Electrical Machines A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss? 60W 40W 100W 80W 60W 40W 100W 80W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The stator core of a 3 - Φ induction motor is laminated in order to reduce the eddy current loss. both of the above. hysteresis loss. weight of the stator. eddy current loss. both of the above. hysteresis loss. weight of the stator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes : 1, 2 and 4 2, 3 and 4 1, 2, and 3 1 and 3 1, 2 and 4 2, 3 and 4 1, 2, and 3 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which motor used in Lathe machine? None of these D.C. cumulative compound motor. D.C. shunt motor. D.C . series motor. None of these D.C. cumulative compound motor. D.C. shunt motor. D.C . series motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A generator may loose residual magnetism due to heating. any of these. vibrations. over excitation. heating. any of these. vibrations. over excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Stray losses in transformer occurs in paper insulation in transformers. steel core. winding conductors and steel structures of transformer. transformer insulating oil. paper insulation in transformers. steel core. winding conductors and steel structures of transformer. transformer insulating oil. ANSWER DOWNLOAD EXAMIANS APP
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