A) Open stator coils B) Low voltage C) One phase open D) Any of the above. Ans : (D)
A) Zero B) 50 rpm C) 750 rpm D) 1500 rpm. Ans : (A)
A) Slip test B) Stator resistance test C) Short circuit test D) Open circuit test. Ans : (C)
A) 10 to 20 B) 4 to 9 C) 2 to 4 D) 1 to 2. Ans : (B)
A) burning of rotor B) burning of three phase windings C) burning of two phase windings D) burning of one phase winding. Ans : (D)
A) with injected emf B) at full load C) at light load D) at no load. Ans : (A)
A) power factor will increase B) the magnetizing current of the rotor will decrease C) the magnetizing current of the rotor will increase D) noise will increase. Ans : (B)
A) get burnt when switched on B) not start C) continue to work normally but in the reverse direction D) continue to work normally in the same direction earlier. Ans : (C)
A) DOL B) Auto transformer C) Rheostat D) Star-delta. Ans : (D)
A) a synchronous motor B) an induction generator C) an induction motor D) none of the above. Ans : (B)