Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 66 of 73)

Attempt Fluid Mechanics for Chemical Quiz

With a constant diameter impeller of a centrifugal pump _____________________?

A. Its capacity varies directly as the square of speed
B. Head varies as the square of speed
C. Horsepower input varies as the square of speed
D. Head varies as the speed

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Which of the following is an undesirable property of a manometric liquid ?

A. Non-sticky & non-corrosive nature
B. High vapour pressure
C. Low viscosity & surface tension
D. Low co-efficient of thermal expansion

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In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?

A. Inverse
B. Square root
C. Second power
D. First power

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The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________?

A. Q∝n : h∝n2 : p∝n3
B. Q∝n2 : h∝n3 : p∝n
C. Q∝n : h∝n3 : p∝n2
D. Q∝n3 : h∝n : p∝n2

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A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?

A. 25.61 kpa
B. 11.77 kpa
C. 14.86 kpa
D. 21.13 kpa

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Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent?

A. 33:3
B. 50
C. 66.6
D. 88.8

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For a reciprocating pump, the indicator diagram is the graph between the________________?

A. Discharge and overall efficiency
B. Volume swept by piston for one complete revolution and the pressure in the cylinder
C. Angle swept by the crank pin at any instant and the discharge
D. None of these

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Power requirement of fans having constant wheel diameter varies _____________ fan speed?

A. As square of
B. Directly as
C. As cube of
D. None of these

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Which is not a variable head meter _________________?

A. Venturimeter
B. Pitot tube
C. Rotameter
D. None of these

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Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of ______________ pressure?

A. Small differential
B. Atmospheric
C. Absolute
D. Gage

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