Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 57 of 73)

Attempt Fluid Mechanics for Chemical Quiz

Choking in case of pipe flow means that a___________________?

A. Specified mass flow rate cannot be achieved
B. Valve is closed in the line
C. Restriction in flow cross-section area occurs
D. None of these

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The ratio of width to depth for the most economical rectangular section in open channel flow is_________________?

A. 0.5
B. 1
C. 1.5
D. 2

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The pipe wall thickness is minimum for a pipe of given nominal size having schedule number___________________?

A. 160
B. 120
C. 80
D. 40

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Air vessel provided in a reciprocating pump__________________?

A. Smoothens the flow by avoiding pulsations
B. Increases the volumetric efficiency of the pump
C. Saves the pump from the danger of cavitation
D. None of these

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Volute type of casing is provided in a centrifugal pump to___________________?

A. Convert velocity head to pressure head
B. Convert pressure head to velocity head
C. Reduce the discharge fluctuation
D. Increase the discharge

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The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is_________________?

A. 0.3
B. 0.9
C. 0.03
D. 0.66

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Net positive suction head (NPSH) of a centrifugal pump must be____________________?

A. Greater than the vapour pressure of the liquid
B. Less than the vapour pressure of the liquid
C. Equal to the vapour pressure of the liquid
D. Less than barometric pressure

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Hydraulic intensifier is used for increasing the ___________________?

A. Rate of velocity of liquid supply
B. Rate of flow through delivery pipeline of a pump
C. Intensity of pressure of the liquid
D. Momentum rate through delivery pipe

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The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?

A. X
B. √(πx)
C. √(2x)
D. √(x/2)

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The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?

A. 0.5
B. 1
C. 2
D. 0.66

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