Electrical Machines As compared to an induction motor, the air gap in a DC motor is between 50% and 90%. same. more. less than 50%. between 50% and 90%. same. more. less than 50%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dummy coils are used for All of these increasing efficiency. mechanical balancing. reducing armature reaction. All of these increasing efficiency. mechanical balancing. reducing armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Crawling in an induction motor is due to slip ring rotor. time harmonics in supply. insufficient starting torque. space harmonics produced by winding currents. slip ring rotor. time harmonics in supply. insufficient starting torque. space harmonics produced by winding currents. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is some what less than 230 V some what more than 230 V 230 V not possible some what less than 230 V some what more than 230 V 230 V not possible ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 5% 25% 4% 2% 5% 25% 4% 2% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Exciting current of an induction motor is lesser than power transformer. higher than power transformer. equal as power transformer. none of these. lesser than power transformer. higher than power transformer. equal as power transformer. none of these. ANSWER DOWNLOAD EXAMIANS APP
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