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Transformers

Transformers
Which of the following insulating materials can withstand the highest temperature safely?

Mica
Glass fibre
Cellulose
Asbestos

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Transformers
Sumpner's test is conducted on transformer to determine

None of the listed here
All day efficiency
Stray losses
Temperature

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Transformers
The primary and secondary of a transformer are ______ coupled.

None of the listed here
Magnetically
Electrically
Electrically and magnetically

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Transformers
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

111.5 W
0 W
14.1 W
1,020 W

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Transformers
Losses which occur in rotating electric machines and do not occur in trans formers are

hysteresis and eddy current losses
copper losses
friction and windage losses
magnetic losses

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Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

2 V
180 V
20 V
18 V

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