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  1. Aromatics are desired constituents of

  2. A.
    lubricating oil
    B.
    diesel
    C.
    kerosene
    D.
    petrol

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  3. Galvanic corrosion

  4. A.
    occurs in a bimetal couple.
    B.
    occurs in highly stressed metallic parts only.
    C.
    is exemplified by caustic embrittlement of boiler tubes.
    D.
    is also called dezincification.

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  5. Increasing the temperature of a material makes it

  6. A.
    harder
    B.
    softer
    C.
    tougher
    D.
    stronger

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  7. Which of the following absorbs maximum heat in a high pressure boiler ?

  8. A.
    Economiser
    B.
    Steam superheater
    C.
    Air preheater
    D.
    Furnace water wall

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  9. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

  10. A.
    x1.5
    B.
    x0.8
    C.
    x-1.5
    D.
    x-0.8

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  11. __________ cycle is the most efficient thermodynamic cycle.

  12. A.
    Diesel
    B.
    Otto
    C.
    Rankine
    D.
    Carnot

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  13. Dew point of air indicates its

  14. A.
    moisture content
    B.
    dryness
    C.
    latent heat
    D.
    coolness

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  15. Out of the following, __________ waves have the largest wavelength.

  16. A.
    radio
    B.
    light
    C.
    X-ray
    D.
    Gamma-ray

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  17. Pick the odd man out of the following.

  18. A.
    Calorising
    B.
    Pack carburising
    C.
    Nitriding
    D.
    Cyaniding

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  19. A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.

  20. A.
    0.01
    B.
    0.1
    C.
    0.25
    D.
    0.5

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