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Chemical Engineering Basics-2 - Section-1
  1. Consumable electrodes are used in the __________ welding.

    2. A.

     Gas
    B.

     Arc
    C.

     Thermit
    D.

     Resistance

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  2. Nusselt number/Biot number varies

    3. A.

     Inversely with thermal conductivity
    B.

     Directly with heat transfer co-efficient
    C.

     Directly with thermal conductivity
    D.

     Inversely with the dimension of the solid

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  3. The same volume of all gases is representative of their

    4. A.

     Specific gravities
    B.

     Densities
    C.

     Gas characteristic constants
    D.

     Molecular weights

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  4. The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

    5. A.

     More
    B.

     Less
    C.

     Same
    D.

     More but less than the diameter of bolt

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  5. Silicon in steel

    6. A.

     Makes it usable in almost all magnetic circuits where alternating current is used
    B.

     Increases its electrical resistivity and decreases the hysteresis loss
    C.

     Is present upto 5% & 4% respectively when used in transformers & motor armatures
    D.

     All of the above

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  6. Carbon supply in pack carburising process is in the form of

    7. A.

     Charcoal
    B.

     Calcium carbide
    C.

     Hydrocarbon oil
    D.

     Graphite

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  7. The two elements required to form substitutional solid solution should not have

    8. A.

     Same crystalline structure
    B.

     Same valancy
    C.

     Widely differing electronegativity
    D.

     Same atomic sizes

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  8. Solution loss reaction occurs

    9. 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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  9. The bulk modulus of a material with Poisson's ratio of 0.5 is equal to

    10. A.

     3 x Young's modulus
    B.

     Young's modulus
    C.

     Infinity
    D.

     Zero

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

    11. A.

     6:1
    B.

     12 : 1
    C.

     18 : 1
    D.

     24 : 1

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