Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 47 of 73)

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The ratio of wall drag to total drag in the Stoke’s law range is_________________?

A. 0.5
B. 1
C. 1/3
D. 2/3

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For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

A. Increase
B. Decrease
C. Remain constant
D. Either a. or b.; depends on other factors

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Speed of sound in an ideal gas depends on its________________?

A. Temperature
B. Pressure
C. Specific volume
D. None of these

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Pipes having diameter 14 inches or more are designated by their_________________?

A. Outside diameter
B. Inside diameter
C. Schedule number
D. None of these

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The temperature in isentropic flow_______________?

A. Does not depend on mach number
B. Depends on mach number only
C. Cannot drop and then increase again downstream
D. None of these

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Check valves are used_______________?

A. At high pressure
B. In bends
C. For controlling water flow
D. For unidirectional flow

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A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double___________________?

A. Head
B. Discharge
C. Efficiency
D. None of these

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Boundary layer separation is caused by the_________________?

A. Reduction of pressure to vapour pressure
B. Boundary layer thickness reducing to zero
C. Adverse pressure gradient
D. Reduction of pressure gradient to zero

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If ‘x’ is the depth of flow in an open channel of large width, then the hydraulic radius is equal to________________?

A. X
B. X/2
C. X/3
D. 2x/3

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A differential pressure cell is used for____________________________?

A. Measuring small pressure difference in gases
B. Measuring small pressure difference in liquids
C. Remote recording of pressure difference
D. Measuring the difference of the impact & the static pressure

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