Electrical Machines Armature reaction in dc motor results increase in speed. short circuit. open circuit. decrease in speed. increase in speed. short circuit. open circuit. decrease in speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under commutation results in sparking the trailing edge of the brush. sparking at the middle of the brush. sparking at the leading edge of the brush. no sparking. sparking the trailing edge of the brush. sparking at the middle of the brush. sparking at the leading edge of the brush. no sparking. ANSWER DOWNLOAD EXAMIANS APP
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. 0.443. 0.649. 0.573. 0.512. 0.443. 0.649. 0.573. 0.512. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Torque developed in the rotor is not dependent on the slip either of these directly proportional to slip inversely proportional to slip not dependent on the slip either of these directly proportional to slip inversely proportional to slip ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be cross-magnetization as well as demagnetization. cross-magnetisation. none of above. demagnetisation. cross-magnetization as well as demagnetization. cross-magnetisation. none of above. demagnetisation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the back emf in DC motor vanishes suddenly the motor will run at very low speed. run at very high speed. start haunting. burn. run at very low speed. run at very high speed. start haunting. burn. ANSWER DOWNLOAD EXAMIANS APP
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