Electrical Machines The principal of starting of 3 - Φ IM is similar to transformer with short-circuited secondary. capacitor run IM. repulsion motor type starting. synchronous motor. transformer with short-circuited secondary. capacitor run IM. repulsion motor type starting. synchronous motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines 3rd harmonics are eliminated in induction motor by using star connection. V connection. zig - zag connection. delta connection. star connection. V connection. zig - zag connection. delta connection. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the air gap of IM is increased, ____________ will increase. power factor. speed. air gap flux. magnetizing current. power factor. speed. air gap flux. magnetizing current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An IM cannot run at synchronous speed because rotor torque will not be produced. air friction will prevent it. none of above. induction motor will become synchronous motor. rotor torque will not be produced. air friction will prevent it. none of above. induction motor will become synchronous motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines How can the synchronous speed of a 3 - Φ IM be varied? By varying the supply frequency. By varying supply voltage. Both (A) and (B). By varying number of poles. By varying the supply frequency. By varying supply voltage. Both (A) and (B). By varying number of poles. ANSWER DOWNLOAD EXAMIANS APP