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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Heat Transfer  >  Test: Bubble Growth - Mechanical Engineering MCQ

Test: Bubble Growth - Mechanical Engineering MCQ


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10 Questions MCQ Test Heat Transfer - Test: Bubble Growth

Test: Bubble Growth for Mechanical Engineering 2024 is part of Heat Transfer preparation. The Test: Bubble Growth questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Bubble Growth MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Bubble Growth below.
Solutions of Test: Bubble Growth questions in English are available as part of our Heat Transfer for Mechanical Engineering & Test: Bubble Growth solutions in Hindi for Heat Transfer course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Bubble Growth | 10 questions in 10 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Heat Transfer for Mechanical Engineering Exam | Download free PDF with solutions
Test: Bubble Growth - Question 1
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The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by

Detailed Solution for Test: Bubble Growth - Question 1

It is given by Fritz, an American scientist.

Test: Bubble Growth - Question 2
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The nucleate pool boiling is influenced by the following factors
(i) Pressure
(ii) Liquid properties
(iii) Material
Identify the correct statements

Detailed Solution for Test: Bubble Growth - Question 2

It depends on pressure, material and liquid properties.

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Test: Bubble Growth - Question 3
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Consider the following phenomena
(i) Boiling
(ii) Free convection in air
(iii) Forced convection in air
(iv) Conduction in air
Identify the correct sequence (heat transfer coefficient)

Detailed Solution for Test: Bubble Growth - Question 3

Heat transfer coefficient is maximum for conduction in air and is least for boiling.

Test: Bubble Growth - Question 4
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The bubble diameter at the time of detachment from the surface can be worked out from the relation proposed by Fritz and is given by

Where, β is the angle of contact
Detailed Solution for Test: Bubble Growth - Question 4

The constant C d has the value 0.0148 for water bubbles.

Test: Bubble Growth - Question 5
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In spite of large heat transfer coefficient in boiling liquids, fins are used advantageously when the entire surface is exposed to
Detailed Solution for Test: Bubble Growth - Question 5

Here all modes of boiling i.e. film, transition and nucleate are of great importance.

Test: Bubble Growth - Question 6
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With increase in excess temperature, the heat flux in boiling
Detailed Solution for Test: Bubble Growth - Question 6

It first increases to 50% then decreases not to zero and again increases to its maximum value.

Test: Bubble Growth - Question 7
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The excess temperature range 50 degree Celsius < d t < 200 degree Celsius is indicative of the region of
Detailed Solution for Test: Bubble Growth - Question 7

The physical phenomenon of pool boiling is generally divided into four different regions based on the excess temperature.

Test: Bubble Growth - Question 8
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Heat flux increases with temperature excess beyond the Leiden-frost point due to
Detailed Solution for Test: Bubble Growth - Question 8

Heat flux increases with temperature excess beyond the Leiden-frost point due to radiation effect becomes predominant.

Test: Bubble Growth - Question 9
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Leiden-frost expansion is related to
Detailed Solution for Test: Bubble Growth - Question 9

It is related to boiling of liquid on a hot surface.

Test: Bubble Growth - Question 10
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Consider the following statements regarding nucleate boiling
(i) The temperature of the surface is greater than the saturation temperature of the liquid
(ii) Bubbles are created by the expansion of entrapped gas oil vapor at small cavities in the surface
(iii) The temperature is greater than that in film boiling
(iv) The heat transfer from the surface to the liquid is greater than that in the film boiling
Which of these statements are correct?
Detailed Solution for Test: Bubble Growth - Question 10

The temperature must be less than that in film boiling.

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