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Transformers

Transformers
A transformer will have zero efficiency at

Full load
Half full load
No load
None of the listed here

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Transformers
To step 110 V ac down to 20 V ac, the turns ratio must be

0.018
5.5
0.18
18

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

Synchronous motor
Air motor
Induction motor
Shunt motor

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Transformers
Harmonics in transformer result in

All of the listed here
magnetic interference with communication circuits
increased I2R losses
increased core losses

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Transformers
Which of the following protection is normally not provided on small distribution transformers?

All of these
Overfluxing protection
Buchholz relay
Overcurrent protection

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Transformers
The turns ratio required to match an 80 source to a 320 load is

2
80
20
4

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