A) ac supply at 400 V B) dc supply at 100 V - 250 V C) Revolving field D) Induction from stator currents. Ans : (B)
A) the motor will stop B) the motor will burn C) the motor will run as a reluctance motor at the same speed D) the motor will run as a reluctance motor at a lower speed. Ans : (A)
A) to provide starting torque only B) to reduce noise level C) to reduce eddy currents D) to prevent hunting and provide the starting torque. Ans : (D)
A) rotor excitation only B) rotor speed only C) rotor excitation and rotor speed D) coupling angle, rotor speed and excitation. Ans : (A)
A) no B) 2 C) 3 D) 5. Ans : (B)
A) 1 B) 1.1 C) 1.21 D) infinity. Ans : (A)
A) slip torque B) pull out torque C) synchronizing torque D) breaking torque. Ans : (C)
A) the motor is said to be fully loaded B) the excitation is said to be 100% C) the excitation is said to be zero percent D) the torque generated is maximum. Ans : (B)
A) synchronous motor B) wound rotor induction motor C) squirrel cage induction motor D) dc series motor. Ans : (A)
A) flux density B) number of poles C) rotor excitation D) speed of rotor. Ans : (C)