Related Questions

Electro-magnetic spectrum range, which is important for radiation varies from __________ microns.
A 1 to 100
B 0.5 to 50
C 10 to 100
D 100 to 1000
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:
A 10-10 to 106 m
B 10-8 to 106 m
C 10-10 to 1010 m
D 10-8 to 108 m
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
Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.
A 2 to 3
B 0.01 to 0.10
C 200 to 300
D 100 to 1000
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
A [

A.

B. 10 to 25

B > 1000
With increase in the distance between the heat source and the object receiving the heat, the radiation heat transfer
A Decreases
B Increases
C Increases exponentially
D Remains unaffected
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
Alphatron measures pressure __________ microns.
A [

A.

B.

B > 3
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

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