In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

A Relative roughness
B Absolute roughness
C Friction co-efficient for flows at equal Reynold number
D All of the above

Correct Answer: Friction co-efficient for flows at equal Reynold number

Bissoy MCQ
#Chemical Engineering #Fluid Mechanics

Related Questions

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
A Brings about no further reduction of
B Increases
C Decreases
D None of these
A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is:
A 6 hours
B 10 hours
C 15 hours
D 30 hours
The friction factor for turbulent flow in a hydraulically smooth pipe
A Depends only on Reynolds number
B Does not depend on Reynolds number
C Depends on the roughness
D None of these
In turbulent flow, a rough pipe has the same friction factor as a smooth pipe
A In the zone of complete turbulence
B When the roughness projections are much smaller than the thickness of the laminar film
C Everywhere in the transition zone
D When the friction factor is independent of the Reynold's number
A pipe is defined as 'hydraulically smooth', if the friction factor
A Is not a function of Reynolds number
B For a given Reynolds number remains constant even on further smoothening of the pipe
C Is zero irrespective of the Reynolds number
D None of these
A water tank with 64-gallon capacity is filled by pipe A and emptied by pipe B. If the rate of water flow through pipe A is 2 gallons per hour, how many gallons per hour should flow through pipe B so that when both pipes are open, the initially empty tank shold be full in exactly 96 hours?
A 3/8
B 4/3
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For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
A Re0.33
B Re0.53
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A tank is fitted with 8 pipes, some of them that fill the tank and others that are waste pipe meant to those that empty the tank can empty it in 6 hours. If all the pipes are kept open when the tank is full, it will take exactly 6 hours for the tank to empty. How many of these are these are fill pipes?
A 2
B 4
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Pipe A alone can fill a tankin 8 hours .Pipe B can fill it in 6 hours . If both the pipes are operated and after 2 hours pipe A is closed, then the other pipe will fill the tank in.
A 6 hours
B 3 1/2 hours
C 4 hours
D 1 1/2 hours
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.
A 0.5
B 5
C 50
D 100

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