GETCO Exam Paper (30-11-2008)
Two transformers are connected in parallel and share loads in the ratio of their kVA ratings when their ohmic impedances are

purely reactive
in inverse ratio of their ratings
in direct ratio of their ratings
equal

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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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