Related Questions

Open circuit test on transformers is conducted to determine
A hysteresis losses
B copper losses
C core losses
D eddy current losses
Sumpner's test is conducted on transformers to determine
A temperature
B stray losses
C all-day efficiency
D none of the above
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings
While conducting short-circuit test on a transformer the following side is short circuited
A High voltage side
B Low voltage side
C Primary side
D Secondary side
Short-circuit test on an induction motor cannot be used to determine
A Windage losses
B Copper losses
C Transformation ratio
D Power scale of circle diagram
In deriving ac equivalent circuit for an amplifier circuit we short circuit
A All resistors
B All transistors
C All inductors
D All capacitors
An open-circuit test on a transformer is conducted primarily to measure
A insulation resistance
B copper loss
C core loss
D total loss
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
During short circuit test iron losses are negligible because
A the current on secondary side is negligible
B the voltage on secondary side does not vary
C the voltage applied on primary side is low
D full-load current is not supplied to the transformer
The duration of sudden short-circuit test on a synchronous motor is usually about
A one hour
B one minute
C one second
D none of the above

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