Discussion
A blocked rotor test on an induction motor is carried out at
Answer: C
Correct answer: reduced voltage
With the rotor held still the machine is a short-circuited transformer, so rated voltage would drive five to seven times rated current and overheat the windings in seconds. The voltage is raised only until rated current flows, typically 15 to 25 per cent of rated, and the impedance measured then applies at full voltage because it is essentially linear.
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