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Test: Heat Transfer By Natural Convection - 1 - Mechanical Engineering MCQ


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10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering - Test: Heat Transfer By Natural Convection - 1

Test: Heat Transfer By Natural Convection - 1 for Mechanical Engineering 2024 is part of Topicwise Question Bank for Mechanical Engineering preparation. The Test: Heat Transfer By Natural Convection - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Heat Transfer By Natural Convection - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Heat Transfer By Natural Convection - 1 below.
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Test: Heat Transfer By Natural Convection - 1 - Question 1

Which of the following heat flow situations pertains to free or natural convection?

Test: Heat Transfer By Natural Convection - 1 - Question 2

The dimensionless parameter is referred to as

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Test: Heat Transfer By Natural Convection - 1 - Question 3

Choose the wrong statement with respect to Nusselt number and convective heat transfer coefficient

Test: Heat Transfer By Natural Convection - 1 - Question 4

Which one of the following number represents the ratio of kinematic viscosity to thermal diffusivity?

Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 4

Prandtl number is the ratio of two transport properties i.e the ratio of momentum diffusivity and thermal diffusivity. Prandtl number controls the relation between the velocity and temperature distributions.

Test: Heat Transfer By Natural Convection - 1 - Question 5

Consider the following boundary layer for natural convection on a vertical plate and match accordingly:


Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 5

AA : Turbulent region on hot wall
BB : Laminar region on hot wall
CC: Laminar region on cold wall
DD: Turbulent region on cold wall
EE : Velocity profile for hot wall
FF : Velocity profile for cold wall
GG: Boundary layer for cold wall
HH : Boundary layer for hot wall..

Test: Heat Transfer By Natural Convection - 1 - Question 6

Which of the following parameter is a measure of the relative importance of natural convection in relation to forced convection? 
All empirical parameters have their usual meaning.

Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 6

If (Gr/Re2) << 1, flow is primarily by forced convection
If (Gr/Re2) >> 1, flow is dominant by natural convection
If (Gr/Re2) ≌ 1, natural and forced convection are of same magnitude.

Test: Heat Transfer By Natural Convection - 1 - Question 7

This value governs the transition from laminar to turbulent flow in natural convection:

Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 7

In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the Prandtl number, Grashoff's number

Test: Heat Transfer By Natural Convection - 1 - Question 8

The empirical correlation for natural convection is represented by
All empirical parameters have their usual meaning.

Test: Heat Transfer By Natural Convection - 1 - Question 9

The Prandtl number will be lowest for

Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 9

Test: Heat Transfer By Natural Convection - 1 - Question 10

In respect of free convection over a vertical flat plate, the Nusselt number for laminar and turbulent flow varies respectively as

Detailed Solution for Test: Heat Transfer By Natural Convection - 1 - Question 10

for vertical plate,
Nu = 0.59 Ra1/4 for 104 < Ra < 109
Nu = 0.13 Ra1/3 for 1010 < Ra < 1013

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