The permissible flux density in case of cold rolled grain oriented steel is around__________?
The permissible flux density in case of cold rolled grain oriented steel is around__________?
A. 1.7 Wb/m2
B. 2.7 Wb/m2
C. 3.7 Wb/m2
D. 4.7 Wb/m2
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The maximum load that a power transformer can carry is limited by its________________?
The maximum load that a power transformer can carry is limited by its________________?
A. temperature rise
B. dielectric strength of oil
C. voltage ratio
D. copper lossThe secondary of a current transformer is always short-circuited under operating conditions because it____________________?
The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the aboveA transformer oil must be free from________________?
A transformer oil must be free from________________?
A. sludge
B. odour
C. gases
D. moistureThe voltage transformation ratio of a transformer is equal to the ratio of_______________?
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 voltageMinimum voltage regulation occurs when the power factor of the load is_____________?
Minimum voltage regulation occurs when the power factor of the load is_____________?
A. unity
B. lagging
C. leading
D. zeroThe noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
A. magnetostrication
B. boo
C. hum
D. zoom