TRANSFORMERS QUIZ

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of

15 A

less than 15 A

more than 15 A

None of these

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Natural air cooling is generally restricted for transformers up to

50 MVA

5 MVA

1.5 MVA

15 MVA

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The maximum efficiency of a distribution transformer is

at no load

at 80% full load

at full load

at 50% full load

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Efficiency of a power transformer is of the order of

100 per cent

25 per cent

50 per cent

98 per cent

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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

9 V

900 V

0.9 V

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The steel used for transformer core has

High permeability

Low hysteresis loss

High silicon content

All of the listed here

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In a transformer, leakage flux

Is negligible at full load

Produces mutually induced emf

Is minimised by interleaving the primary and secondary windings

Helps in transfer of energy

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In a transformer the resistance between its primary and secondary is

1000 ohms

Zero

Infinite

1 ohm

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The approximate efficiency of a large transformer is

50%

80%

95%

65%

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What is the approximate efficiency of large transformers?

65%

85%

75%

95 %

TRUE ANSWER : ?
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