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  1. Silicon percentage in acid resistant cast iron is about

  2. A.
    4
    B.
    8
    C.
    14
    D.
    20

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  3. Thermal expansion of solid is employed in the temperature measurement by a

  4. A.
    bimetallic thermometer.
    B.
    thermocouple.
    C.
    mercury thermometer.
    D.
    resistance thermometer.

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  5. Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material.

  6. A.
    one
    B.
    two
    C.
    three
    D.
    four

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  7. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the

  8. A.
    work hardening.
    B.
    Bauschinger effect.
    C.
    creeping effect.
    D.
    stress recovery effect.

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  9. Function of fusible plug in a boiler is to

  10. A.
    drain out water and sludge from the boiler during repair.
    B.
    put off fire in the furnace when water level in the boiler falls to unsafe limit.
    C.
    guard the boiler in case of abnormal rise in steam pressure.
    D.
    all (a), (b) & (c).

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  11. What is the range of tempering temperature (°C) for most of the materials ?

  12. A.
    75-100
    B.
    200-300
    C.
    350-450
    D.
    500-600

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  13. Absorptivity of a grey body varies with the

  14. A.
    wavelength of the incident ray.
    B.
    temperature
    C.
    both'a' & 'b'
    D.
    neither 'a' nor 'b'

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  15. In radiative heat transfer, a grey surface is the one, which has

  16. A.
    emissivity independent of wavelength.
    B.
    grey appearance to the eye.
    C.
    zero reflectivity.
    D.
    equal brightness in all directions.

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  17. Overheating of satellites during re-entry to earth is controlled by

  18. A.
    thick insulation.
    B.
    ceramic lining.
    C.
    cooling by flow of air over the surface.
    D.
    none of these.

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  19. The most abundant metal present in the earth's crust is;

  20. A.
    iron
    B.
    copper
    C.
    titanium
    D.
    aluminium

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