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  • Question
  • Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.


  • Options
  • A. chromium
  • B. nickel
  • C. tungsten
  • D. cobalt

  • Correct Answer
  • cobalt 


  • Materials and Construction problems


    Search Results


    • 1. Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

    • Options
    • A. karbate
    • B. lead or glass
    • C. fireclay bricks
    • D. PVC
    • Discuss
    • 2. The hardest material just prior to diamond in Mho's scale is

    • Options
    • A. topax
    • B. carborundum
    • C. corrundum
    • D. calcite
    • Discuss
    • 3. A suitable material of construction to use with fuming sulphuric acid is

    • Options
    • A. carbon steel
    • B. stainless steel type 304
    • C. nickel
    • D. monel
    • Discuss
    • 4. Liquid ammonia is shipped in __________ containers.

    • Options
    • A. steel
    • B. aluminium
    • C. glass
    • D. lead lined
    • Discuss
    • 5. 18/8 steel is a/an __________ stainless steel.

    • Options
    • A. austenitic
    • B. ferritic
    • C. martensitic
    • D. none of these
    • Discuss
    • 6. Residual magnetism in steel for magnets is increased by the addition of

    • Options
    • A. nickel
    • B. cobalt
    • C. tungsten
    • D. chromium
    • Discuss
    • 7. Constituents of stellite are

    • Options
    • A. zinc, copper and nickel.
    • B. cobalt, chromium and tungsten.
    • C. zinc, aluminium and nickel.
    • D. nickel, cobalt and vanadium.
    • Discuss
    • 8. 'P' is the investment made on an equipment, 'S' is its salvage value and 'n is the life of the equipment in years. The depreciation for rath year by the sum-of years digit method will be

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 9. Out of the following, the depreciation calculated by the __________ method is the maximum.

    • Options
    • A. diminishing balance
    • B. straight line
    • C. sum of the years digit
    • D. sinking fund
    • Discuss
    • 10. Cost of instrumentation in a modern chemical plant ranges from __________ percent of the total plant cost.

    • Options
    • A. 5 to 10
    • B. 20 to 30
    • C. 40 to 50
    • D. 60 to 70
    • Discuss


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