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

Related Mcqs:

1. 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

2. For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?

   A. 1.0 Wb/m2
   B. 1.1 Wb/m2
   C. 1.3 Wb/m2
   D. 1.6 Wb/m2
   E. None of the above

3. Hot rolled sheets have ___________ value of permeability?

   A. zero
   B. low
   C. high
   D. none of the above

4. In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?

   A. 5 percent
   B. 10 percent
   C. 15 percent
   D. 30 percent
   E. none of the above

5. The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?

   A. 0.5 to 0.8 Wb/m2
   B. 0.8 to 1.0 Wb/m2
   C. 1.1 to 1.35 Wb/m2
   D. 1.4 to 1.8 Wb/m2

6. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?

   A. Cast steel
   B. Aluminium
   C. Soft steel
   D. Cast iron

7. In _________ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft?

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

8. 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

9. With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?

   A. 50 MW
   B. 100 MW
   C. 200 MW
   D. none of the above

10. Power transformers have rating_______________?

    A. equal to 50 kVA
    B. equal to 100 kVA
    C. above 200 kVA
    D. none of the above