The main constituent of carborundum is ___________________ carbide?

Related Mcqs:

1. Which of the following has no effect on the carbide forming tendency in steels ?

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

2. Which of the following has a very high carbide forming tendency in steels ?

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

3. Carbon is present in the combined form (carbide) in case of______________________?

   A. Pig iron
   B. Steel
   C. Ferroalloys
   D. All A., B. & C.

4. With increase in carbide/graphite ratio in cast iron, its__________________?

   A. Hardness & brittleness increases
   B. Ductility decreases
   C. Both A. and B.
   D. Neither A. nor B.

5. A metallic alloy in which one of the constituent metal is _____________, is called an amalgam?

   A. Zinc
   B. Mercury
   C. Lead
   D. Tin

6. Nickel is a constituent of ________________________?

   A. Bronze
   B. Solder
   C. Duralumin
   D. Monel metal

7. Very high sulphur in pig iron makes ___________________?

   A. Its casting unsound
   B. Its hard and machinable
   C. Its brittle and malleable
   D. All A., B. & C.

8. Carbon content in steel is ___________________ percent?

   A. 0.1-2
   B. 4-6
   C. 2-4
   D. 0.001-0.01

9. Addition of 2% nickel in steel makes it suitable for making ___________________?

   A. Electronic valves
   B. Boiler plates, rivets etc.
   C. Turbine blades
   D. Connecting rod

10. Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)___________________?

    A. Do not require heat treatment for any of its applications
    B. Are used for leaf and coiled springs
    C. Do not have good resilience properties
    D. Is tempered at 850°C