Number of tappings for each equalizer ring is equal to_____________?

Related Mcqs:

1. Interpole flux should be sufficient to_____________?

   A. neutralise the commutating self induced e.m.f.
   B. neutralise the armature reaction flux
   C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
   D. perform none of the above functions

2. In case of D.C. machine winding, number of commutator segments is equal to______________?

   A. number of armature coils
   B. number of armature coil sides
   C. number of armature conductors
   D. number of armature turns

3. Copper brushes in D.C. machine are used_____________?

   A. where low voltage and high currents are involved
   B. where high voltage and small cur-rents are involved
   C. in both of the above cases
   D. in none of the above cases

4. Iron losses in a D.C. machine are independent of variations in_____________?

   A. speed
   B. load
   C. voltage
   D. speed and voltage

5. 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

6. The demagnetising component of armature reaction in a D.C. generator___________?

   A. reduces generator e.m.f.
   B. increases armature speed
   C. reduces interpoles flux density
   D. results in sparking trouble

7. In case of a flat compounded generator:

   A. voltage generated is less than the rated voltage
   B. generated voltage is proportional to the load on the generator
   C. voltage remains constant irrespective of the load
   D. speed varies in proportion to the load on the generator

8. In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?

   A. there is no load on|he generator
   B. the generator runs on full load
   C. the generator runs on overload
   D. the generator runs on designed speed

9. Which generator would you prefer for feeding long D.C. transmission lines ?

   A. Series generator
   B. Shunt generator
   C. Over compound generator
   D. Flat compound generator

10. A series generator can self-excite:______________?

    A. only if the load current is zero
    B. only if the load current is not zero
    C. irrespective of the value of load current
    D. none of the above