Test: Laminar Film Condensation - Mechanical Engineering MCQ

p g (δ y – y/2)/σ

p g (δ y – y ²)/σ

p g (δ y – y ²/2)/σ

p g (δ – y ²/2)/σ

[4 k δ (t _sat – t _s) x/p ² g h _{f g}] ^0.25

[4 k δ (t _sat – t _s) x/p ² g h _{f g}] ^0.5

[4 k δ (t _sat – t _s) x/p ² g h _{f g}] 

[4 k δ (t _sat – t _s) x/p ² g h _{f g}] ^1.5

p g δ ³/ 3

p g δ ³/ 3 σ

p g δ ²/ 3 σ

p g δ ²/ 3

4 g sin α

3 g sin α

2 g sin α

g sin α

[k ³ p ² g h _{f g} /4 δ l (t _sat – t _s)] ^0.25

[k ³ p ² g h _{f g} /4 δ l (t _sat – t _s)] ^0.5

[k ³ p ² g h _{f g} /4 δ l (t _sat – t _s)] ^0.1

[k ³ p ² g h _{f g} /4 δ l (t _sat – t _s)] ^0.125

The rate of condensation heat transfer is maximum at the upper edge of the plate and progressively decreases as the lower edge is approached

The average heat transfer coefficient is two third of the local heat transfer coefficient at the lower edge of the plate

At a definite point on the heat transfer, the film coefficient is directly proportional to thermal conductivity and inversely proportional to thickness of film at the point

The film thickness increases as the fourth root of the distance down the upper edge

The condenser should be installed with shorter side horizontal

The condenser should be installed with longer side horizontal

The condenser should be installed with longer side vertical

The condenser should be installed with shorter side vertical

61.5 cm

71.5 cm

81.5 cm

91.5 cm

2000

1900

1800

1700

– ¼ power of acceleration due to gravity

½ power of density of liquid

¼ power of enthalpy of evaporation

– ½ power of dynamic viscosity