E-PolyLearning

11. The famous Fourier series is named after
a. Diller and Ryan
b. J.B. Joseph Fourier
c. Stefan- Boltzmann
d. Wein’s
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Answer: (b).J.B. Joseph Fourier

12. Fourier law of heat conduction is best represented by
a. Q = -k A d t /d x
b. Q = k A d x/d t
c. Q = -k A
d. Q = k d t/d x
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Answer: (a).Q = -k A d t /d x

13. Here are some assumptions that are made for Fourier law. Identify the wrong one
a. No internal heat generation
b. Steady state heat conduction
c. Non- linear temperature profile
d. Isotropic and homogenous material
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Answer: (c).Non- linear temperature profile

14. Consider the following statements:

The Fourier heat conduction equation

Q = -k A d t /d x

Presumes

i) Steady state conditions

ii) Constant value of thermal conductivity

iii) Uniform temperature at the wall surface

iv) One dimensional heat flow

Which of these statements are correct?
a. 1, 2 and 3
b. 1, 2 and 4
c. 2, 3 and 4
d. 1, 3 and 4
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Answer: (d).1, 3 and 4

15. Negative sign in Fourier heat conduction equation indicates
a. Heat always flow is in the direction of positive temperature gradient
b. Heat always flow in the direction of negative temperature gradient
c. No heat flow is there
d. Data is insufficient
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Answer: (b).Heat always flow in the direction of negative temperature gradient

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