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Chemical Heat Transfer

Free 509+ Chemical Heat Transfer MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Chemical Heat Transfer — MCQs for Pakistan government job tests

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Chemical Heat Transfer

Practice questions

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1.Identify the incorrect statement from the following:

2.Identify the incorrect statement from the following:

3.Identify the incorrect statement from the following options:

4.Why is a backward feed multiple effect evaporator preferred over a forward feed type when concentrating a cold feed?

5.Which feeding method is most suitable for evaporating a viscous solution in a multiple-effect evaporator?

6.A well-mixed vessel contains 1000 kg of liquid initially at 30°C, which must be heated to 120°C. The heating is done using immersed coils with a surface area of 1.2 m², through which steam condenses at 150°C. Given the overall heat transfer coefficient to the liquid is 1500 W/m²·°C, and the liquid's specific heat capacity is 4 kJ/kg·°C, calculate the time required for the liquid to reach the target temperature. Assume heat losses to the environment are negligible.

7.Which of the following statements about heat waves is true?

8.How does the presence of air (a non-condensable gas) in a vapor stream undergoing condensation impact the vapor's condensation rate?

9.What is true for an ideal transparent material, such as a gas?

10.In a double pipe heat exchanger, fluid flows through the inner tube with diameter 'd'. Under turbulent flow and a constant mass flow rate, the tube-side heat transfer coefficient varies proportionally to which of the following expressions involving 'd'?

11.The heat transfer coefficient (h) for a fluid flowing inside a clean pipe is expressed as h = 0.023 (K/D) (DVρ/μ)^0.8 (CP·μ/k)^0.4. For which Reynolds number (NRe) range is this correlation applicable?

12.What is the name of the dimensionless number defined as the ratio of kinematic viscosity to thermal diffusivity?

13.What causes vibrations in the tubes of a shell and tube heat exchanger?

14.In a single-effect evaporator system, what is the typical value of the steam economy?

15.Using the Dittus-Boelter equation for turbulent flow inside a pipe, if the pipe diameter is reduced to half its original size while the flow rate is increased twofold, by what factor does the heat transfer coefficient change?

16.What is the primary function of baffles in the shell side of a shell-and-tube heat exchanger?

17.Which chart is referred to as the transient heat conduction chart?

18.Which heat transfer film coefficient provides the greatest resistance to heat flow?

19.Which of the following deals with the simultaneous transfer of heat and mass?

20.Duhring's rule is primarily used to address issues related to which process?

How to prepare with Chemical Heat Transfer MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Chemical Heat Transfer appears in real exam conditions.

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