Related Questions

Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is
A [

A. Thin walled having the value of Ao Ai/

B. Thick walled

B Having the value of Ao/Ai > 2
C Both B and C
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
Which area is used in case of heat flow by conduction through a cylinder?
A Logarithmic mean area
B Arithmetic mean area
C Geometric mean area
D None of these
The height of a cylinder is four times the radius of the cylinder. If the volume of the cylinder is 256 cm², what is the radius of the cylinder.
A 4 cm
B 8 cm
C 16 cm
D 24 cm
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.
A Equal to
B Less than
C More than
D None of these
The area of the base of a cylinder is 100πm2. The volume of the cylinder is 900πm3. What is the height of the cylinder?
A 9m
B 10m
C 11m
D 12m
The area of the base of a cylinder is 100πm2. The volume of the cylinder is 900πm2. What is the height of the cylinder?
A 9m
B 10m
C 11m
D 12m
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
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
The surface area of hollow cylinder with radius 'r and height 'h' is measured by-
A 2πr-h
B 2πr+h
C πrh
D 2πrh

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