a) 0.5 to 0.7 b) 0.8 to 1.0 c) 1.1 to 1.3 d) 1.4 to 1.6 Ans: (c)
a) Armature b) Series field c) Shunt field d) Any of the above Ans: (a)
a) Ac b) Dc c) Ac as well as dc d) Transient Ans: (a)
a) The effect of magnetic field set up by field current b) The effect of magnetic field set up by armature current c) The effect of magnetic field set up by back emf d) Copper losses in the armature Ans: (b)
a) Dc series motor b) Dc shunt motor c) Dc series generator d) Dc shunt generator Ans: (c)
a) Increases proportionately b) Decreases in reverse proportion c) Remains constant d) Increases proportional to the square root of current Ans: (a)
a) The speed of the motor b) Flux required in the moor c) Torque required d) Voltage applied to the motor Ans: (c)
a) Commutation improves and speed decreases b) Commutation is unaffected and speed increases c) Commutation improves and speed increases d) Commutation worsens and speed decreases Ans: (c)
a) Half b) Slightly more than half c) Double d) Slightly less than double Ans: (d)
a) Opposes the applied voltage b) Assists the applied voltage c) Does not influence the applied voltage d) None of these Ans: (a)