MCQs of Two-Phase Heat Transfer (Heat Transfer-3151909)

MCQ No - 1

Dropwise condensation usually occurs on

(A)

glazed surface

(B)

smooth surface

(C)

oily surface

(D)

coated surface

C

MCQ No - 2

With an increase in excess temperature, the heat flux in boiling

(A)

increases continuously

(B)

decreases and then increases

(C)

decreases, and then increases and again decreases

(D)

increases then decrease and again increases

D

MCQ No - 3

The excess temperature range 50 $°$ C $<$ $∆ T < 200 ° C$ is indicative of the region of

(A)

interface evaporation

(B)

nuclear boiling

(C)

partial film boiling

(D)

stable film boiling

C

MCQ No - 4

Leiden frost effect is associated with

(A)

evaporation of a solution

(B)

boiling of liquid on a hot surface

(C)

exchange of heat between two fluids

(D)

condensation of vapour on a cold surface

B

MCQ No - 5

Heat flux increases with temperature excess beyond the Leiden frost point due to

(A)

the occurrence of subcooled boiling

(B)

promotion of nucleate boiling

(C)

radiation effect becomes predominant

(D)

vapour space becomes large

C

Heat Transfer (3151909) MCQ