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GATE 2017-2018 :: GATE Chemical

  1. The local velocity of a fluid along a streamline can be measured by
  2. A.
    Pitot tube
    B.
    Venturi meter
    C.
    Rotameter
    D.
    Orifice meter

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  3. In a mixing tank operating at very high Reynolds number (> 104), if the diameter of the impeller is doubled (other conditions remaining constant), the power required increases by a factor of
  4. A.
    1/32
    B.
    1/4
    C.
    4
    D.
    32

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  5. For heat transfer across a solid-fluid interface, which one of the following statements is NOT true when the Biot number is very small compared to 1?
  6. A.
    Conduction resistance in the solid is very small compared to convection resistance in the fluid
    B.
    Temperature profile within the solid is nearly uniform
    C.
    Temperature drop in the fluid is significant
    D.
    Temperature drop in the solid is significant

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  7. A solid sphere with an initial temperature Ti is immersed in a large thermal reservoir of temperature T0. The sphere reaches a steady temperature after a certain time t1. If the radius of the sphere is doubled, the time required to reach steady-state will be
  8. A.
    t1/4
    B.
    t1/2
    C.
    2t1
    D.
    4t1

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  9. In the McCabe-Thiele diagram, if the x -coordinate of the point of intersection of the q -line and the vapor-liquid equilibrium curve is greater than the x -coordinate of the feed point, then the quality of the feed is
  10. A.
    super-heated vapor
    B.
    liquid below bubble point
    C.
    saturated vapor
    D.
    saturated liquid

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  11. For which of the following combinations, does the absorption operation become gas-film controlled? 
    P. The solubility of gas in the liquid is very high 
    Q. The solubility of gas in the liquid is very low 
    R. The liquid-side mass transfer coefficient is much higher than the gas-side mass transfer coefficient 
    S. The liquid-side mass transfer coefficient is much lower than the gas-side mass transfer coefficient
  12. A.
    P & Q
    B.
    P & R
    C.
    P & S
    D.
    Q & R

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  13. The half-life of an nth order reaction in a batch reactor depends on
  14. A.
    only the rate constant
    B.
    only the rate constant and the order of the reaction
    C.
    only the rate constant and the initial reactant concentration
    D.
    the rate constant, initial reactant concentration, and the order of the reaction

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  15. Consider the reaction scheme shown below 

    Both the reactions are first-order. The activation energies for k1 and k2 are 80 and 20 kJ/mol, respectively. To maximize the yield of B, it is preferable to use
  16. A.
    CSTR and high temperature
    B.
    PFR and high temperature
    C.
    CSTR and low temperature
    D.
    PFR and low temperature

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  17. In petroleum refining, catalytic reforming is used to convert
  18. A.
    Paraffins and naphthenes to aromatics
    B.
    Paraffins to hydrogen and carbon monoxide
    C.
    Gas oil to diesel and gasoline
    D.
    Light olefins to gasoline

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  19. The final boiling points of gasoline, diesel, atmospheric gas oil (AGO) and lubricating oils vary as
  20. A.
    gasoline > diesel > AGO > lubricating oils
    B.
    lubricating oils > AGO > diesel > gasoline
    C.
    AGO > lubricating oils > diesel > gasoline
    D.
    lubricating oils > diesel > AGO > gasoline

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