Electrical Machines The commutator segments of DC machines are made up of brass copper hard-drawn copper copper alloy brass copper hard-drawn copper copper alloy ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The short circuit test on a transformer is conducted to obtain hysteresis loss. eddy current loss. copper losses. core loses only. hysteresis loss. eddy current loss. copper losses. core loses only. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes : 1, 2 and 3 2 and 3 1 and 3 1 and 2 1, 2 and 3 2 and 3 1 and 3 1 and 2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be 16.55 Nm 15.6 Nm 15.28 Nm 15.92 Nm 16.55 Nm 15.6 Nm 15.28 Nm 15.92 Nm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the temperature of armature resistance is increased, the speed of a series motor would None of above. increase. decrease. not change. None of above. increase. decrease. not change. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loop represents the area of hysteresis loss eddy current loss copper loss total iron losses hysteresis loss eddy current loss copper loss total iron losses ANSWER DOWNLOAD EXAMIANS APP
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