Chemical Engineering - Fluid Mechanics

16. 

In case of venturimeters, friction losses are about __________ percent of maximum velocity head.

A. 2
B. 8
C. 12
D. 20

Answer: Option A

Explanation:

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17. 

With increase in the schedule number of a pipe of a particular nominal size, the

A. wall thickness also increases.
B. I.D. of the pipe decreases.
C. O.D. of the pipe remains constant.
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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18. 

Turbine impeller

A. produces only radial current.
B. produces only tangential current.
C. is effective over wide range of viscosities.
D. does not produce tangential current.

Answer: Option C

Explanation:

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19. 

Friction produced by the formation of wakes is called the __________ friction.

A. disk
B. skin
C. form
D. none of these

Answer: Option C

Explanation:

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20. 

Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency)

A. ηma x ηm x ηv = ηo
B. ηm = ηv . ηma
C. ηma = ηm x ηv
D. ηv = ηm x ηma

Answer: Option B

Explanation:

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