Carbon supply in pack carburising process is in the form of ___________________?

Related Mcqs:

1. Which of the following are made out of the carbon steel having carbon content of 0.9 to 1%?

   A. Small punches, broaches reamers and springs
   B. Cutlery, screws, rivets and files
   C. Mandrels, twist drills, small lathe tools and razors
   D. Forgings like can shaft, structural steel plate, threading dies and drawing dies

2. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and ___________________?

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

3. Carbon is present in the form of _______________________ in grey cast iron ?

   A. Spheroids
   B. Nodular aggregates of graphite
   C. Flakes
   D. Cementite

4. Shampoos are commercially not available in the form of ___________________?

   A. Powder
   B. Gaseous mixture
   C. Solution
   D. Emulsion

5. In the Bayer’s process, bauxite is digested under pressure using ___________________?

   A. H2SO4
   B. NaOH
   C. NH3
   D. HCl

6. When an isolated thermodynamic system executes a process ___________________?

   A. Work is done
   B. Heat transfer takes place
   C. Mass flow occurs across the boundary of the system
   D. No chemical reaction takes place within the system

7. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?

   A. Lumps
   B. Pellets
   C. Briquettes
   D. Sinter

8. Globular form of cementite is formed during the _________________ process ?

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

9. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element ?

   A. Silicon
   B. Carbon
   C. Phosphorous
   D. Chromium

10. For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?

    A. 30,000 J
    B. 60,000 J
    C. 90,000 J
    D. 2,40,000 J