Explore topic-wise MCQs in Heat Transfer.

This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

As the liquid condenses and flows down the condenser wall, the film thickness _________ and the heat transfer coefficient _________

A. Increases, decreases
B. Increases, Increases
C. Decreases, Increases
D. Decreases, decreases
Answer» B. Increases, Increases
Discussion
2.

For pure vapour as well as mixed liquid, the condensation is isothermal.

A. True
B. False
Answer» C.
Discussion
3.

Frictional losses in condensers is usually ____________

A. Very high
B. Very low
C. Low
D. Negligible or 0
Answer» C. Low
Discussion
4.

In a vertical setup of a Condenser, the value of convective heat transfer coefficient depends on the thermal conductivity as ___________

A. k0.25
B. k0.33
C. k0.75
D. k-0.5
Answer» D. k-0.5
Discussion
5.

What is the ratio of convective heat transfer coefficients of a inclined condenser to a vertical condenser?

A. \(\frac{h_{INC}}{h_{VER}}\) = cosec⁡α0.25
B. \(\frac{h_{INC}}{h_{VER}}\) = cos⁡α
C. \(\frac{h_{INC}}{h_{VER}}\) = sin⁡α0.25
D. \(\frac{h_{INC}}{h_{VER}}\) = tan⁡α0.25
Answer» D. \(\frac{h_{INC}}{h_{VER}}\) = tan⁡α0.25
Discussion
6.

If we place a condenser at an angle of α to the vertical, then the convective heat transfer coefficient can be represented as ____________

A. hINC = 0.943 \(0.943[\frac{K^3 p^2 g h_{fg}}{\mu L(T_{sat} – T_L)}sin⁡\alpha]^{0.25}\)
B. hINC = 0.943 \(0.943[\frac{K^3 p^2 g h_{fg}}{\mu L(T_{sat} – T_L)}tan\alpha]^{0.25}\)
C. hINC = 0.943 \(0.943[\frac{K^3 p^2 g h_{fg}}{\mu L(T_{sat} – T_L)}cos⁡\alpha]^{0.25}\)
D. hINC = 0.943 \(0.943[\frac{K^3 p^2 g h_{fg}}{\mu L(T_{sat} – T_L)}cosec⁡\alpha]^{0.25}\)
Answer» B. hINC = 0.943 \(0.943[\frac{K^3 p^2 g h_{fg}}{\mu L(T_{sat} – T_L)}tan\alpha]^{0.25}\)
Discussion
7.

A plate condenser is usually designed to be kept vertical. How would the condensation coefficient change if due to site constraints it now has to be kept at an angle of 30o to the horizontal?

A. 1.53% reduction in condensation coefficient
B. 50% reduction in condensation coefficient
C. 16% reduction in condensation coefficient
D. 84% reduction in condensation coefficient
Answer» D. 84% reduction in condensation coefficient
Discussion
8.

Which one of the following is the correct classification of condensation process?

A. Batch and Semi-batch condensation
B. Drop-wise and Film-wise condensation
C. Boundary layer and Thermal layer condensation
D. Nucleate and non-nucleate condensation
Answer» C. Boundary layer and Thermal layer condensation
Discussion
9.

Which one of the following is not correct about the condensation regimes in a condenser?

A. If a condensing liquid does not wet a surface, then drop wise condensation will not take place on it
B. Drop-wise condensation gives a higher heat transfer rate than film wise condensation
C. Reynolds number of condensing liquid is based on its mass flow rate of the outgoing condensed fluid
D. Suitable coating or vapour additive is used to promote film wise condensation
Answer» E.
Discussion
10.

Which one of the following condensation phenomenon is usually avoided in Condensers?

A. Drop-wise condensation
B. Film condensation
C. Boundary layer condensation
D. Horizontal surface Drop-wise condensation
Answer» C. Boundary layer condensation
Discussion
11.

The convective heat transfer coefficients for condensation in Condensers usually lie in the range ____________

A. 0-200 W/m2K
B. 60-300 W/m2K
C. 300-1000 W/m2K
D. 2500-6000 W/m2K
Answer» E.
Discussion
12.

Which one of the following best describes the function of a condenser?

A. Solid feed to a liquid phase product
B. Vapour feed to a liquid phase product
C. Liquid feed to a solid phase product
D. Liquid feed to a vapour phase product
Answer» C. Liquid feed to a solid phase product
Discussion