Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.573. 0.443. 0.512. 0.649. 0.573. 0.443. 0.512. 0.649. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For higher values of armature, the speed of a DC series motor is Proportional to armature current. Inversely proportional to armature current. Proportional to the square of armature current. Constant. Proportional to armature current. Inversely proportional to armature current. Proportional to the square of armature current. Constant. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC Shunt Motor has disadvantage(s) of less expensive. constant speed. not suitable for rapidly changing loads. none of above. less expensive. constant speed. not suitable for rapidly changing loads. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature voltage control is considered suitable for a DC motor driven at constant power. torque. current. speed. power. torque. current. speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush? In case of any sparking they will be less damaged than copper brushes All of these They are self lubricating in nature They are not hard as copper brush In case of any sparking they will be less damaged than copper brushes All of these They are self lubricating in nature They are not hard as copper brush ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the field connection of a DC Shunt Motor is changed then it will run in same direction by slowly. motor will not run. it will run in opposite direction. it will run in same direction. it will run in same direction by slowly. motor will not run. it will run in opposite direction. it will run in same direction. ANSWER DOWNLOAD EXAMIANS APP
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