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.

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Convective Heat Transfer MCQs | Page 4 of 7

Q31.
For turbulent flow over a flat plate, the average value of Nusselt number is prescribed by the relation

Nu = 0.664 (Re)^0.5 (Pr)^0.33

Which of the following is then a false statement?

The average heat transfer coefficient increases as
Discuss
Answer: (a).1/5 power of plate length
Q32.
A nuclear reactor with its core constructed of parallel vertical plates 2.25 m high and 1.5 m wide has been designed on free convection heating of liquid bismuth. Metallurgical considerations limit the maximum surface temperature of the plate to 975 degree Celsius and the lowest allowable temperature of bismuth is 325 degree Celsius. Estimate the maximum possible heat dissipation from both sides of each plate. The appropriate correlation for the convection coefficient is
Nu = 0.13 (Gr Pr)^1/3
Discuss
Answer: (b).153 MW
Q33.
A thin walled duct of 0.5 m diameter has been laid in an atmosphere of quiescent air at 15 degree Celsius and conveys a particular gas at 205 degree Celsius. Base your calculations on one meter length of the duct, estimate the convective coefficient of heat transfer
Discuss
Answer: (a).5.086 W/m² K
Q34.
Free correction modulus is given by
Discuss
Answer: (c).p² β g c P/µ k
Q35.
The free convection coefficient is given by

h = C₁ d t m/l^(1 – 3m)

The value of exponent for laminar flow is
Discuss
Answer: (a).0.5
Q36.
For inclined plates we multiply Grashoff number with
Discuss
Answer: (d).Cos α
Q37.
The free convection coefficient is given by

h = C₁ d t m/l^(1 – 3m)

The value of exponent for turbulent flow is
Discuss
Answer: (b).0.33
Q38.
Which of the following is true for laminar flow?
Discuss
Answer: (c).10^4 < Gr Pr < 10^9
Q39.
A horizontal heated plate at 200 degree Celsius and facing upwards has been placed in still air at 20 degree Celsius. If the plate measures 1.25 m by 1 m, make calculations for the heat loss by natural convection. The convective film coefficient for free convection is given by the following empirical relation

h = 0.32 (α)^0.25 W/m² K

Where α is the mean film temperature in degrees kelvin
Discuss
Answer: (a).6006 W
Q40.
For laminar flow, Reynolds number must not be less than
Discuss
Answer: (d).40000
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