is usually used for brush rockers____________?

Related Mcqs:

1. In a D.C. machine the current per brush arm should not be more than_____________?

   A. 100 A
   B. 200 A
   E. 300 A
   D. 400 A

2. In a D.C. machine the number of brush arms is _________ the number of poles?

   A. less than
   B. equal to
   C. greater than
   D. none of the above

3. In D.C. machines the number of slots per pole usually lies___________?

   A. between 2 to 4
   B. between 6 to 8
   C. between 9 to 16
   D. between 20 to 30

4. The laminations of the armature of a D.C. machine are usually ___________ thick?

   A. 0.1 to 0.2 mm
   B. 0.2 to 0.3 mm
   C. 0.3 to 0.4 mm
   D. 0.4 to 0.5 mm

5. The high voltage winding is usually which of the following type ?

   A. Cylindrical winding with circular conductors
   B. Cross-over winding with either circular or small rectangular conductors
   C. Continuous disc type winding with rectangular conductors
   D. All of the above types

6. Electrical machines having a power output up to about 750 W may be called__________machines?

   A. small size
   B. medium size
   C. large size
   D. any of the above

7. Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?

   A. small size
   B. medium size
   C. large size
   D. any of the above size

8. With direct water cooling it is possible to have ratings of about_____________?

   A. 200 MW
   B. 300 MW
   C. 400 MW
   D. 600 MW

9. Yokes with rectangular cross-section are used for_______________?

   A. small capacity transformers
   B. medium capacity transformers
   C. large capacity transformers
   D. any of the above

10. The cold rolled grain oriented steel has _________ permeability in the direction of the grain orientation?

    A. minimum
    B. maximum
    C. nil
    D. none of the above