**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 45^{o} 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