No-load current of a transformer has
has small magnitude and low power factor
has high magnitude and high power factor
has high magnitude and low power factor
has small magnitude and high power factor
has small magnitude and low power factor
The purpose of providing an iron core in a transformer is to
reduce eddy current losses
decrease the reluctance of the magnetic path
provide support to windings
reduce hysteresis loss
decrease the reluctance of the magnetic path
Which of the following is not a part of transformer installation ?
Exciter
Conservator
Breather
Buchholz relay
Exciter
In a transformer routine efficiency depends upon
power factor of load
load current
supply frequency
both and
both and
In the transformer the function of a conservator is to
provide fresh air for cooling the transformer
supply cooling oil to transformer in time of need
protect the transformer from damage when oil expends due to heating
none of the above
protect the transformer from damage when oil expends due to heating
Natural oil cooling is used for transformers up to a rating of
3000 kVA
250 kVA
500 kVA
1000 kVA
3000 kVA
Power transformers are designed to have maximum efficiency at
nearly full load
50% full load
70% full load
no load
nearly full load
The maximum efficiency of a distribution transformer is
at full load
at 50% full load
at no load
at 80% full load
at 50% full load
While conducting short-circuit test on a transformer the following side is short circuited
Low voltage side
High voltage side
Primary side
Secondary side
Low voltage side
In the transformer following winding has got more cross-sectional area
Secondary winding
Primary winding
High voltage winding
Low voltage winding
Low voltage winding
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