Related Questions

Which of the following is the main advantage of an auto-transformer over a two-winding transformer?
A Eddy losses are totally eliminated
B Copper losses are negligible
C Saving in winding material
D Hysteresis losses are reduced
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A Hysteresis losses are reduced
B Saving in winding material
C Copper losses are negligible
D Eddy losses are totally eliminated
In the transformer following winding has got more cross-sectional area
A Low voltage winding
B High voltage winding
C Primary winding
D Secondary winding
Some wire- wound resistors have bifilar winding. This type of winding is used to
A Increase the thermal stability
B Reduce the tolerance
C Reduce the inductance of winding
D Double the power rating of the resistor
________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
A Direct
B Indirect
C Conventional
D Any of the above
Which winding in a transformer has more number of turns?
A Low voltage winding
B High voltage winding
C Primary winding
D Secondary winding
Primary winding of a transformer
A is always a low voltage winding
B is always a high voltage winding
C could either be a low voltage or high voltage winding
D none of the above
The short circuit in any winding of the transformer is the result of
A mechanical vibration
B insulation failure
C loose connection
D impulse voltage
The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
A One-half the primary current
B Same as the primary current
C Twice the primary current
D No more than 10% less than the primary current
E None of the above
The changes in volume of transformer cooling oil due to variation of atmospheric tem-perature during day and night is taken care of by which part of transformer
A Conservator
B Breather
C Bushings
D Buchholz relay

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