Addition of _____________________ to steel does not impart hardness?

Related Mcqs:

1. Mho’s scale of hardness, which consists of 10 standard minerals is used for the measurement of _______________ hardness?

   A. Scratch
   B. Indentation
   C. Dynamic
   D. Rebound

2. Addition of _______________ to steel does not help in improving its machinability ?

   A. Sulphur
   B. Silicon
   C. Lead
   D. Phosphorous

3. Addition of ____________________ to steel does not help in improving its machinability?

   A. Sulphur
   B. Silicon
   C. Lead
   D. Phosphorous

4. High speed steel tools retain their hardness upto a temperature of __________________ °C?

   A. 500
   B. 750
   C. 900
   D. 1100

5. All of the following alloying elements of steel increases hardness but sacrifice ductility, except________________?

   A. Nickel
   B. Vanadium
   C. Molybdenum
   D. Chromium

6. The ability of tool steel to resist softening at high temperatures is termed as __________________ hardness?

   A. Red
   B. Extended
   C. Super
   D. Extreme

7. Maximum change in the hardness of martensite occurs in the carbon content range of _____________ percent in steel?

   A. 0.01 to 0.10
   B. 0.2 to 0.4
   C. 0.5 to 0.7
   D. 0.8 to 1.0

8. ________________ property of steel increases by addition of large amount of silicon in it?

   A. Mechanical
   B. Machining
   C. Magnetic
   D. Refractory

9. Cementite is in the lamellar form in the _____________________ phase of steel ?

   A. Martenistic
   B. Bainitic
   C. Pearlitic
   D. Ferritic

10. To improve the machinability of steel, it is generally subjected to _____________________?

    A. Spheroidising
    B. Tempering
    C. Normalising
    D. Annealing