Condensation And Boiling MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Condensation And Boiling, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Condensation And Boiling MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Condensation And Boiling mcq questions that explore various aspects of Condensation And Boiling problems. Each MCQ is crafted to challenge your understanding of Condensation And Boiling principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Condensation And Boiling MCQs are your pathway to success in mastering this essential Heat Transfer topic.

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Condensation And Boiling MCQs | Page 5 of 7

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Q41.
A plate condenser of dimensions l * b has been designed to be kept with side l in the vertical position. However due to oversight during erection and installation, it was fixed with side b vertical. How would this affect the heat transfer? Assume laminar conditions and same thermos-physical properties and take b = l/2

a.

The condenser should be installed with shorter side horizontal

b.

The condenser should be installed with longer side horizontal

c.

The condenser should be installed with longer side vertical

d.

The condenser should be installed with shorter side vertical

Discuss
Answer: (d).The condenser should be installed with shorter side vertical
Q42.
Determine the length of a 25 cm outer diameter tube if the condensate formed on the surface of the tube is to be same whether it is kept vertical or horizontal

a.

61.5 cm

b.

71.5 cm

c.

81.5 cm

d.

91.5 cm

Discuss
Answer: (b).71.5 cm
Q43.
The critical Reynolds number for transition from laminar to turbulent film condensation is

a.

2000

b.

1900

c.

1800

d.

1700

Discuss
Answer: (c).1800
Q44.
Which of the following is a wrong statement in the context of a convective heat transfer coefficient in laminar film condensation?

The heat transfer coefficient varies as

a.

– ¼ power of acceleration due to gravity

b.

½ power of density of liquid

c.

¼ power of enthalpy of evaporation

d.

– ½ power of dynamic viscosity

Discuss
Answer: (a).– ¼ power of acceleration due to gravity
Q45.
Which parameter is responsible for commencement of the turbulent flow?

a.

Fourier number

b.

Reynolds number

c.

Stanton number

d.

Nusselt number

Discuss
Answer: (b).Reynolds number
Q46.
The transition from laminar to turbulent flow occurs at a critical Reynolds number of

a.

1800

b.

2200

c.

2600

d.

3000

Discuss
Answer: (a).1800
Q47.
A condenser is to be designed to condense 225.0 kg of steam per hour at a pressure of 0.15 bar. A square array of 400 tubes, each of 6 mm in diameter, is available for the task. If the tube surface temperature is to be maintained at 26 degree Celsius, make calculations for the length of the tube

a.

4.353 m

b.

3.353 m

c.

2.353 m

d.

1.353 m

Discuss
Answer: (d).1.353 m
Q48.
The outer surface of a vertical tube is 1.25 m long and outer diameter is 50 mm is exposed to saturated steam at atmospheric pressure. If the tube surface is maintained at 80 degree Celsius by the flow of cooling water through it, determine the rate of heat transfer to the coolant

a.

47648 W

b.

12345 W

c.

19879 W

d.

97123 W

Discuss
Answer: (c).19879 W
Q49.
What is the value of characteristics length in turbulent film condensation?
(Where, δ is length of the plate)

a.

δ

b.

3 δ

c.

2 δ

d.

4 δ

Discuss
Answer: (d).4 δ
Q50.
What is the value of Reynolds number in terms of mass flow rate?
(Where, δ is length of the plate and b is width of the plate)

a.

4 m/δ b

b.

2 m/δ b

c.

3 m/δ b

d.

m /δ b

Discuss
Answer: (a).4 m/δ b
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