Which of the following loss in a transformer is zero even at full load ____________?
Which of the following loss in a transformer is zero even at full load ____________?
A. Core loss
B. Friction loss
C. Eddy current loss
D. Hysteresis loss
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Open circuit test on transformers is conducted to determine____________?
Open circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current lossesThe 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 mmThe leakage flux in a transformer depends upon______________?
The leakage flux in a transformer depends upon______________?
A. load current
B. load current and voltage
C. load current, voltage and frequency
D. load current, voltage, frequency and power factorWhich type of winding is used in 3 phase shell-type transformer?
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular typeWhen a given transformer is run at its rated voltage but reduced frequency, its____________?
When a given transformer is run at its rated voltage but reduced frequency, its____________?
A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increasedPower transformers are designed to have maximum efficiency at___________?
Power transformers are designed to have maximum efficiency at___________?
A. nearly full load
B. 70% full load
C. 50% full load
D. no load