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Transformers

Transformers
Which of the following parts of a transformer is visible from outside?

Bushings
Core
Primary winding
Secondary winding

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Transformers
Which motor is preferred for use in mines where explosive gases exist?

Induction motor
Shunt motor
Air motor
Synchronous motor

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Transformers
The short circuit test helps us to find

Iron loss at no load
None of the listed here
Cu loss at any desire load
Cu loss at no load

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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?

0.9 V
9 V
90 V
900 V

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Transformers
If a power transformer is operated at very high frequencies, then ______

Primary will draw large power
None of the listed here
Core losses will be excessive
Primary reactance is too much increased

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Transformers
The all day efficiency of a transformer is ______ the commercial efficiency.

The same as
None of the listed here
More than
Less than

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