Equilizer rings are required in case armature is_______________?

Related Mcqs:

1. 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

2. 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

3. When two D.C. series generators are running in parallel, an equilizer bar is used________________?

   A. to increase the speed and hence generated e.m.f.
   B. to increase the series flux
   C. so that two similar machines will pass approximately equal currents to the load
   D. to reduce the combined effect of ar-mature reaction of both machines

4. When two D.C. generators are running in parallel an equilizer bar is used______________?

   A. to increase the series flux
   B. to increase the generated e.m.f.
   C. to reduce the combined effect of ar-mature reaction of both the machines
   D. so that the two identical machines will pass approximately equal cur¬rents to the load

5. The resistance of armature winding depends on

   A. length of conductor
   B. cross-sectional area of the conductor
   C. number of conductors
   D. all of the above

6. The commutator segments are connected to the armature conductors by means of___________?

   A. copper lugs
   B. resistance wires
   C. insulation pads
   D. brazing

7. In D.C. generators, current to the external circuit from armature is given through_____________?

   A. commutator
   B. solid connection
   C. slip rings
   D. none of above

8. Armature coil is short circuited by brushes when it lies_____________?

   A. along neutral axis
   B. along field axis
   C. in any of the above positions
   D. in none of the above positions

9. In a separately excited generator supplying rated load the armature reaction.

   A. is always present
   B. is always absent
   C. may be sometimes present
   D. none of the above

10. Armature reaction in a generator results in_____________?

    A. demagnetisation of leading pole tip and magnetisation of trailing pole tip
    B. demagnetisation of trailing pole tip and magnetisation of leading pole tip
    C. damagnetising the center of all poles
    D. magnetising the center of all poles