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Transformers

Transformers
The power transformer is a constant

Power device
Voltage device
Current device
Main flux device

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Transformers
A step up transformer increases

Voltage
Frequency
Current
Power

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Transformers
In a transformer, leakage flux

Helps in transfer of energy
Is minimised by interleaving the primary and secondary windings
Produces mutually induced emf
Is negligible at full load

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Transformers
A shell-type transformer has

reduced magnetic leakage
negligibly hysteresis losses
None of these
high eddy current losses

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Transformers
Two things which are same for primary and secondary of transformer are ______

None of the listed here
Ampere turns and voltage per turns
Currents and induced voltages
Resistance and leakage reactances

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Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

90 V
0.9 V
900 V
9 V

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