A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increased
Related Mcqs:
- If a transformer is switched on to a voltage more than the rated voltage______________?
A. its power factor will deteriorate
B. its power factor will increase
C. its power factor will remain unaffected
D. its power factor will be zero - For given applied voltage, with the increase in frequency of the applied voltage?
A. eddy current loss will decrease
B. eddy current loss will increase
C. eddy current loss will remain unchanged
D. none of the above - In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?
A. friction and windage losses
B. copper losses
C. hysteresis and eddy current losses
D. none of the above - In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the above - 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 - 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 - The core used in high frequency transformer is usually___________?
A. copper core
B. cost iron core
C. air core
D. mild steel 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 - A transformer can have zero voltage regulation at______________?
A. leading power factor
B. lagging power factor
C. unity power factor
D. zero power factor - The voltage transformation ratio of a transformer is equal to the ratio of_______________?
A. primary turns to secondary turns
B. secondary current to primary current
C. secondary induced e.m.f. to primary induced e.m.f
D. secondary terminal voltage to primary applied voltage
