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Transformers

Transformers
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

88 V
8.8 V
8,800 V
880 V

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Transformers
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

250 W
25 W
2.5 W
0 W

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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are

somewhat smaller
about the same
much smaller
much higher

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Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

0 V
0.75 V
6 V
48 V

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Transformers
The power transformer is a constant

Current device
Power device
Voltage device
Main flux device

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Transformers
The transformer that should never the secondary open circuited when primary is energised is _______

Power transformer
Current transformer
Auto transformer
Voltage transformer

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