Hardness of martensite is about___________________?

Related Mcqs:

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

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

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

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

3. An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?

   A. 2% B. 4% C. 8% D. ±4% E. 1%....

4. 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...

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

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

6. 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...

7. The hardness of steel increases if it contains____________________?

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

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

   A. copper B. chromium C. nickel D. silicon E. none 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. The percentage of carbon in grey iron castings usually varies between __________________?

    A. 0.5 to 1% B. 1 – 2% C. 2.5 to 4.5% D. 5 – 7% E. 7-9%....