A) reducing load B) reducing frequency C) supplying low voltage D) interchanging any two phases. Ans : (D)
A) get burnt B) no start C) run at 5/6 of the rated speed D) run at 6/5 of the rated speed. Ans : (C)
A) 0.2 lagging B) 0.2 leading C) zero D) unity. Ans : (A)
A) no load B) 50% load C) 75% load D) full load. Ans : (D)
A) 3 phase induction motor B) Single phase induction motor C) Synchronous motor D) 3 phase transformer. Ans : (B)
A) the power factor reduces B) stator current reduces C) slip increases D) magnetizing component of the stator exciting current increases. Ans : (C)
A) 10 HP, 730 rpm B) 10 HP, 960 rpm C) 10 HP, 1440 rpm D) 10 HP, 2880 RPM. Ans : (D)
A) very low B) high C) almost same D) exactly same. Ans : (B)
A) in rotor is negligible as compared to that in stator B) in rotor is much more than the iron loss in stator C) in rotor is equal to iron loss in stator D) iron loss in stator does not occur. Ans : (A)
A) slip increases B) torque increases C) torque decreases D) no relationship exists between speed slip and torque. Ans : (C)