GETCO Exam Paper (30-11-2008)
Transfer of power between two power systems takes place with power flowing from the system with the

Higher voltage level
Lagging power angle
Greater leading power angle
Higher input current

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GETCO Exam Paper (30-11-2008)
In a transformer it is difficult to measure the efficiency by output-input measurement methods because

the output is sinusoidal and hence cannot be measured
losses are abnormally high
output is out of phase with respect to input
efficiency of transformer is usually high and hence extremely accurate measurements will be necessary

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