Power transformers are generally designed to have maximum efficiency around__________?
Power transformers are generally designed to have maximum efficiency around__________?
A. no-load
B. half-load
C. near full-load
D. 10% overload
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Which of the following insulating materials can withstand the highest temperature safely ?
Which of the following insulating materials can withstand the highest temperature safely ?
A. Cellulose
B. Asbestos
C. Mica
D. Glass fibreGas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
A. 50°C
B. 80°C
C. 100°C
D. 150°CWhich of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
A. Its secondary current is 5 A
B. Its secondary voltage is 400 V
C. Its rating is 2 kVA
D. Its secondary current is 20 A
E. It is a step-up transformerIf a transformer is continuously operated the maximum temperature rise will occur in_______________?
If a transformer is continuously operated the maximum temperature rise will occur in_______________?
A. core
B. windings
C. tank
D. any 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 aboveThe chemical used in breather for transformer should have the quality of____________?
The chemical used in breather for transformer should have the quality of____________?
A. ionizing air
B. absorbing moisture
C. cleansing the transformer oil
D. cooling the transformer oil