Diffusion in Solids,Liquids and Gases MCQs

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

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Diffusion in Solids,Liquids and Gases MCQs | Page 4 of 8

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Q31.
For the free convection circumstances, the following dimensionless numbers apply

(i) Grashof number
(ii) Prandtl number
(iii) Nusselt number

Identify the correct answer.

a.

ii and iii

b.

ii only

c.

i and ii

d.

i, ii and iii

Discuss
Answer: (d).i, ii and iii
Q32.
Two horizontal steam mains with diameters 5 cm and 15 cm are to be laid in a boiler house that any mutual heat effect is precluded. The mains are at the same surface temperature of 500 degree Celsius whilst the ambient air is at 50 degree Celsius. Workout the ratios of the heat transfer coefficients.

a.

0.136

b.

1.316

c.

2.136

d.

3.136

Discuss
Answer: (b).1.316
Q33.
Two horizontal steam mains with diameters 5 cm and 15 cm are to be laid in a boiler house that any mutual heat effect is precluded. The mains are at the same surface temperature of 500 degree Celsius whilst the ambient air is at 50 degree Celsius. Workout the heat losses from one meter length of the mains

a.

0.458

b.

0.448

c.

0.438

d.

0.428

Discuss
Answer: (c).0.438
Q34.
A spherical heater of 20 cm diameter and at 60 degree Celsius is immersed in a tank of water at 20 degree Celsius. Determine the value of convective heat transfer coefficient

a.

458.32 W/m² K

b.

558.32 W/m² K

c.

658.32 W/m² K

d.

758.32 W/m² K

Discuss
Answer: (a).458.32 W/m² K
Q35.
A steam pipe 50 mm diameter and 2.5 m long has been placed horizontally and exposed to still air at 25 degree Celsius. If the pipe wall temperature is 295 degree Celsius, determine the rate of heat loss. At the mean temperature difference of 160 degree Celsius, the thermo-physical properties of air are

k =3.64 * 10โป² W/m K
v =30.09 * 10โปโถ m²/s
P แตฃ =0.682
ฮ’ =1/160 + 273 = 2.31 * 10โป³ per K

a.

1156.5 W

b.

1146.5 W

c.

1136.5 W

d.

1126.5 W

Discuss
Answer: (d).1126.5 W
Q36.
A steam pipe 50 mm diameter and 2.5 m long has been placed horizontally and exposed to still air at 25 degree Celsius. If the pipe wall temperature is 295 degree Celsius, find out the Grashof number. At the mean temperature difference of 160 degree Celsius, the thermo-physical properties of air are

k =3.64 * 10โป² W/m K
v =30.09 * 10โปโถ m²/s
P แตฃ =0.682
ฮ’ =1/160 + 273 = 2.31 * 10โป³ per K

a.

0.8447 * 10 โต

b.

0.8447 * 10 โถ

c.

0.8447 * 10 โท

d.

0.8447 * 10 โธ

Discuss
Answer: (b).0.8447 * 10 โถ
Q37.
Estimate the heat transfer from a 40 W incandescent bulb at 125 degree Celsius to 25 degree Celsius in quiescent air. Approximate the bulb as a 50 mm diameter sphere. The approximate correlation for the convection coefficient is
Nu = 0.60 (Gr Pr)^ 0.25

Where the different parameters are evaluated at the mean film temperature, and characteristics length is the diameter of the sphere.

a.

4.71 W

b.

5.71 W

c.

6.71 W

d.

7.71 W

Discuss
Answer: (d).7.71 W
Q38.
A 40 W incandescent bulb at 125 degree Celsius to 25 degree Celsius in quiescent air. Approximate the bulb as a 50 mm diameter sphere. The approximate correlation for the convection coefficient is
Nu = 0.60 (Gr Pr)^ 0.25

Where the different parameters are evaluated at the mean film temperature, and characteristics length is the diameter of the sphere.

Find what percent of power is lost by free convection?

a.

19.478%

b.

19.378%

c.

19.278%

d.

19.178%

Discuss
Answer: (c).19.278%
Q39.
More than one tie line is represented in an equilibrium triangular system is known as

a.

Single stage extractor

b.

Multistage extractor

c.

Single stage cascades

d.

None of the mentioned

Discuss
Answer: (b).Multistage extractor
Q40.
Find the slope of the operating line for the first stage if the dilutant in the feed is 5 kg and the solvent used for the second stage is 10 kg.

a.

0.5

b.

2

c.

2.5

d.

Data inadequate

Discuss
Answer: (d).Data inadequate
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