a) Constant b) Slightly drooping c) Slightly rising d) Highly drooping Ans: (d)
a) Shunt generator b) Series generator c) Shot shunt compound generator d) Level compound generator Ans: (d)
a) Armature reaction b) Armature resistance c) Weakening of the field due to armature reaction d) All of these Ans: (d)
a) Increases b) Decreases c) Remains unchanged d) May increase or decrease Ans: (b)
a) 5 to 10% b) 10 to 20% c) 20 to 30% d) 30 to 40% Ans: (d)
a) Low permeability b) High permeability c) More mechanical strength d) More mechanical strength and high permeability Ans: (d)
a) Electromechanical energy conversion b) Generation of voltage c) Commutation d) Development of torque Ans: (c)
a) Polar axis b) Brush axis c) Interpolar axis d) None of these Ans: (b)
a) The resistance of the armature is high b) There is no residual magnetism c) The field current is too small d) None of these Where ϕ is the flux and N is the speed Ans: (b)
a) Maximum current is produced b) Maximum emf is produced c) Minimum emf is product d) Minimum current is produced Ans: (c)