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Transformers
What is the approximate efficiency of large transformers?
95 %
85%
65%
75%
95 %
85%
65%
75%
Answer
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Related Question
Transformers
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of
more than 15 A
None of these
15 A
less than 15 A
more than 15 A
None of these
15 A
less than 15 A
Answer
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Transformers
Primary winding of a transformer
is always a high voltage winding
could either be a low voltage or high voltage winding
is always a low voltage winding
None of these
is always a high voltage winding
could either be a low voltage or high voltage winding
is always a low voltage winding
None of these
Answer
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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
13 Ω
78 Ω
7.8 Ω
1.3 Ω
13 Ω
78 Ω
7.8 Ω
1.3 Ω
Answer
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Transformers
Distribution transformers are generally designed for maximum efficiency around
90% load
50% load
25% load
Zero load
90% load
50% load
25% load
Zero load
Answer
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Transformers
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is
one-fourth the primary current
one-fourth the primary current and equal to the primary current
four times the primary current
equal to the primary current
one-fourth the primary current
one-fourth the primary current and equal to the primary current
four times the primary current
equal to the primary current
Answer
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