Electrical Machines The armature voltage control is considered suitable for a DC motor driven at constant torque. speed. current. power. torque. speed. current. power. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Sparkless commutation can be achieved by employing high resistance carbon brushes. compensating winding. inter poles. any one or more of the above methods. high resistance carbon brushes. compensating winding. inter poles. any one or more of the above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss will depends on f² f³ f1.6 f f² f³ f1.6 f 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 3 1 and 3 2, 3 and 4 1, 2 and 4 1, 2, and 3 1 and 3 2, 3 and 4 1, 2 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A small air gap in poly phase induction motor helps to increase starting torque. reduce chance of crawling. reduce magnetizing current. reduce chance of cogging. increase starting torque. reduce chance of crawling. reduce magnetizing current. reduce chance of cogging. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which type motors are preferred for lathes? Squirrel Cage induction motor. DC shunt motors. Either A or B. Synchronous motor. Squirrel Cage induction motor. DC shunt motors. Either A or B. Synchronous motor. ANSWER DOWNLOAD EXAMIANS APP
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