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Chemical Engineering :: Heat Transfer

  1. 1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

  2. A.
    1.49
    B.
    1
    C.
    4.88
    D.
    none of these

  3. Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on

  4. A.
    T1 - T2
    B.
    T1 - Ta
    C.
    T2 - Ta
    D.
    none of these

  5. The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

  6. A.
    Prandtl
    B.
    Nusselt
    C.
    Stanton
    D.
    Grashoff

  7. For a perfectly transparent surface (like gases), the

  8. A.
    absorptivity = 0
    B.
    transmissivity = 1
    C.
    reflectivity = 0
    D.
    all (a), (b) & (c)

  9. For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

  10. A.
    same
    B.
    different
    C.
    never different
    D.
    linearly related

  11. During crystallisation, formation of crystal can occur in __________ solution only.

  12. A.
    saturated
    B.
    supersaturated
    C.
    undersaturated
    D.
    all (a), (b) and (c)

  13. An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

  14. A.
    4000
    B.
    9000
    C.
    4600
    D.
    3000

  15. An insulator should have

  16. A.
    low thermal conductivity.
    B.
    high thermal conductivity.
    C.
    less resistance to heat flow.
    D.
    a porous structure.

  17. In a backward feed multiple effect evaporator

  18. A.
    feed is introduced in the first effect.
    B.
    feed flows from low pressure to high pressure.
    C.
    no pumps are required between successive effects.
    D.
    none of these.