GETCO Exam Paper (30-11-2008)
Transmission efficiency increases as

voltage and power factor both increase
voltage decreases but power factor increases
voltage and power factor both decrease
voltage increases but power factor decreases

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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

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

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