A) Pull-up torque B) Reluctance torque C) Asynchronous torque D) Synchronous torque. Ans : (D)
A) Stator winding to earthed frame B) Rotor winding to earthed shaft C) Phase to phase winding resistance D) All of the above. Ans : (D)
A) Low HP low speed B) High HP high speed C) High HP low speed D) Low HP high speed. Ans : (C)
A) low excitation only B) high excitation only C) both low and high excitation. Ans : (C)
A) Pull out torque B) Reluctance torque C) Synchronous torque D) Average torque. Ans : (A)
A) Synchronous torque B) Pull in torque C) Pull up torque D) Pull out torque. Ans : (B)
A) Variation of power factor with dc field current when load on the motor remains constant B) Variation of field current and supply voltage when excitation remains constant C) Variation of power factor and supply voltage when motor is hunting D) None of the above. Ans : (A)
A) the motor is delivering reactive power to the mains B) the motor is absorbing reactive power to the mains C) the motor is neither absorbing nor delivering reactive power. Ans : (B)
A) Reluctance torque B) Synchronous torque C) Pull up torque D) Locked-rotor torque. Ans : (D)
A) 40 minutes B) about one minute C) about one second D) about one hour. Ans : (C)