Heat Transfer Chemical Engineering Online Questions - Set 13 - ObjectiveBooks

Heat Transfer Chemical Engineering Online Questions - Set 13

Practice Test: Question Set - 13

1. At constant temperature, the thermal conductivities of gases __________ with rise in pressure.
    (A) Decrease
    (B) Increase
    (C) Remain unchanged
    (D) May increase or decrease; depends on the pressure

2. Stefan-Boltzmann law applies to __________ body.
    (A) Black
    (B) White
    (C) Grey
    (D) Any color

3. When warm and cold liquids are mixed, the heat transfer is mainly by
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Both (a) & (c)

4. A BTU/hr.ft.2 °F is equal to
    (A) 1 kcal/hr. m2°C
    (B) 4.88 kcal/hr. m.2°C
    (C) 1 kcal/hr. m2.°K
    (D) None of these

5. Open pan evaporators are preferred to be used, when the solution to be concentrated is
    (A) Scaling
    (B) Highly viscous
    (C) Corrosive
    (D) Salty

6. A __________ evaporator employs an annular downtake.
    (A) Basket type
    (B) Horizontal
    (C) Long tube vertical
    (D) None of these

7. The equation, Nst = (f/2)/[1 + 5 (Npr - 1) √(f/2)], corresponds to __________ analogy.
    (A) Von-Karman
    (B) Reynolds
    (C) Colburn
    (D) Prandtl

8. The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is
    (A) Lower tube side pressure drop
    (B) Lower shell side pressure drop
    (C) Higher tube side heat transfer co-efficient
    (D) Higher shell side heat transfer co-efficient

9. With increase in temperature, the thermal conductivity of fresh lubricating oil
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) May increase or decrease; depends on its composition

10. Vent pipes are provided in a condenser to
    (A) Remove non-condensable gases
    (B) Purge the condenser
    (C) Facilitate easy cleaning of tubes
    (D) None of these

11. To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is
    (A) 1-2 heat exchanger
    (B) 1-1 heat exchanger
    (C) 3-2 heat exchanger
    (D) 2-4 heat exchanger

12. LMTD for counter-flow and parallel flow heat exchanger will be the same, when the
    (A) Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
    (B) Outlet temperature of both the hot and cold fluid are same
    (C) Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
    (D) None of these

13. In case of __________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface.
    (A) Nucleate
    (B) Local
    (C) Pool
    (D) Saturated

14. Steam trap is used to
    (A) Condense the steam flowing in the pipeline
    (B) Remove water resulting from partial condensation of steam
    (C) Stop the supply of steam
    (D) None of these

15. For __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.
    (A) Extremely low
    (B) Low
    (C) High
    (D) No

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