In field’s test generator field and motor field are connected in ______________(a) Series(b) Parallel(c) Alternatively, series and parallel(d) Not connectedI had been asked this question during a job interview.The doubt is from Hopkinson’s Test topic in section Efficiency and Testing of DC Machines

In field’s test generator field and motor field are connected in ___

1.	In field’s test generator field and motor field are connected in ______________(a) Series(b) Parallel(c) Alternatively, series and parallel(d) Not connectedI had been asked this question during a job interview.The doubt is from Hopkinson’s Test topic in section Efficiency and Testing of DC Machines
Answer» The correct choice is (a) SERIES Best explanation: The generator FIELD is connected in series with motor field circuit. The generator is thus separately excited and its excitation is IDENTICAL to that of motor at all loads. This ensures that the iron-loss of both the machines are ALWAYS EQUAL.

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In field’s test generator field and motor field are connected in ______________(a) Series(b) Parallel(c) Alternatively, series and parallel(d) Not connectedI had been asked this question during a job interview.The doubt is from Hopkinson’s Test topic in section Efficiency and Testing of DC Machines
Why field test is conducted even if Hopkinson’s test is present?(a) Instability of an operation(b) Possibility of run-away speed(c) Both instability and possibility of run-away speed(d) Field test is not conductedI had been asked this question in examination.This intriguing question comes from Hopkinson’s Test in chapter Efficiency and Testing of DC Machines
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What will happen if field current of motor in Hopkinson’s test is decreased?(a) Current through motor armature will increase(b) Current through motor armature will decrease(c) Current through motor armature will remain constant(d) Motor armature current can’t be determinedI got this question in an international level competition.This is a very interesting question from Hopkinson’s Test topic in portion Efficiency and Testing of DC Machines
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In Hopkinson’s test, two machines are connected in ______________(a) Series(b) Parallel(c) Can be connected in parallel or series(d) Two machines are not requiredThis question was addressed to me in a job interview.My query is from Hopkinson’s Test in chapter Efficiency and Testing of DC Machines
Hopkinson’s test requires ____________(a) One DC machine on which test is carried out(b) Two different DC machines(c) Two identical DC machines(d) Can be worked with one or two machinesI got this question during an internship interview.The origin of the question is Hopkinson’s Test topic in portion Efficiency and Testing of DC Machines

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