Electrical Machines If a DC motor is connected across the AC supply it will Run at normal speed. Run at lower speed. Burn. Not run. Run at normal speed. Run at lower speed. Burn. Not run. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to infinity. unity. zero. two. infinity. unity. zero. two. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the back emf in DC motor vanishes suddenly the motor will run at very high speed. start haunting. run at very low speed. burn. run at very high speed. start haunting. run at very low speed. burn. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will increase to value lying between 220 V and 1.25 times 220 V not change and remain at 220 V increase to a value greater than 1.25 times 220 V increase to 1.25 times 220 V increase to value lying between 220 V and 1.25 times 220 V not change and remain at 220 V increase to a value greater than 1.25 times 220 V increase to 1.25 times 220 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of 51.5Hz 48.5Hz 1.5Hz 2.5Hz 51.5Hz 48.5Hz 1.5Hz 2.5Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The frame of an induction motor is made of aluminium. stainless steel. silicon steel. closed grained cast iron. aluminium. stainless steel. silicon steel. closed grained cast iron. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS