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Heat Transfer Quiz 1

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Question 1

In unsteady-state conduction for bodies with negligible temperature gradients, the time temperature variation curve is ___________.

Question 2

In a mass transfer process of diffusion of hot smoke in cold air in a power, the temperature profile and the concentration profile will become identical when:

Question 3

Which non-dimensional number relates number relates the thermal boundary layer and hydrodynamic boundary layer?

Question 4

Which of the following expression gives the thermal resistance for heat conduction through a hollow sphere of radii r1 and r2?

Question 5

The value thermal conductivity of thermal insulation applied to a hollow spherical vessel containing very hot material is 0.5 W/mK. The convective heat transfer coefficient at the outer surface of insulation is 10 W/m2K. What is the critical radius of the sphere?

Question 6

A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK.If a temperature difference of 600 C is imposed across it, what is the heat flow?

Question 7

During the process of boiling and condensation, only a phase change take place and one fluid remains at constant temperature throughout the heat exchanger. In terms of number of transfer units (NTU), the effectiveness of such an heat exchanger would be

Question 8

What is the value of the shape factor for two infinite parallel surface separated by a distance d?

Question 9

Match List-I (Phenomenon) with List-II (Number/Law/Factor) and select the correct answer using the code given below the lists:
Lists-I
A) Radiation heat transfer
B) Conduction heat transfer
C) Forced convection
D) Transient heat flow
Lists-II
1) Biot number
2) view factor
3) Fourier’s law
D) Stanton number

Question 10

After expansion from a gas tube turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow compact heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger?
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