Fourier Equation And Thermal Conductivity MCQs

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

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Fourier Equation And Thermal Conductivity MCQs | Page 1 of 4

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Q1.
The diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m² degree and radiation factor is 0.9

a.

– 1052.4 degree celsius

b.

– 2052.4 degree celsius

c.

– 3052.4 degree celsius

d.

– 4052.4 degree celsius

Discuss
Answer: (a).– 1052.4 degree celsius
Q2.
From the concept of kinetic theory, mean travel velocity of the gas molecules is prescribed by the relation
(Where,
G = Universal gas constant
M = Molecular weight of the gas
T = Absolute temperature)

a.

V = (3M/GT)⅟₂

b.

V = (3GT/M)⅟₂

c.

V = (6T/GM)⅟₂

d.

V = (3GT/2M)⅟₂

Discuss
Answer: (b).V = (3GT/M)⅟₂
Q3.
Low temperature insulation are used when the enclosure is at a temperature lower than the ambient temperature. Which one of the following is not a low temperature insulation?

a.

Asbestos

b.

Cork

c.

Cattle hair

d.

Slag wool

Discuss
Answer: (a).Asbestos
Q4.
The value of Lorenz number in 10¯⁸ W ohms/K² is

a.

2.02

b.

2.35

c.

2.56

d.

2.45

Discuss
Answer: (d).2.45
Q5.
Consider the following parameters
(i) Composition
(ii) Density
(iii) Porosity
(iv) Structure
Then, thermal conductivity of glass wool varies from sample to sample because of variation is

a.

1 and 2

b.

1, 2, 3 and 4

c.

1 and 3

d.

1, 2 and 3

Discuss
Answer: (b).1, 2, 3 and 4
Q6.
The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as

a.

k/σ T

b.

k/σ

c.

k σ/T

d.

k/T

Discuss
Answer: (a).k/σ T
Q7.
The relation Ϫ² t =0 is referred to as

a.

Poisson’s equation

b.

Fourier heat conduction equation

c.

Solution for transient conduction

d.

Laplace equation

Discuss
Answer: (d).Laplace equation
Q8.
The unit of thermal diffusivity is

a.

m²/hr-K

b.

kcal/m²-hr

c.

m²/hr

d.

m/hr-K

Discuss
Answer: (c).m²/hr
Q9.
To effect a bond between two metal plates, 2.5 cm and 15 cm thick, heat is uniformly applied through the thinner plate by a radiant heat source. The bonding must be held at 320 K for a short time. When the heat source is adjusted to have a steady value of 43.5 k W/m², a thermocouple installed on the side of the thinner plate next to source indicates a temperature of 345 K. Calculate the temperature gradient for heat conduction through thinner plate. In the diagram, the upper plate is 2.5 cm thick while the lower is 15 cm thick.

a.

– 1000 degree Celsius/m

b.

– 2000 degree Celsius/m

c.

– 3000 degree Celsius/m

d.

– 4000 degree Celsius/m

Discuss
Answer: (a).– 1000 degree Celsius/m
Q10.
The diffusion equations
Ɏ²t + q g = (1/α) (d t/d r)
Governs the temperature distribution under unsteady heat flow through a homogenous and isotropic material. The Fourier equation follows from this expression when

a.

Temperature doesn’t depends on time

b.

There is no internal heat generation

c.

Steady state conditions prevail

d.

There is no internal heat generation but unsteady state condition prevails

Discuss
Answer: (d).There is no internal heat generation but unsteady state condition prevails
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