Electrical Machines What is power factor of a 3 - φ induction motor at no load? Same as full load. High. Equal to 1. Low. Same as full load. High. Equal to 1. Low. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor None of these. Increase. Remains same. Decrease. None of these. Increase. Remains same. Decrease. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous motor, the damper winding is generally used to prevent hunting and provide the starting torque. provide starting torque only. reduce noise level only. reduce the eddy currents. prevent hunting and provide the starting torque. provide starting torque only. reduce noise level only. reduce the eddy currents. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by changing the field excitation. varying the applied voltage. changing the load. varying the speed. changing the field excitation. varying the applied voltage. changing the load. varying the speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred? Slip ring induction motor. Stepper motor. Synchronous motor. DC differential compound motor. Slip ring induction motor. Stepper motor. Synchronous motor. DC differential compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a DC motor is connected across the AC supply it will Burn. Not run. Run at normal speed. Run at lower speed. Burn. Not run. Run at normal speed. Run at lower speed. ANSWER DOWNLOAD EXAMIANS APP
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