A) inserting resistance in rotor circuit B) injecting emfs in the rotor circuit C) cascade connections D) any of the above methods. Ans : (D)
A) unequal phase resistance B) open circuit C) inter-turn short circuit on rotor D) any of the above. Ans : (D)
A) two windings in rotor and one winding in stator B) two windings in stator and one winding in stator C) all windings located in stator D) all windings located in stator. Ans : (A)
A) Total stator current B) Exciting current C) Rotor current D) Rotor current referred to stator. Ans : (D)
A) rotor induced emf is very small B) slip is very large C) rotor current is large D) power factor is large. Ans : (A)
A) motor is run in reverse direction B) motor is loaded beyond full load C) the balanced supply voltage is fed to the motor D) there is no load on the motor. Ans : (B)
A) number of stator teeth - number of rotor teeth = odd number B) number of stator teeth - number of rotor teeth = even number C) number of stator teeth - number of rotor teeth = negative number D) number of stator teeth - number of rotor teeth = 0. Ans : (D)
A) Change of number of poles B) Change of rotor resistance C) Change of supply voltage frequency D) Change of supply voltage. Ans : (B)
A) 2 B) 4 C) 8 D) 16. Ans : (B)
A) It can operate on lagging as well as leading power factor B) It has no commutator C) It has no slip rings D) Slip increases as the load on the motor increases. Ans : (A)