GETCO Exam Paper (30-11-2008)
The power transmitted will be maximum when

receiving end voltage is more
sending end voltage is more
corona losses are least
reactance is high

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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

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

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