Electrical Machines Which of the following motors has low ratings only? Shaded pole Capacitor run Capacitor start Resistance split phase Shaded pole Capacitor run Capacitor start Resistance split phase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is 6 ohms. 1.9 ohms. 2.2 ohms. 5.7 ohms. 6 ohms. 1.9 ohms. 2.2 ohms. 5.7 ohms. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In travelling cranes for crane travel, trolley and boom hoist which motor is preferred? Stepper motor. Slip ring induction motor. Synchronous motor. DC differential compound motor. Stepper motor. Slip ring induction motor. Synchronous motor. DC differential compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the back emf in DC motor vanishes suddenly the motor will start haunting. burn. run at very high speed. run at very low speed. start haunting. burn. run at very high speed. run at very low speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a 3-phase induction motor operating in its stable region increases with increase in the load torque. decreases with decrease in the load torque. remains constant. decreases with increase in the load torque. increases with increase in the load torque. decreases with decrease in the load torque. remains constant. decreases with increase in the load torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by any of above methods. designing the motor for adequate synchronizing power. using a flywheel. providing damper winding in the rotor pole faces. any of above methods. designing the motor for adequate synchronizing power. using a flywheel. providing damper winding in the rotor pole faces. ANSWER DOWNLOAD EXAMIANS APP
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