Fluid Mechanics - Chemical Engineering Questions and Answers

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Check valve is used for __________ flow.

very precise control of

unidirectional

multidirectional

none of these

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Capacity of a rotary gear pump can be varied by

changing the speed of rotation.

bleeding air into suction.

bypassing liquid from the suction or discharge line.

all (a), (6) and (c).

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For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.

brings about no further reduction of

increases

decreases

none of these

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Power number is the ratio of

drag stress to inertial stress.

inertial stress to drag stress.

inertial stress to gravitational stress.

gravitational stress to drag stress.

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The momentum correction factor for the velocity distribution of laminar flow is

1.3

1.66

2.5

none of these

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For the same flow rate of a fluid, the pressure drop is the least for

venturimeter

orificemeter

flow-nozzle

Δp is same for all

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The valve commonly used in pipes larger than 2" dia is a

globe valve

plug-cock

gate valve

check valve

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Foot valves are provided in the suction line of a centrifugal pump to

avoid priming, every time we start the pump.

remove the contaminant present in the liquid.

minimise the fluctuation in discharge.

control the liquid discharge.

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An ideal fluid is

frictionless & incompressible.

one, which obeys Newton's law of viscosity.

highly viscous.

none of these.