Related Questions

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because
A Heat transfer co-efficient are high
B There is no risk of contamination
C There is no mist formation
D Cost of equipment is lower
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 most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.
A Less than
B 1.25-1.50 times
C 2.5 times
D One-fourth of
Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
A 1.25
B 1.75
C 2.5
D 3.5
Water is normally used as a coolant in the heat exchange equipments mainly because ofits
A Abundance & high heat capacity
B Low density
C Low viscosity
D High fluidity
Multipass heat exchangers are used
A Because of simplicity of fabrication
B For low heat load
C To obtain higher heat transfer co-efficient and shorter tube
D To reduce the pressure drop
Double pipe heat exchangers are used
A When heat transfer area required is very high
B When heat transfer area required is very low, i.e (100 - 200 ft2)
C Because it occupies less floor area
D Because it is less costly
In shell and tube heat exchangers, straight tie rods are used to
A Hold baffle in space
B Fix the tubes in position
C Account for thermal strain
D None of these
Floating head heat exchangers are used for the
A Heat transfer between corrosive fluids
B Cases where temperature difference between the shell and the tubes is more (>50°C)
C Co-current heat transfer systems
D Counter-current heat transfer systems
Steam is preferred to be used as a heating medium in heat exchangers, because of its
A Low cost
B High latent heat
C Non-corrosive condensate
D High film co-efficient

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