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Process Equipment and Plant Design

Process Equipment and Plant Design
Friction factor for turbulent flow in a new pipe is given by

f = 25/NRe
f = 0.22 NRe0.05
f = 0.04/NRe0.16
f = 16/NRe

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Process Equipment and Plant Design
Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the

Working stress to ultimate stress
Ultimate stress to working stress
None of these
Ultimate stress to breaking stress

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Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More
Less
Same
More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

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Process Equipment and Plant Design
The ratio of shear stress to shear strain is called

Modulus of rigidity
Shear modulus
Bulk modulus
Modulus of elasticity

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Process Equipment and Plant Design
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of

2
20.8
None of these
20.2

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Process Equipment and Plant Design
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around

3 and 5
100 and 250
25 and 60
250 and 600

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