A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transforme
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A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transforme
A no-load test is a test that is performed on a transformer when it is not carrying any electrical load. The primary purpose of a no-load test is to determine the magnetizing current of the transformer.
This test is performed by applying a rated voltage to the primary winding of the transformer and measuring the current flowing through the primary winding.
The magnetizing current is the current flowing through the primary winding when the transformer is in a no-load condition. This test helps to determine the no-load loss of the transformer.
A. Copper loss: This is not the correct option, as no load test is not to determine the copper loss.
B. Magnetizing current: This is the correct option, as the primary purpose of a no-load test is to determine the magnetizing current of the transformer.
C. Magnetising current and loss: This is not the correct option, as it is not only determining the magnetizing current but also the no-load loss.
D. Efficiency of the transformer: This is not the correct option, as the no-load test is not directly related to the efficiency of the transformer.
So, the correct answer is B. magnetizing current.