For the parallel operation of single phase transformers it is necessary that they should have___________?
A. same efficiency
B. same polarity
C. same kVA rating
D. same number of turns on the secondary side.
Noise level test in a transformer is a______________?
A. special test
B. routine test
C. type test
D. none of the above
The size of a transformer core will depend on__________?
A. frequency
B. area of the core
C. flux density of the core material
D. A. and B. both
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type
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
A common method of cooling a power transformer is_______________?
A. natural air cooling
B. air blast cooling
C. oil cooling
D. any of the above
Material used for construction of transformer core is usually___________________?
A. wood
B. copper
C. aluminium
D. silicon steel