Which of the following is not a routine test on transformers ?
Which of the following is not a routine test on transformers ?
A. Core insulation voltage test
B. Impedance test
C. Radio interference test
D. Polarity test
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A Transformer transforms____________?
A Transformer transforms____________?
A. voltage
B. current
C. current and voltage
D. powerAn ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
A. true
B. falseA common method of cooling a power transformer is_______________?
A common method of cooling a power transformer is_______________?
A. natural air cooling
B. air blast cooling
C. oil cooling
D. any of the aboveIn a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the aboveThe 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 factorThe 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 voltage