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Transformers

Transformers
A transformer oil must be free from

Gases
Odour
Moisture
Sludge

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Transformers
A transformer is an efficient device because it _______

Uses inductive coupling
Uses electric coupling
Uses capacitive coupling
Is a static device

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Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

25
0.2
0.4
5

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Transformers
In a transformer the resistance between its primary and secondary is

Zero
1000 ohms
Infinite
1 ohm

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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?

9 V
0.9 V
90 V
900 V

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Transformers
Which type of winding is used in 3phase shell-type transformer?

Rectangular type
Circular type
Sandwich type
Cylindrical type

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