Chemical Engineering MCQs

Page No. 186

S.T.P. corresponds to _________________?


a1 atm. absolute pressure & 15.5°C

✓


b760 mm Hg gauge pressure & 15.5°C

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c760 torr & 0°C

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d101.325 kPa gauge pressure & 15.5°C

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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_____________________?


a0.5

✓


b1

✖


c2

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d0.66

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View Answer 0.5

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) ?


ax

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b√(πx)

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c√(2x)

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d√(x/2)

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View Answer x

Hydraulic intensifier is used for increasing the ___________________?


aRate of velocity of liquid supply

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bRate of flow through delivery pipeline of a pump

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cIntensity of pressure of the liquid

✓


dMomentum rate through delivery pipe

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


aGreater than the vapour pressure of the liquid

✓


bLess than the vapour pressure of the liquid

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cEqual to the vapour pressure of the liquid

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dLess than barometric pressure

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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_________________?


a0.3

✓


b0.9

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c0.03

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d0.66

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View Answer 0.3

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


aConvert velocity head to pressure head

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bConvert pressure head to velocity head

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cReduce the discharge fluctuation

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dIncrease the discharge

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Air vessel provided in a reciprocating pump__________________?


aSmoothens the flow by avoiding pulsations

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bIncreases the volumetric efficiency of the pump

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cSaves the pump from the danger of cavitation

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dNone of these

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View Answer None of these

The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?


a15.5

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b16

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c16.5

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d 17

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View Answer 16.5

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


a160

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b120

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c80

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d40

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View Answer 40

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