A device for transferring heat from one fluid to another is known as
A.Condenser
B.Radiation
C.Heat exchanger
D.Evaporator
Category: Heat Transfer Mcqs
Which of the following method is used for finding the thermal conductivity of rubber?
A.Lec’s disc method
B.Searles method
C.Cylindrical shell method
D.Laby and Hercus method
E.Any of the above
The rate of heat flow between a solid wall and a fluid (in contact with a solid wall) is given by
A.Wein’s Law
B.Kirchhoff’s law
C.Newton-Rikhman’s Law
D.None of the above
Which of the following are generally diathermanous?
A.Solids
B.Liquids
C.Gases
D.All of the above
In which of the following will the evaporation rate be large?
A.Salt pan near the sea
B.Narrow river surrounded by trees
C.Covered swimming pool
D.Near the mountain
E.Leaking water from pipe.
In case of white body, absorptivity is
A.Zero
B.Between 0 to 0.5
C.More than 0.5
D.1
The surface which diffusely reflects and emits the same amount of energy which it receives by radiation is known as
A.A perfect black surface
B.A perfect grey surface
C.A perfect white surface
D.A perfect radiating surface
E.None of the above
A sphere 15 cm in diameter is covered with 5 cm of insulation (k = 0.057 kcal/m-hr-?C). The inside and outside surface temperature of the insulation are 315?C and 80?C respectively. The heat loss per sq. m of the outside surface will be closer to
A.40 kcal/hr
B.80 kcal/hr
C.160 kcal/hr
D.320 kcal/hr
Dynamic similarity is the similarity of
A.Shape
B.Forces
C.Velocities
D.Effective dimensions
E.None of the above
