Test: Free Convection Boiling - Mechanical Engineering MCQ

Nu = f ₁ (G r) f ₂ (P r)

Nu = 2 f ₁ (G r) f ₂ (P r)

Nu = 3 f ₁ (G r) f ₂ (P r)

Nu = 4 f ₁ (G r) f ₂ (P r)

h = 1.973 (Q/A) ^0.45

h = 1.973 (Q/A) ^0.55

h = 1.973 (Q/A) ^0.65

h = 1.973 (Q/A) ^0.75

1.308 * 10 ⁸ W/m²

1.308 * 10 ⁷ W/m²

1.308 * 10 ⁶ W/m²

1.308 * 10 ⁵ W/m²

18.01 degree Celsius

19.01 degree Celsius

20.01 degree Celsius

21.01 degree Celsius

4

1 and 2

1

3 and 4

h _{f g}

(h _{f g}) ^0.5

1/(h _{f g}) ²

(h _{f g}) ³

Liquid properties, material and condition of the surface

Material of the surface only

Material and roughness of the surface

Liquid properties and material of the surface

The steam boilers employing natural convection have steam raised through pool boiling

Boiling occurs when a heated surface is exposed to a liquid and maintained at a temperature lower than the saturation temperature of the liquid

Leiden-frost effect refers to the phenomenon of stable film boiling

The nucleation boiling is characterized by the formation of bubbles at the nucleation sites and the resulting liquid agitation

1.53 * 10 ⁸ W/m²

1.53 * 10 ⁷ W/m²

1.53 * 10 ⁶ W/m²

1.53 * 10 ⁵ W/m²

6.15 V

7.15 V

8.15 V

9.15 V