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Heat Transfer Operations
Advanced Heat Transfer Operations
Quiz 1
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Q.1
Falling film evaporators are a subclass of long tube evaporators.
a) True
b) False
Q.2
Falling film evaporators can be operated in _______________
a) Counter-flow with the vapour
b) Co-current flow with vapour
c) Both co-current and counter-current
d) Separate segments in any direction
Q.3
Falling film evaporators are considered over climbing film evaporators because of which one of the following factor?
a) Efficiency
b) Product holdup
c) Driving force requirement
d) Temperature sensitivity
Q.4
The applications of falling film and rising film are more or less same, but if industries have the cost capital, they go for falling film, why?
a) It has high temperature gradient and natural convection
b) Better efficiency of falling film
c) It has less temperature gradient and natural convection
d) No need for upward pressure
Q.5
Falling film evaporators are best suited for pharmaceutical industries because
a) It has high temperature gradient and natural convection
b) Low pressure
c) It has less temperature gradient and natural convection
d) High headroom available
Q.6
Falling film evaporators can be used with the fluid falling over
a) (i)(ii)(iii)
b) (i)(ii)
c) (i)(iii)(iv)
d) (i)(ii)(iii)(iv)
Q.7
Falling film evaporators have __________ product holdup.
a) Large
b) Very high
c) Low
d) Zero
Q.8
Which one of the following is not an advantage of falling film evaporator?
a) Relatively low cost
b) High headroom
c) Large surface area for heating available
d) Low product holdup
Q.9
Which one of the following cannot be regarded as a demerit of falling film evaporator?
a) High headroom requirement
b) Corrosive fluids cannot be used
c) Large product holdup
d) Recirculation needed
Q.10
The fluids in falling tube evaporator usually form a film inside the tubes but there are applications when the fluid forms a film outside the tube and falls subsequently.
a) True
b) False
Q.11
In order to maintain conservation of mass as this fluid fall proceeds in a falling film evaporator, the downward vapour velocity ___________
a) Decreases
b) Increases
c) Remains Same
d) Oscillates
Q.12
Recognize the falling film evaporator.
a)
b)
c)
d)
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