Electrical Machines What is the phase difference between two windings of A.C servomotor ? 90°. 60°. 30°. 120°. 90°. 60°. 30°. 120°. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred? Stepper motor. DC differential compound motor. Synchronous motor. Slip ring induction motor. Stepper motor. DC differential compound motor. Synchronous motor. Slip ring induction motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The sparking at the the brushes, in a DC machines is due to presence of commutator. high resistance of carbon brushes. armature reaction. reactance voltage. presence of commutator. high resistance of carbon brushes. armature reaction. reactance voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine torque is proportional to which of the following? flux(φ) armature current(Ia) both A and B None of these flux(φ) armature current(Ia) both A and B None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor Remains unchanged. Increases. Decreases. Oscillates around the rated speed. Remains unchanged. Increases. Decreases. Oscillates around the rated speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A? 11% 21% 41% 10% 11% 21% 41% 10% ANSWER DOWNLOAD EXAMIANS APP
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