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Answer Posted / half1951wit0202
Hopkinsons test is also referred as the "Regenerative" or
"Back-to-Back" test. Two identical DC machines are
connected parallely, where as the first machine gets supply
from the DC power source, and acts as a motor and is in turn mechanically coupled to the next machine and makes it to run as a generator. The electrical output power from the generator(second machine) is fed to the motor(First machine) and vice-versa. But due to the losses in these two machines the output from the generator and the motors are not sufficient to run each other, hence the losses are to be compensated externally. In the original Hopkinsons' tests this external power supply was made mechanically by an additional motor coupled through belt-drive. However , in the modified Hopkinson's tests , the external power is supplied electrically from the DC power source.
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