Electrical Machines A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be 36. 50. 18. 80. 36. 50. 18. 80. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. using a flywheel. any of above methods. designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. using a flywheel. any of above methods. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Universal motors are used in cranes traction food processing All of these cranes traction food processing All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 2, 4 1, 3 1, 4 2, 3 2, 4 1, 3 1, 4 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A short circuit test on a transformer gives copper loss at any load. copper loss at full load. copper loss at half load. copper loss at over load. copper loss at any load. copper loss at full load. copper loss at half load. copper loss at over load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will depend on other factors. reduce by 5 %. remain unchanged. increase by 5 %. depend on other factors. reduce by 5 %. remain unchanged. increase by 5 %. ANSWER DOWNLOAD EXAMIANS APP
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