Electrical Machines The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________. 6. 4. 2. 8. 6. 4. 2. 8. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction? 750. 500. 200. 100. 750. 500. 200. 100. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a DC motor is connected across the AC supply it will Burn. Run at lower speed. Not run. Run at normal speed. Burn. Run at lower speed. Not run. Run at normal speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In 3 - Φ induction motor some times copper bars are placed deep in the rotor to reduce copper loss. improve efficiency. improve starting torque. improve power factor. reduce copper loss. improve efficiency. improve starting torque. improve power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following bearings and their uses are correct both A and B ball bearings → small machines neither 1 nor 2 roller bearings → large machines both A and B ball bearings → small machines neither 1 nor 2 roller bearings → large machines ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Motors for fans and pumps are selected in the rpm range 500 to 720. 375 to 500. 1440 to 2880. 720 to 920. 500 to 720. 375 to 500. 1440 to 2880. 720 to 920. ANSWER DOWNLOAD EXAMIANS APP
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