If the supply frequency to the transformer is increased,”the iron loss will__________?
If the supply frequency to the transformer is increased,”the iron loss will__________?
A. not change
B. decrease
C. increase
D. any of the above
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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?
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 transformerThe power transformer is a constant______________?
The power transformer is a constant______________?
A. voltage device
B. current device
C. power device
D. main flux deviceSumpner’s test is conducted on transformers to determine_____________?
Sumpner’s test is conducted on transformers to determine_____________?
A. temperature
B. stray losses
C. all-day efficiency
D. none of the aboveThe maximum efficiency of a distribution transformer is____________?
The maximum efficiency of a distribution transformer is____________?
A. at no load
B. at 50% full load
C. at 80% full load
D. at full loadThe thickness of laminations used in a transformer is usually____________?
The thickness of laminations used in a transformer is usually____________?
A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mmFor the parallel operation of single phase transformers it is necessary that they should have___________?
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.