Convective Heat Transfer MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Convective Heat Transfer, 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 Convective Heat Transfer 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 Convective Heat Transfer mcq questions that explore various aspects of Convective Heat Transfer problems. Each MCQ is crafted to challenge your understanding of Convective Heat Transfer 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 Convective Heat Transfer MCQs are your pathway to success in mastering this essential Heat Transfer topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Convective Heat Transfer. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Q51.
The oil pan of 1.6 engine approximates a flat plate 0.3 m wide by 0.45 m long and protrudes below the framework of the automobile. The engine oil is at 95 degree Celsius and the ambient air temperature is 35 degree Celsius. If the automobile runs at 36 km/hr, make calculations for the rate of heat transfer from the oil-pan surface. Assume negligible resistance to conduction through the oil pan

a.

190.37 W

b.

180.37 W

c.

170.37 W

d.

160.37 W

Discuss
Answer: (c).170.37 W
Q52.
Air flows through a 10 cm internal diameter tube at the rate of 75 kg/hr. Measurements indicate that at a particular point in the tube, the pressure and temperature of air are 1.5 bar and 325 K whilst the tube wall temperature is 375 K. Find heat transfer rate from one meter length in the region of this point
The general non-dimensional correlation for turbulent flow in the tube is

Nu = 0.023 (Re)^0.8 (Pr)^0.4

Where the fluid properties are evaluated at the bulk temperature

a.

147.35 W

b.

157.35 W

c.

167.35 W

d.

177.35 W

Discuss
Answer: (d).177.35 W
Q53.
The ratio of inertia force to viscous force is known as

a.

Grashof number

b.

Reynolds number

c.

Fourier number

d.

Nusselt number

Discuss
Answer: (b).Reynolds number
Q54.
Velocity within the given fields would be similar in magnitude, direction and turbulence pattern when

a.

Nusselt number are different

b.

Nusselt number are same

c.

Reynolds number are different

d.

Reynolds number are same

Discuss
Answer: (d).Reynolds number are same
Q55.
Reynolds number is given by the quantity
(Where,
p is density
ฮด is viscosity
V is volume
l is length)

a.

p V l/ฮด

b.

2 p V l/ฮด

c.

3 p V l/ฮด

d.

4 p V l/ฮด

Discuss
Answer: (a).p V l/ฮด
Q56.
Air enters a rectangular duct measuring 30 cm by 40 cm with a velocity of 8.5 m/s and a temperature of 40 degree Celsius. The flowing air has a thermal conductivity 0.028 W/m K, kinematic viscosity 16.95 * 10¯โถ m²/s and from empirical correlations the Nusselt number has been approximated to be 425. Find out the flow Reynolds number

a.

1.1719 * 10โถ

b.

2.1719 * 10โถ

c.

0.1719 * 10โถ

d.

4.1719 * 10โถ

Discuss
Answer: (c).0.1719 * 10โถ
Q57.
For laminar flow, Reynolds number should be

a.

Less than 2300

b.

Equal to 2300

c.

Greater than 2300

d.

Less than 4300

Discuss
Answer: (a).Less than 2300
Q58.
For turbulent flow, Reynolds number must be

a.

Less than 5000

b.

Equal to 6000

c.

Less than 6000

d.

Greater than 6000

Discuss
Answer: (d).Greater than 6000
Q59.
What is the value of convective coefficient of air and superheated steam in case of forced convection?

a.

30-900 W/m² K

b.

30-700 W/m² K

c.

30-300 W/m² K

d.

30-400 W/m² K

Discuss
Answer: (c).30-300 W/m² K
Q60.
Heat is being transferred by convection from water at 48 degree Celsius to glass plate whose surface is exposed to water at 40 degree Celsius. The thermal conductivity of water is 0.6 W/m K and the thermal conductivity of glass is 1.2 W/m K. The spectral gradient of temperature in the water at the water glass interface is 10¯โด K/m. The heat transfer coefficient in W/m² K is

a.

0.0

b.

750

c.

6.0

d.

4.8

Discuss
Answer: (b).750
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