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
Two transformers operating in parallel will the load depending upon their____________?
A. leakage reactance
B. per unit impedance
C. efficiencies
D. ratings
A transformer oil must be free from________________?
A. sludge
B. odour
C. gases
D. moisture
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
What will happen if the transformers working in parallel are not connected with regard to polarity ?
A. The power factor of the two trans-formers will be different from the power factor of common load
B. Incorrect polarity will result in dead short circuit
C. The transformers will not load in proportion to their kVA ratings
D. none of the above
The chemical used in breather is_______________?
A. asbestos fiber
B. silica sand
C. sodium chloride
D. silica gel
Material used for construction of transformer core is usually___________________?
A. wood
B. copper
C. aluminium
D. silicon steel