Test: Fourier Equation

# Test: Fourier Equation

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## 10 Questions MCQ Test Heat Transfer | Test: Fourier Equation

Test: Fourier Equation for Chemical Engineering 2023 is part of Heat Transfer preparation. The Test: Fourier Equation questions and answers have been prepared according to the Chemical Engineering exam syllabus.The Test: Fourier Equation MCQs are made for Chemical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fourier Equation below.
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Test: Fourier Equation - Question 1

### The famous Fourier series is named after

Detailed Solution for Test: Fourier Equation - Question 1

He gave this theory in 1824.

Test: Fourier Equation - Question 2

### Fourier law of heat conduction is best represented by

Detailed Solution for Test: Fourier Equation - Question 2

According to Fourier law of heat conduction, Q = -k A d t /d x.

Test: Fourier Equation - Question 3

### Here are some assumptions that are made for Fourier law. Identify the wrong one

Detailed Solution for Test: Fourier Equation - Question 3

It has constant temperature gradient and a linear temperature profile.

Test: Fourier Equation - Question 4

Consider the following statements:

The Fourier heat conduction equation
Q = -k A d t /d x
Presumes
ii) Constant value of thermal conductivity
iii) Uniform temperature at the wall surface
iv) One dimensional heat flow

Which of these statements are correct?

Detailed Solution for Test: Fourier Equation - Question 4

Thermal conductivity is different for different materials.

Test: Fourier Equation - Question 5

The surface temperature of body 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

Detailed Solution for Test: Fourier Equation - Question 5

Heat conducted through the plate = convection heat losses + radiation heat losses. So, d t /d x = – 13155/12.5 = – 1052.4 degree Celsius.

Test: Fourier Equation - Question 6

Detailed Solution for Test: Fourier Equation - Question 6

The ratio d t/d x represents the change in temperature per unit thickness i.e. the temperature gradient. So it represents heat flow in the direction of negative temperature gradient.

Test: Fourier Equation - Question 7

Transmission of heat i.e. molecular is smallest in case of

Detailed Solution for Test: Fourier Equation - Question 7

In gases atoms are arranged loosely, there is less molecular transmission of heat as compared to solids, liquids and alloys.

Test: Fourier Equation - Question 8

Which one is not the unit of thermal conductivity?

Detailed Solution for Test: Fourier Equation - Question 8

The unit kcal/m hr K could also be specified as J/m s K or W/m s K and this is actually done while quoting the numerical values of thermal conductivity.

Test: Fourier Equation - Question 9

“Thermal conductivity represents the amount of heat conducted across unit area when a temperature difference of one kelvin”. True or false

Detailed Solution for Test: Fourier Equation - Question 9

It is across unit area and through unit distance.

Test: Fourier Equation - Question 10

Which of the following is the unit of thermal resistance?

Detailed Solution for Test: Fourier Equation - Question 10

Thermal resistance is expressed in the unit’s hr degree/kcal, degree/W and s degree/J.

## Heat Transfer

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## Heat Transfer

58 videos|70 docs|85 tests