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Answer :

Hopkinson's test on D.C. machines is conducted at full-load.

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Answer : Short circuit test on transformers is conducted to determine copper losses.

Description : An open-circuit test on a transformer is conducted primarily to measure?

Answer : The open-circuit test in a transformer is used to measure

Description : Sumpner's test is conducted on transformer to determine?

Answer : Sumpner's test is conducted on transformer to determine temprature.

Answer : The purpose of retardation test on D.C. shunt machines is to find out stray losses.

Description : In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

Answer : 3  Commutation