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Transformers

Transformers
The primary winding of a power transformer should always be

fused
open
switched
shorted

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Transformers
The approximate efficiency of a large transformer is

50%
95%
65%
80%

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Transformers
The maximum load that a power transformer can carry is limited by its

voltage ratio
copper loss
temperature rise
dielectric strength of oil

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Transformers
A shell-type transformer has

high eddy current losses
negligibly hysteresis losses
None of these
reduced magnetic leakage

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Transformers
A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

78 Ω
13 Ω
7.8 Ω
1.3 Ω

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Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

secondary current to primary current
secondary induced e.m.f. to primary induced e.m.f.
secondary terminal voltage to primary applied voltage
primary turns to secondary turns

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