Discussion
The blocked rotor test on an induction machine is carried out at reduced voltage because
Answer: D
Correct answer: rated voltage would give a destructive current
With the rotor held still the slip is unity, the machine is effectively a short-circuited transformer, and rated voltage would drive five or six times rated current through the windings. The test is therefore made at reduced voltage and the results scaled, which is legitimate because the series impedance is very nearly constant.
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