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Transformers

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

0.018
5.5
18
0.18

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

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

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Transformers
The highest voltage for transmitting electrical power in india is

132 kV
33 kV
66 kV
400 kV

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Transformers
A transformer transfers electrical energy from primary to secondary usually with a change in ______

Time period
Frequency
Power
Voltage

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Transformers
No-load on a transformer is carried out to determine

magnetising current and loss
copper loss
magnetising current
efficiency of the transformer

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Transformers
The dielectric strength of transformer oil is expected to be

330 kV
lkV
33 kV
100 kV

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