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Transformers

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?

900 V
9 V
0.9 V
90 V

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same number of turns on the secondary side.
same efficiency
same polarity
same kVA rating

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Transformers
Which of the following property is not necessarily desirable in the material for transformer core?

High thermal conductivity
Mechanical strength
Low hysteresis loss
High permeability

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Transformers
The hum in a transformer is mainly attributed to

magnetostriction
mechanical vibrations
oil in the transformer
load changes

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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

240 V
12 V
120 V
2,400 V

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Transformers
The efficiency of a transformer will be maximum when ______

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

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