31
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
A)
The corrosive and fouling fluid should be preferably routed through the tubes
B)
The viscous fluid should be routed through the shell side
C)
Lower flow rate fluid should be routed through the shell side
D)
Higher pressure fluid stream should be routed through the shell side
Answer & Solution
Answer: Option
D
32
Pick out the wrong statement pertaining to a shell and tube heat exchanger.
A)
The minimum value of baffle spacing is 50 mm
B)
The maximum value of baffle spacing is equal to the I.D. of the shell
C)
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
D)
Disk and doughnut baffle is the most commonly used baffle
Answer & Solution
Answer: Option
D
33
Pick out the wrong statement pertaining to shell and tube heat exchanger.
A)
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle
B)
Baffles are supported independently of the tubes by tie rods and positioned by spacers
C)
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter
D)
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
Answer & Solution
Answer: Option
D
34
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
A)
1000
B)
3000
C)
5000
D)
10000
Answer & Solution
Answer: Option
D
35
In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for
A)
Reducing scale deposition
B)
Increasing pressure drop
C)
Fixing the tubes
D)
Creating turbulence
Answer & Solution
Answer: Option
D
36
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
A)
Di, opt = 3 Q0.36 .ρ0.18
B)
Di, opt = 3.9 Q0.45 .ρ0.23
C)
Di, opt = 7.6 Q0.36 .ρ0.9
D)
Di, opt = 3 Q0.36 .ρ1.86 .μ0.08
Answer & Solution
Answer: Option
A
37
Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around
A)
2.5"
B)
0.5"
C)
5"
D)
50% of the plate spacing
Answer & Solution
Answer: Option
B
38
Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
A)
10
B)
20
C)
30
D)
5
Answer & Solution
Answer: Option
C
39
Liquid/petroleum fuel storage tanks are built underground (as in case of petrol pumps), when the storage capacity is less than __________ kilolitres.
A)
20
B)
30
C)
45
D)
85
Answer & Solution
Answer: Option
C
40
Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of
A)
Preventing the local overstressing of the shell around the opening
B)
Reduction of discontinuity in shape at the junction
C)
Making the joint leak proof
D)
None of these
Answer & Solution
Answer: Option
A
