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


c760 torr & 0°C


d101.325 kPa gauge pressure & 15.5°C



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


d0.66


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


b√(πx)


c√(2x)


d√(x/2)


View Answer x

Hydraulic intensifier is used for increasing the ___________________?


aRate of velocity of liquid supply


bRate of flow through delivery pipeline of a pump


cIntensity of pressure of the liquid


dMomentum rate through delivery pipe



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


cEqual to the vapour pressure of the liquid


dLess than barometric pressure



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


c0.03


d0.66


View Answer 0.3

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


aConvert velocity head to pressure head


bConvert pressure head to velocity head


cReduce the discharge fluctuation


dIncrease the discharge



Air vessel provided in a reciprocating pump__________________?


aSmoothens the flow by avoiding pulsations


bIncreases the volumetric efficiency of the pump


cSaves the pump from the danger of cavitation


dNone of these


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


b16


c16.5


d 17


View Answer 16.5

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


a160


b120


c80


d40


View Answer 40

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