Condensation And Boiling


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10 Questions MCQ Test Additional Documents & Tests for Mechanical Engineering | Condensation And Boiling

Condensation And Boiling for Mechanical Engineering 2022 is part of Additional Documents & Tests for Mechanical Engineering preparation. The Condensation And Boiling questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Condensation And Boiling MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Condensation And Boiling below.
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Condensation And Boiling - Question 1

Nusselt number in Boiling and Condensation process is prescribed by the function

Detailed Solution for Condensation And Boiling - Question 1

For condensation or boiling, the convection coefficient depends upon ΔT = (Tw- Tsat), the body force arising from the liquid-vapour density difference, g ( ρi - pv) , the latent heat hfg, the surface tension σ, a characteristic length L and the thermophysical properties of the liquid or vapour p, cp, μ, and K. From dimensionless analysis,

Condensation And Boiling - Question 2

Which of the above statements are valid?

Condensation And Boiling - Question 3

 All of the following assumptions for Nusselt’s theory of laminar film condensation on a vertical plate is correct except

Detailed Solution for Condensation And Boiling - Question 3

Condensation And Boiling - Question 4

Consider boiling curve for pool boiling of water at saturation temperature and atmospheric pressure and match the following

Detailed Solution for Condensation And Boiling - Question 4

III Transition boiling
IV Film boiling Point

P→ Maximum / Critical heat flux or Burnout point
Point Q → Minimum heat flux (Leidenfrost point) Point Pis also known as boiling crisis indicating the onset of departure from nucleate boiling.

 

Condensation And Boiling - Question 5

The convective coefficients for boiling and condensation usually lie in the range (W/m2-K)

Condensation And Boiling - Question 6

Dropwise condensation usually occurs on

Condensation And Boiling - Question 7

Consider the following statements:
1. If a condensing liquid does not wet a surface, then dropwise condensation will not take place un it:
2. Dropwise condensation gives a higher transfer rate than filmwise condensation.
3. Reynolds number of condensing liquid is based on its mass flow.
4. Suitable coating or vapour additive is used to promote filmwise condensation.

Which of these statements are correct?

Condensation And Boiling - Question 8

5 In condensation over a vertical surface, the value of convection coefficient varies as

Where k is the thermal conductivity of the liquid

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The average heat transfer coefficient is given by

Condensation And Boiling - Question 9

Which of the followings is a wrong statement in the context of convective heat transfer coefficient in laminar film condensation?The heat transfer coefficient varies as

Detailed Solution for Condensation And Boiling - Question 9

From this equation:

Condensation And Boiling - Question 10

For filmwise condensation on a vertical plane; the film thickness 5 and heat transfer coefficient h vary with distance* from the leading edge as

Detailed Solution for Condensation And Boiling - Question 10

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