The unit of thermal conductivity in M.K.S. unit is
A.kcal/m/?C
B.kcal/m/sec?C
C.kcal/m2/?C sec
D.None of the above
Category: Heat Transfer Mcqs
The factor which affects nucleate pool boiling is
A.Material of heating surface
B.Surface condition of heating surface
C.Physical properties of liquid
D.Pressure
E.All of the above
A slab of ice has one-half covered with black cloth and the other half with white cloth. The slab is now placed in sunlight. It will be observed that
A.more ice will melt under black cloth
B.more ice will melt under white cloth
C.equal amount of ice will melt under the two cloths
D.ice will not melt
If two systems are being compared on the basis of temperature and heat flux, the similarity being considered is
A.dynamic similarity
B.kinematic similarity
C.thermal similarity
D.geometrical similarity
Maximum heat transfer rate can be expected in case of
A.Turbulent flow
B.Laminar flow
C.Co-current flow
D.Counter current flow
E.Heat transfer rate is independent of nature of flow
The value of reheat factor is of the order of
A.Less than 1
B.1.02 to 1.06
C.1.2 to 1.6
D.More than 2
Agitated film evaporator is suitable for concentrating
A.Low temperature liquids
B.Liquid metal
C.Viscous liquids
D.Corrosive liquids
E.Insulating liquids
The triple point temperature for water is
A.0?K
B.0?C
C.0.1?C
D.0.01?C
E.0.001?C
The relation between the emissive and absorptive power of a surface is developed under
A.Planck’s law
B.Kirchhoff’s law
C.Electrical analogy
D.Stefan-Baltzmann’s law
E.Law of radiations
In case of liquids and gases, the heat transfer takes place according to
A.radiation
B.conduction
C.convection
D.Both (A) and (C)
