Electrical Machines Why are capacitors used with large AC induction motor? Improve power factor. Improve power level. Improve voltage level. Improve current level. Improve power factor. Improve power level. Improve voltage level. Improve current level. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The mechanical power is developed by a DC motor is maximum when back emf is equal to half of applied voltage. back emf is equal to applied voltage. back emf is equal to twice of applied voltage. none of above. back emf is equal to half of applied voltage. back emf is equal to applied voltage. back emf is equal to twice of applied voltage. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field to an AC source. to earth. in reverse. to a DC source. to an AC source. to earth. in reverse. to a DC source. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of 3 - Φ IM, plugging means interchanging two supply phases for quick stopping. pulling the motor directly on line without a rotor. starting the motor on load which is more than the rated load. locking of rotor due to harmonics. interchanging two supply phases for quick stopping. pulling the motor directly on line without a rotor. starting the motor on load which is more than the rated load. locking of rotor due to harmonics. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the mechanical angle α between the stator and rotor poles increases, then the stator current Remains unchanged. Decreases. None of above. Increases. Remains unchanged. Decreases. None of above. Increases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm? 5 10 24 12 5 10 24 12 ANSWER DOWNLOAD EXAMIANS APP
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