Basic Heat transfer Chemical Engineering Questions - Set 29 - ObjectiveBooks

Basic Heat transfer Chemical Engineering Questions - Set 29

Practice Test: Question Set - 29

1. Fouling factor
    (A) Is a dimensionless quantity
    (B) Does not provide a safety factor for design
    (C) Accounts for additional resistances to heat flow
    (D) None of these

2. Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.
    (A) 0.4 - 0.6
    (B) 1-1.3
    (C) 1.8-2
    (D) 2 - 2.4

3. As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient
    (A) Continues to increase
    (B) Continues to decrease
    (C) Goes through a minimum
    (D) Goes through a maximum

4. Thermal conductivities of most of the liquids __________ with rise in temperature.
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) May increase or decrease; depends on the liquid

5. The equivalent diameter for pressure drop is __________ that for heat transfer.
    (A) Smaller than
    (B) Greater than
    (C) Equal to
    (D) Not related with

6. The purpose of providing a 'catchall' in the vapor line of an evaporator is to
    (A) Create vacuum
    (B) Regulate the vapor flow
    (C) Vent the non-condensable gases
    (D) Arrest the entrained liquid

7. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?
    (A) Bleed point
    (B) Vent
    (C) Catchall
    (D) Baffle

8. Removal of __________ heat is involved in the condensation of a vapor under saturated conditions.
    (A) Super
    (B) Sensible
    (C) Latent
    (D) Both (b) & (c)

9. In a heat exchanger, floating head is provided to
    (A) Facilitate cleaning of the exchanger
    (B) Increase the heat transfer area
    (C) Relieve stresses caused by thermal expansion
    (D) Increase log mean temperature gradient

10. The energy radiated from a surface Q at absolute temperature T is related as
    (A) Q  T2
    (B) Q  T4
    (C) Q  T3
    (D) None of these

11. Electromagnetic radiations propagate in vacuum with a velocity of __________ meter/second.
    (A) 3 × 105
    (B) 3 × 108
    (C) 3 × 1010
    (D) 3 × 1012

12. Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity?
    (A) Aluminium foil
    (B) Refractory bricks
    (C) Iron plate
    (D) Coke breeze

13. With the increase of temperature, the Col-burn jH factor
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) May increase or decrease; depending on temperature

14. Crystallization of solids from a homogeneous solution is a/an __________ process.
    (A) Exothermic
    (B) Mildly endothermic
    (C) Highly endothermic
    (D) None of these

15. Pick out the wrong statement.
    (A) Heat transfer by radiation cannot occur across an absolute volume
    (B) In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles
    (C) Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light
    (D) The amount of heat involved in the condensation or vaporization of 1 kg of a fluid is the same

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