GETCO Exam Paper (30-11-2008)
Which of the following connection of transformer will give the highest secondary voltage?

Delta primary, delta secondary
star primary, delta secondary
Delta primary, star secondary
star primary, star secondary

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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
output is out of phase with respect to input
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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