Related Mcqs:

1. According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?

   A. motion of conductor
   B. lines of force
   C. either of the above
   D. none of the above

2. While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?

   A. direction of induced e.m.f.
   B. direction of flux
   C. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
   D. direction of motion of conductor, if forefinger points along the lines of flux

3. If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?

   A. Blv
   B. Blv2
   C. Bl2v
   D. Bl2v2

4. Eddy currents are induced in the pole shoes of a D.C. machine due to______________?

   A. oscillating magnetic field
   B. pulsating magnetic flux
   C. relative rotation between field and armature
   D. all above

5. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?

   A. 640 V
   B. 620 V
   C. 600 V
   D. 580 V

6. In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called____________?

   A. rotor
   B. stator
   C. field
   D. armature

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. 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

9. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?

   A. zero
   B. small
   C. the same as rated voltage
   D. high

10. In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?

    A. lie under south pole
    B. lie under north pole
    C. lie under interpolar region
    D. are farthest from the poles