A) reduces as load increases B) increases as load increases C) adjusts itself to new equilibrium speed whenever load changes D) always remains constant. Ans : (D)
A) 3 phase induction motor squirrel cage type B) 3 phase induction motor-slip ring type C) Synchronous motor working at leading power factor D) Synchronous motor working at lagging power factor. Ans : (C)
A) the excitation voltage will be more than the supply voltage B) the excitation voltage will be less than the supply voltage C) the excitation voltage will be equal to the supply voltage D) the excitation voltage will be independent of the supply voltage. Ans : (A)
A) rotor speed is equal to synchronous speed B) rotor speed is less than synchronous speed C) rotor speed is more than synchronous speed D) rotor speed is either less or more than synchronous speed. Ans : (D)
A) total number of rotor slots = total number of stator slots B) total number of rotor slots is more than total number of stator slots C) total number of rotor slots is less than total number of stator slots. Ans : (C)
A) damper bars develop induction generator torque B) harmonics are developed in the armature circuit C) negative phase sequence currents are generated D) field excitation increases. Ans : (A)
A) speed B) flux density C) horse power rating D) all of the above. Ans : (B)
A) 50 to 60 wb/m2 B) 5 to 6 wb/m2 C) 0.5 to 0.6 wb/m2 D) 0.05 to 0.46 wb/m2. Ans : (C)
A) low field current B) high core losses C) high field current D) low short circuit ratio. Ans : (A)
A) reactive power angle B) power factor angle C) power angle D) angle of lead. Ans : (C)