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Chemical Engineering :: Chemical Engineering Basics-2

  1. __________ is the most suitable lubricant for drawing mild steel wires?

  2. A.

     Kerosene

    B.

     Water

    C.

     Sodium stearate

    D.

     Lime water


  3. Maraging steels derive their strength from the following mechanism:

  4. A.

     A fine, highly dislocated and strong martensite

    B.

     Fine dispersions of intermetallics of Fe, Ni, Ti etc

    C.

     Fine dispersions of alloy carbides in a ferrite matrix

    D.

     Fine dispersions of Fe₃ C nucleated on dislocations in austenite


  5. Ignition of fuel in a diesel engine is by

  6. A.

     Spark

    B.

     Hot compressed air

    C.

     Fuel injection

    D.

     None of these


  7. Blast furnace slag is mainly molten

  8. A.

     Sand

    B.

     Magnesium silicate

    C.

     Calcium silicate

    D.

     Iron pyrite


  9. Paint spray gun works on the principle of

  10. A.

     Bernoulli's theorem

    B.

     Boyle's law

    C.

     Newton's law of viscosity

    D.

     None of these


  11. 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

  12. A.

     30000 J

    B.

     60000 J

    C.

     90000 J

    D.

     240000 J


  13. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

  14. A.

     Beryllia

    B.

     Zirconia

    C.

     Alumina

    D.

     Magnesia


  15. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

  16. A.

     Cobalt, chromium & tungsten

    B.

     Cobalt, chromium & nickel

    C.

     Molybdenun, tungsten & chromium

    D.

     Cobalt, zirconium & molybdenum


  17. Which of the following welding processes employs the highest welding temperature ?

  18. A.

     Arc welding

    B.

     Gas welding

    C.

     Thermit welding

    D.

     Resistance welding


  19. Which of the following is a boiler accessory i.e., not a boiler mounting ?

  20. A.

     Blow off cock

    B.

     Feed check valve

    C.

     Feed water pump

    D.

     Stop valve