on transformers is conducted to determine

core losses
eddy current losses
copper losses
hysteresis losses

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Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

0 V
48 V
6 V
0.75 V

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