A. lkV
B. 33 kV
C. 100 kV
D. 330 kV
Related Mcqs:
- The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
A. Conservator
B. Breather
C. Bushings
D. Buchholz relay - Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
A. 50°C
B. 80°C
C. 100°C
D. 150°C - 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 - A transformer oil must be free from________________?
A. sludge
B. odour
C. gases
D. moisture - The transformer oil should have _______ volatility and _______ viscosity?
A. low,low
B. high,high
C. low,high
D. high,low - The efficiency of a transformer will be maximum when_____________?
A. copper losses = hysteresis losses
B. hysteresis losses = eddy current losses
C. eddy current losses = copper losses
D. copper losses = iron losses - The no load current in a transformer lags behind the applied voltage by an angle of about_____________?
A. 180°
B. 120″
C. 90°
D. 75° - The main reason for generation of harmonics in a transformer could be_______________?
A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core - If the supply frequency to the transformer is increased,”the iron loss will__________?
A. not change
B. decrease
C. increase
D. any of the above - Part of the transformer which is most subject to damage from overheating is_____________?
A. iron core
B. copper winding
C. winding insulation
D. frame or case
E. transformer tank
