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For carrying out load test on Hopkinson’s test setup _________________

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For carrying out load test on Hopkinson’s test setup _________________

(a) Actual load is needed

(b) By changing field currents in two machines load can be changed

(c) Can’t carry out

(d) By changing the armature current test is carried out

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The question is from Hopkinson’s Test topic in division Efficiency and Testing of DC Machines

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The correct option is (b) By changing field currents in two machines load can be changed

The best explanation: There is no need to arrange for actual load (loading resistors) which apart from the cost of energy consumed, would be prohibitive in size for large-size machines. By merely adjusting the field currents of the two machines, the load can be easily changed and a load test conducted over the complete load range in a short time.

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