A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?

Related Mcqs:

1. Addition of ______________ in steel is helpful in increasing the depth of hardness?

   A. Chromium
   B. Sulphur
   C. Vanadium
   D. Tungsten

2. Addition of _____________ in steel can help in increasing the depth of hardness?

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

3. The increase in hardness of metal due to its cold working is termed as the _______________ hardening?

   A. Work
   B. Age
   C. Induction
   D. Flame

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

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

5. Silicon percentage in iron castings to have maximum hardness should be about__________________?

   A. 0.3
   B. 0.5
   C. 0.8
   D. 2.5

6. The softest material in Mho’s scale (for measuring hardness) is________________?

   A. Talc
   B. Gypsum
   C. Rubber
   D. None of these

7. Brinell Hardness Number (BHN) for talc is approximately in the range of____________________?

   A. 1-5
   B. 20-30
   C. 100 -150
   D. 200 – 250

8. Softness of silver can be converted into hardness by alloying it with small quantity of_________________?

   A. Copper & nickel
   B. Zinc
   C. Aluminium
   D. Tin

9. The range of Mho’s scale of hardness is from________________?

   A. 1 to 15
   B. 1 to 8
   C. 1 to10
   D. 0 to 10

10. When the steel is subjected to normalising, its ______________ decreases?

    A. Yield point
    B. Ductility
    C. Ultimate tensile strength (UTS)
    D. None of these