a) Field current b) Applied voltage c) Resistance in series with armature d) Any of these Ans: (d)
a) 1/2 back emf b) √2 back emf c) 2 back emf d) 1/√2 back emf Ans: (c)
a) Can be controlled by shunt field regulator b) Can not be controlled by diverter c) Increases as flux decreases d) Increases as armature circuit resistance increases Ans: (c)
a) Always constant b) Directly proportional to back emf c) Directly proportional to flux d) Inversely proportional to the product of back emf and flux. Ans: (b)
a) Infinity b) Higher than no load speed c) Equal to the no load speed d) Lower than the no load speed Ans: (c)
a) Unaltered b) Zero c) Doubled d) Halved Ans: (c)
a) Low speed operation b) High speed operation c) Variable speed variation d) Fixed speed operation Ans: (c)
a) Infinitely large b) Large c) About 100Ω d) Small Ans: (d)
a) Not run b) Burn out c) Run smoothly d) Run with less efficiency and high sparking Ans: (d)
a) Series motor b) Shunt motor c) Cumulatively compound motor d) Differentially compound motor Ans: (b)