Related Questions

The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid
A Varies directly as the area and the LMTD
B Directly proportional to LMTD and inversely proportional to the area
C Varies as square of the area
D None of these
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
A Increases
B Decreases
C Remains constant
D Passes through a maxima
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?
A Rotational
B Unsteady
C Turbulent
D Non-uniform
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
A Conduction
B Free convection
C Forced convection
D Radiation
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
A Conduction
B Free convection
C Forced convection
D Radiation
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the
A Existence of thermal boundary layer
B Temperature gradient produced due to density difference
C Buoyancy of the bubbles produced at active nucleation site
D None of these
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.
A No
B The least
C The largest
D Lower

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