Heat and Mass Transfer MCQ – Objective Questions & Answers

1. The conduction heat diffuses in a material when the material has:
1) High thermal conductivity
2) Low density
3) High specific heat
4) High viscosity
Which of the above statements are correct?
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 4 and 1
Ans: A

2. A dimensionless quantity that connects the link between velocity flow field and the temperature field is
A) Nusselt number
B) Prandtl number
C) Reynolds number
D) Grashof number
Ans: B

3. The characteristic length for computing Grashof number in the case of horizontal cylinder is
A) The length of the cylinder
B) The diameter of the cylinder
C) The perimeter of the cylinder
D) The radius of the cylinder
Ans: B

4. For which of these configuration is a minimal temperature difference required for natural convection to set in
A) Fluid near a heated vertical plate
B) Fluid near a heated plate inclined at 45o to the vertical
C) Fluid over the a heated horizontal plate
D) Fluid near a heated cylinder
Ans: C

5. For a hemispherical furnace with flat circular base of diameter D, the view factor from the dome to its base is
A) 0.5
B) 1
C) 0
D) 0.32
Ans: A

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