A. to provide coupling between primary and secondary
B. to increase the magnitude of mutual flux
C. to decrease the magnitude of mag-netizing current
D. to provide all above features
Transformers
Transformers
A. less will be the secondary induced e.m.f.
B. less will be the primary induced e.m.f.
C. less will be the primary terminal voltage
D. none of the above
A. to provide free passage to the cooling oil
B. to insulate the coils from each other
C. both A. and (b)
D. none of the above
A. has high magnitude and low power factor
B. has high magnitude and high power factor
C. has small magnitude and high power factor
D. has small magnitude and low power factor
A. load on it increases
B. load on it decreases
C. load remains constant
D. none of the above
A. at no load
B. at 50% full load
C. at 80% full load
D. at full load
A. nearly full load
B. 70% full load
C. 50% full load
D. no load
A. 3000 kVA
B. 1000 kVA
C. 500 kVA
D. 250 kVA
A. provide fresh air for cooling the transformer
B. supply cooling oil to transformer in time of need
C. protect the transformer from damage when oil expends due to heating
D. none of the above
A. supply frequency
B. load current
C. power factor of load
D. both B. and (c)
