Q. Nature of efficiency curve of DC machine is _________________

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Q. Why retardation test is carried on DC machine?

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Q. In the DC motor the iron losses occur in __________

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Q. Which of the following losses is not under constant losses?

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Q. Variable losses are proportional to ________

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Q. Swinburne’s test can be carried out on all DC motors.

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Q. Which of the following test will be suitable for testing two similar DC series motors of large capacity?

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Q. Which losses can be identified from Swinburne’s test?

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Q. While carrying out Swinburne’s test at rated armature voltage motor will run at ____________

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Q. In order to run motor on rated speed while carrying out Swinburne’s test we add ______________

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Q. What is the purpose of performing retardation test after Swinburne’s test?

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Q. Efficiency calculated by Swinburne’s test is _____________

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Q. Which of the following is not a disadvantage of a Swinburne’s test?

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Q. While carrying out retardation test, if t is equal to time constant then _____________

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Q. In retardation test _____________

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Q. Retardation curve is ______________

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Q. Hopkinson’s test of D.C. machines is conducted at _______________

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Q. Hopkinson’s test requires ____________

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Q. In Hopkinson’s test, two machines are connected in ______________

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Q. What will happen if field current of generator in Hopkinson’s test is increased?

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