Which of the following elements does not impart hardness to steel__________________?

Related Mcqs:

1. The following element can’t impart high strength at elevated temperature__________________?

   A. manganese
   B. magnesium
   C. nickel
   D. silicon
   E. none of the above

2. The surface hardness of the following order is achieved by nitriding operation__________________?

   A. 600 VPN
   B. 1500 VPN
   C. 1000 to 1100 VPN
   D. 250 VPN
   E. 2000 VPN

3. Hardness of steel depends on_________________?

   A. amount of carbon it contains
   B. the shape and distribution of the car-bides in iron
   C. method of fabrication
   D. contents of alloying elements
   E. the quality of ore from which it is made

4. Depth of hardness of steel is increased by addition of_________________?

   A. nickel
   B. chromium
   C. tungsten
   D. vanadium
   E. ell of the above

5. Hardness of martensite is about___________________?

   A. RC 65
   B. RC 48
   C. RC 57
   D. RC 80
   E. RC 32

6. Hardness of lower bainite (tempered martensite) is about________________?

   A. RC 65
   B. RC 48
   C. RC 57
   D. RC 80
   E. RC 32

7. Hardness of upper bainite (acicular structure) is about___________________?

   A. RC 65
   B. RC 48
   C. RC 57
   D. RC 80
   E. RC 32.

8. The hardness of steel increases if it contains____________________?

   A. austenite
   B. martensite
   C. pearlite
   D. cementite
   E. all of the above

9. The hardness of steel primarily depends on _____________________?

   A. %age of carbon
   B. %age of alloying elements
   C. heat treatment employed
   D. method of manufacture
   E. shape of carbides and their distribution in iron

10. Following elements have face-centred cubic structure__________________?

    A. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
    B. Mg, Zn, Ti, Zr, Br, Cd
    C. a iron (below 910°C and between 1400 to 1539°C), W
    D. all of the above
    E. none of the above