a) It demagnetizes or reduces the main flux b) It cross-magnetizes the main flux c) It magnetizes or reinforces the main flux d) Both (a) and (a) Ans: (d)
a) Always N b) Always S c) Same as the main pole ahead d) Same as main pole behind Ans: (c)
a) Larger b) Smaller c) The same d) Much smaller Ans: (a)
a) Both IPW and CPW are in parallel b) Both IPW and CPW are in series c) IPW is in series and CPW is in parallel d) IPW is in parallel and CPW is in series Ans: (b)
a) Armature reaction in the interpole zone b) Armature reacting in the commu-tating zone c) Armature reaction under the pole faces d) Cross-magnetizing armature reaction Ans: (c)
a) It is cheaper b) It completes the magnetic path c) It gives mechanical protection to the machine d) All of these Ans: (d)
a) Entirely in the armature slots b) Entirely in the slots in the pole faces c) Partly in armature slots and partly in slots in pole faces d) Around the pole core Ans: (b)
a) Pulsating b) Rectangular c) Triangular d) Sinusoidal Ans: (c)
a) Its main switch is suddenly opened b) Its field current is gradually reduced c) The input to its prime move is suddenly reduced to zero d) None of these Ans: (b)
a) Self-excited generator b) Separately excited generator c) Both (a) and (b) d) None of these Ans: (a)