Machining properties of steel are improved by adding___________________?

Related Mcqs:

1. A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?

   A. molecular change
   B. physical change
   C. allotropic change
   D. solidus change
   E. atomic change

2. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?

   A. allotropic change
   B. recrystallisation
   C. heat treatment
   D. precipitation
   E. austempering

3. Which is false statement about properties of aluminium ___________________?

   A. modulus of elasticity is fairly low
   B. wear resistance is very good
   C. fatigue strength is not high
   D. creep strength limits its use to fairly low temperatures
   E. corrosion resistance is good

4. At which pressure the properties of water and steam become identical_________________?

   A. 0.1 kg/cm2
   B. 1 kg/cm2
   C. 100 kg/cm2
   D. 225.6 kg/cm2
   E. it is never possible

5. Pick up wrong statement about desired properties of a good fuel__________________?

   A. high calorific value
   B. produce minimum smoke and gases
   C. ease in storing
   D. high ignition point
   E. ecomomical

6. Eutectoid steel contains following percentage of carbon_______________?

   A. 0.02%
   B. 0.3%
   C. 0.63%
   D. 0.8%
   E. 1.2%.

7. Tensile strength of steel can be safely in-creased by________________?

   A. adding carbon up to 2.8%
   B. adding carbon up to 6.3%
   C. adding carbon up to 0.83%
   D. adding small quantities of copper
   E. adding copper and carbon

8. The machinability of steel is increased by___________________?

   A. silicon and sulphur
   B. phosphorous, lead and sulphur
   C. sulphur, graphite and aluminium
   D. phosphorous and aluminium
   E. none of the above

9. The percentage of carbon in low carbon steel is__________________?

   A. 0.05%
   B. 0.15%
   C. 0.3%
   D. 0.5%
   E. 0.7%.

10. 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