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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
0.4
5
25
0.2
0.4
5
25
0.2
Answer
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Related Question
Transformers
A transformer operates poorly at very low frequencies because _____
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Primary reactance is too much increased
Magnetising current is abnormally high
Permeability of core is increased
None of the listed here
Primary reactance is too much increased
Answer
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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?
Breather
Conservator
Horn gaps
Thermal overload relays
Breather
Conservator
Horn gaps
Thermal overload relays
Answer
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Transformers
The approximate efficiency of a large transformer is
65%
95%
50%
80%
65%
95%
50%
80%
Answer
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Transformers
The flux in the core of a single phase transformer is _____
Partly alternating and partly rotating
Purely alternating one
None of the listed here
Purely rotating one
Partly alternating and partly rotating
Purely alternating one
None of the listed here
Purely rotating one
Answer
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Transformers
The primary winding of a power transformer should always be
open
switched
fused
shorted
open
switched
fused
shorted
Answer
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