Electrical Machines Mcqs Part 02

11. Which property of copper enables it to be drawn into thin wires and sheets ?
a. Ductility
b. Elasticity
c. Toughness
d. Tenacity

12. Which is non-magnetic material
a. Nickel
b. Cobalt
c. Aluminium
d. Gadolinium

13. Which of the following is the least desired property in magnetic material for electrical engineering applications
a. High magnetic permeability
b. High electrical permeability
c. Large hysteresis loop
d. All of the above

14. Above curic point
a. a ferromagnetic material becomes paramagnetic
b. a ferrite becomes an insulator
c. a insulating material becomes a ferrite
d. a diamagnetic material becomes becomes a paramagnetic material

15. For a simplex lap winding , the winding pitch is equal to
a. + 2
b. – 2
c. +- 1
d. +- 2

16. Which of the following is a paramagnetic material?
a. Palladium
b. Lead
c. Pure iron
d. All of the above

17. Which of the following is a ferromagnetic material?
a. Pure iron
b. Lead
c. Bismuth
d. Water

18. All of the following are ferromagnetic material is EXCEPT
a. Nickel
b. Bismuth
c. Silicon
d. Mild steel

19. Diamagnetic : Copper : Ferromagnetic :
a. Iron
b. Lead
c. Air
d. Water

20. Diamagnetic : Ferromagnetic :
a. Copper : Silver
b. Air : Water
c. Iron : Steel
d. Lead : Cobalt