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chemical engineering heat transfer chemical engineering MCQs

Practise multiple-choice questions from chemical engineering heat transfer chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering heat transfer chemical engineering Mcqs
1. The unit of heat transfer co-efficient is_________________?
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A. BTU/hr. F. ft

B. BTU/hr. ft2F

C. BTU/hr. ft

D. BTU/hr. F

2. In a forward feed multiple effect evaporator unit__________________?
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A. None of these

B. Transfer from effect to effect is done by pumps

C. No pump is required to withdraw the product from the last effect

D. Viscosity of liquid is highest in first effect

3. For heat flow through very thick walled cylinder, use ___________mean radius?
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A. Either A. or C.

B. Logarithmic

C. Arithmetic

D. Geometric

4. An ejector is used to__________________?
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A. Increase temperature

B. None of these

C. Remove condensate

D. Increase pressure

5. Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is__________________?
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A. 0.5

B. 10

C. 2

D. 100

6. Multiple effect evaporation accounts for___________________?
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A. None of these

B. Lower operating costs

C. Steam economy

D. Investment economy

7. Nucleate boiling is promoted ___________________?
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A. On rough surfaces

B. None of these

C. On polished surfaces

D. In the absence of agitation

8. During crystallisation, formation of crystal can occur in ______________ solution only?
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A. Saturated

B. All A., B. and C.

C. Supersaturated

D. Under-saturated

9. The range of electromagnetic spectrum important in heat transfer by radiation is ______________ microns?
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A. 0.38-0.78

B. May-50

C. 100-1000

D. 0.5-50
10. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?
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A. Either more or less than (depending upon the fluid)

B. Equal to

C. More than

D. Less than

11. In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?
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A. Remain constant

B. Increases

C. May increase or decrease, depends on the vacuum

D. Decreases

12. A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?
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A. Higher solute concentration in the product

B. Lower steam economy

C. Higher steam economy

D. Lower heat transfer area

13. Prandtl number is given by__________________?
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A. ?/h CP

B. CP ?/k

C. hD/k

D. CP ?/a

14. In pipe flow, heat is transferred from hot wall to the liquid by__________________?
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A. Forced convection only

B. Conduction only

C. Forced convection and conduction

D. Free and forced convection

15. In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid___________________?
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A. Varies as square of the area

B. Directly proportional to LMTD and inversely proportional to the area

C. Varies directly as the area and the LMTD

D. None of these

16. The absorptivity of a body is equal to its emissivity _________________?
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A. At a particular temperature

B. Under thermal equilibrium

C. None of these

D. For circular bodies

17. Viscosity of gases ______________ with increase in temperature?
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A. Increase very rapidly

B. Decrease slowly

C. Increase slowly

D. Remain unaffected

18. Use of transverse baffles in a shell and tube heat exchanger is done to increase the___________________?
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A. Flow velocity

B. All A., B. and C.

C. Rate of heat transfer

D. Turbulence of shell side fluid

19. For a multipass shell and tube heat exchanger, the LMTD correction factor is always________________?
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A. < 1

B. Between 1 & 2

C. > 1

D. 1

20. Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2.C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the_________________?
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A. Lower pressure drop through the exchanger is desired

B. Higher condensing film co-efficient is desired

C. Condensate is corrosive in nature

D. Temperature of the incoming vapor is very high