a) Increase by a factor of 4 b) Remain same c) Increase by a factor 2 d) Decrease by a factor 2 Ans: (b)
a) Magnetic losses b) Mechanical losses c) Field copper loss d) Armature copper loss Ans: (b)
a) Mechanical losses b) Magnetic losses c) Winding losses d) Both (a) and (b) Ans: (d)
a) Reactance voltage b) The capacitor action with two segment as electrodes and mica as the dielectric c) The air gap between the brushes and the commutator surface d) None of these Ans: (a)
a) Field b) Brush c) Armature d) Compensating pole Ans: (a)
a) Shift the brushes in lagging direction of rotation b) Shift the brushes in leading direction of rotation c) Interchange the terminals at the brushes d) None of these Ans: (b)
a) Stray losses are equal to copper losses b) Magnetic losses are equal to mechanical losses c) Armature copper losses are equal to constant losses d) Field copper losses are equal to constant losses Ans: (c)
a) 0 - 10% of full load losses b) 10 -20% of full load losses c) 20 – 30% of full load losses d) 30 – 40 % of full load losses Ans: (d)
a) Stray losses b) Field losses of shunt generator c) Armature losses of a compound generator d) Both (b) and (c) Ans: (d)
a) Avoid overhang b) Avoid noise c) Avoid harmonics d) Avoid unequal distribution of current at brushes Ans: (d)