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 4 of 7

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Q31.
What is the value of surface fluid constant for water-brass combination?

a.

0.004

b.

0.005

c.

0.006

d.

0.007

Discuss
Answer: (c).0.006
Q32.
Spherical bubbles of 3 mm diameter are observed in the bulk fluid boiling of water at standard atmospheric pressure. Assuming pure water vapor in the bubble and vapor pressure equal to 101.325 k N/m², calculate the temperature of the vapor

a.

100.217 degree Celsius

b.

200.217 degree Celsius

c.

300.217 degree Celsius

d.

400.217 degree Celsius

Discuss
Answer: (a).100.217 degree Celsius
Q33.
An electric wire of 1.25 mm diameter and 250 mm long is laid horizontally and submerged in water at 7 bar. The wire has an applied voltage of 2.2 V and carries a current of 130 amperes. If the surface of the wire is maintained at 200 degree Celsius, make calculations for the heat flux

a.

0.0915 * 10⁶ W/m²

b.

0.1915 * 10⁶ W/m²

c.

0.2915 * 10⁶ W/m²

d.

0.3915 * 10⁶ W/m²

Discuss
Answer: (c).0.2915 * 10⁶ W/m²
Q34.
Which of the following parameters affect burnout heat flux in the nucleate boiling region

(i) Heat of evaporation
(ii) Temperature difference
(iii) Density of vapor
(iv) Density of liquid
(v) Surface tension at the vapor-liquid interface

Mark the correct answer from the codes indicated below

a.

i, ii, iii and v

b.

i, iii, iv and v

c.

i, ii, iii and iv

d.

i, iii and v

Discuss
Answer: (b).i, iii, iv and v
Q35.
All the following statements are correct, except

a.

Nucleate boiling gets promoted on a smooth surface

b.

In subcooled heating, the temperature of the heating surface is more than the boiling point of the liquid

c.

Film boiling region is usually avoided in commercial equipment

d.

There occurs transition from nucleate to film boiling burn-out point on the boiling curve

Discuss
Answer: (a).Nucleate boiling gets promoted on a smooth surface
Q36.
Milk spills over when it is boiled in an open vessel. The boiling of milk at this instant is referred to as

a.

Interface evaporation

b.

Sub-cooled boiling

c.

Film boiling

d.

Saturated nucleate boiling

Discuss
Answer: (b).Sub-cooled boiling
Q37.
For laminar film condensation on a vertical plate, the velocity distribution at a distance δ from the top edge is given by

a.

p g (δ y – y/2)/σ

b.

p g (δ y – y²)/σ

c.

p g (δ y – y²/2)/σ

d.

p g (δ – y²/2)/σ

Discuss
Answer: (c).p g (δ y – y²/2)/σ
Q38.
For laminar film condensation on a vertical plate, the mass flow rate of the condensate per unit depth of the film at any position x is given by

a.

p g δ ³/ 3

b.

p g δ³/ 3 σ

c.

p g δ²/ 3 σ

d.

p g δ²/ 3

Discuss
Answer: (b).p g δ³/ 3 σ
Q39.
For laminar film condensation on a vertical plate, the gravitational acceleration g is replaced by

a.

4 g sin α

b.

3 g sin α

c.

2 g sin α

d.

g sin α

Discuss
Answer: (d).g sin α
Q40.
Mark the wrong statement with respect to laminar flow condensation on a vertical plate

a.

The rate of condensation heat transfer is maximum at the upper edge of the plate and progressively decreases as the lower edge is approached

b.

The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate

c.

At a definite point on the heat transfer, the film coefficient is directly proportional to thermal conductivity and inversely proportional to thickness of film at the point

d.

The film thickness increases as the fourth root of the distance down the upper edge

Discuss
Answer: (b).The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate
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