Fluid Mechanics - Chemical Engineering Questions and Answers

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Which of the following may be termed as a variable orifice flowmeter ?

Rotameter

Pitot tube

V-notch

All (a), (b) and (c)

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In turbulent flow, a rough pipe has the same friction factor as a smooth pipe

in the zone of complete turbulence.

when the roughness projections are much smaller than the thickness of the laminar film.

everywhere in the transition zone.

when the friction factor is independent of the Reynold's number.

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Air vessel provided in a reciprocating pump

smoothens the flow by avoiding pulsations.

increases the volumetric efficiency of the pump.

saves the pump from the danger of cavitation.

none of these.

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Bernoulli's equation is dependent on the

first law of thermodynamics.

third law of thermodynamics.

law of conservation of momentum.

none of these.

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The capacity of an accumulator is the maximum

energy which it can store.

discharge which it can deliver.

liquid which it can store.

none of these.

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With increase in the temperature, viscosity of a liquid

increases

decreases

remains constant

may increase or decrease; depends on the liquid

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Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'

0.5 d

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The pump impeller and the turbine runner in a hydraulic torque converter

have the same diameter.

have different diameters.

are directly coupled.

none of these.

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Reciprocating pumps compared to centrifugal pumps

deliver liquid at uniform pressure.

can handle slurries more efficiently.

are not subject to air binding.

can be operated with delivery valve closed.