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  1. In chemical dehumidification process

  2. A.
    wet bulb temperature increases.
    B.
    dry bulb temperature remains constant.
    C.
    dew point temperature increases.
    D.
    dry bulb temperature increases.

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  3. Secondary hardening in steels arises out of the

  4. A.
    precipitation of fine alloy carbides at high temperatures.
    B.
    refinement of ferrite grain size by working.
    C.
    decomposition of retained austenite upon heat treatment.
    D.
    precipitation of complex inter-metal-lics upon heat treatment.

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  5. Drills are usually made of

  6. A.
    cermets
    B.
    high speed steel
    C.
    alloy steel
    D.
    tungsten carbide

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  7. Tumbling is the process of improving the __________ of the materials/parts.

  8. A.
    surface finish
    B.
    fatigue limit
    C.
    creep limit
    D.
    surface cleanlineses

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  9. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

  10. A.
    flow output
    B.
    head developed
    C.
    overall efficiency
    D.
    weight

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  11. __________ of air does not increase with increase in temperature.

  12. A.
    Density
    B.
    Thermal diffusivity
    C.
    Viscosity
    D.
    Thermal conductivity

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  13. Spherical shape of mercury droplets is due to its

  14. A.
    high viscosity.
    B.
    low surface tension.
    C.
    high density.
    D.
    high surface tension.

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  15. Sub zero treatment of steel is done to

  16. A.
    suppress martensite transformation.
    B.
    enhance its working performance in sub zero atmosphere.
    C.
    reduce the retained austenite in hardened steel.
    D.
    induce temper brittleness after its hardening.

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  17. Air-petrol ratio for maximum power generation in spark ignition engine is about

  18. A.
    6:1
    B.
    12 : 1
    C.
    18 : 1
    D.
    24 : 1

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  19. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?

  20. A.
    Output & fineness
    B.
    Velocity
    C.
    Both (a) & (b)
    D.
    None of these

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