The size of a transformer core will depend on__________?
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
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The hum in a transformer is mainly attributed to______________?
The hum in a transformer is mainly attributed to______________?
A. load changes
B. oil in the transformer
C. magnetostriction
D. mechanical vibrationsIn an actual transformer the iron loss remains practically constant from no load to full load because:____________?
In an actual transformer the iron loss remains practically constant from no load to full load because:____________?
A. value of transformation ratio remains constant
B. permeability of transformer core remains constant
C. core flux remains practically constant
D. primary voltage remains constant
C. secondary voltage remains constantNegative voltage regulation is indicative that the load is___________?
Negative voltage regulation is indicative that the load is___________?
A. capacitive only
B. inductive only
C. inductive or resistive
D. none of the aboveAn open-circuit test on a transformer is conducted primarily to measure______________?
An open-circuit test on a transformer is conducted primarily to measure______________?
A. insulation resistance
B. copper loss
C. core loss
D. total loss
E. efficiency
F. none of the aboveNoise level test in a transformer is a______________?
Noise level test in a transformer is a______________?
A. special test
B. routine test
C. type test
D. none of the aboveWhich of the following properties is not necessarily desirable for the material for transformer core ?
Which of the following properties is not necessarily desirable for the material for transformer core ?
A. Low hysteresis loss
B. High permeability
C. High thermal conductivity
D. Adequate mechanical strength