Which type of heat exchanger an automobile radiator is?
A.Parallel flow type
B.Counter flow type
C.Recuperator type
D.Regenerator type
E.Cross flow type
Category: Heat Transfer Mcqs
Four rods with different radii ‘r’ and length ‘l’ are used to connect to reservoirs of heat at different temperature. Which one of them with conduct most heat?
A.r = 2 cm, l = 2m
B.r = 1 cm, l = 1m
C.r = 2 cm, l =
D.r =
The wagelength of X-rays is
A.6 to 100000 micron
B.0.4 to 0.8 micron
C.0.1 to 0.4 micron
D.0.014 to 0.018 micron
E.0.8 to 400 micron
If a body reflects entire radiation incident on it, then it is known as
A.Black body
B.Grey body
C.White body
D.Transparent body
E.Opaque body
If thermal conductivity of a material of wall varies as ko (1 – ?t ). The temperature at the centre of the wall will be
A.Same as in case of constant thermal conductivity
B.More than that in case of constant thermal conductivity
C.Less than that in case of constant thermal conductivity
D.Depends on other factors
E.None of the above
In sugar mills cane juice is evaporated in
A.Horizontal tube evaporators
B.Long vertical tube evaporators
C.Short vertical tube evaporators
D.Zig-zag tube evaporator
E.Flash evaporator
A piece of metal with a circular hole is heated. If the metal expands on heating the diameter of the hole will
A.Increase
B.Decrease
C.Increase or decrease depending upon the diameter of the whole
D.Increase or decrease depending on the kind of the metal
A dimensionless heat transfer coefficient which gives a measure of the ratio of the heat transfer rate to the rate at which heat would be conducted within the fluid under a temperature gradient is known as
A.Reynolds number
B.Grashoff number
C.Nusselt number
D.Peclet number
E.Stanton number
