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  1. Presence of sulphur in steel reduces the

  2. A.
    hardness.
    B.
    grain size.
    C.
    tensile strength.
    D.
    toughness & transverse ductility.

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  3. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

  4. A.
    Cresylic acid
    B.
    Xanthaies
    C.
    Pine oil
    D.
    all 'a' 'b' & 'c'

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  5. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

  6. A.
    volume
    B.
    pressure
    C.
    heat
    D.
    none of these

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  7. Fire on fuel oil lines can be extinguished by

  8. A.
    foam
    B.
    steam
    C.
    water
    D.
    carbon dioxide

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  9. In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be

  10. A.
    conduction
    B.
    radiation
    C.
    natural convection
    D.
    forced convection

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  11. Optical activity is a/an __________ property.

  12. A.
    additive
    B.
    constitutive
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  13. Solution loss reaction occurs

  14. A.
    in the blast furnace shaft.
    B.
    during pretreatment of hot metal.
    C.
    in the L.D. process.
    D.
    during deoxidation in the ladle.

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  15. Out of the following materials, the one which generally exhibits an yield point is

  16. A.
    hard bronze
    B.
    soft brass
    C.
    cold rolled mild steel
    D.
    hot rolled mild steel

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  17. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by

  18. A.
    T1/(T1-T2)
    B.
    T2/(T1-T2)
    C.
    T1/T2
    D.
    T2/T1

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