Related Mcqs:

1. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?

   A. demagnetisation only
   B. cross magnetisation as well as mag¬netisation
   C. crossmagnetisation as well as demagnetising
   D. cross magnetisation only

2. In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?

   A. 4
   B. 8
   C. 16
   D. 32

3. In the case of lap winding resultant pitch is____________?

   A. multiplication of front and back pitches
   B. division of front pitch by back pitch
   C. sum of front and back pitches
   D. difference of front and back pitches

4. In D.C. generators, lap winding is used for______________?

   A. high voltage, high current
   B. low voltage, high current
   C. high voltage, low current
   D. low voltage, low current

5. Lap winding is composed of_____________?

   A. any even number of conductors
   B. any odd number of conductors
   C. that even number which is exact multiple of poles + 2
   D. that even number which is exact multiple of poles

6. The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?

   A. 2
   B. 4
   C. 6
   D. 8

7. Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?

   A. 2 : 3
   B. 3 : 1
   C. 3 : 2
   D. 1 : 3

8. For both lap and wave windings, there are as many commutator bars as the number of_____________?

   A. slots
   B. armature conductors
   C. winding elements
   D. poles

9. The material for commutator brushes is generally_______________?

   A. mica
   B. copper
   C. cast iron
   D. carbon

10. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except______________?

    A. interpoles
    B. dummy coils
    C. compensating winding
    D. shifting of axis of brushes