Chemical Engineering MCQs

Page No. 189

Draining of shallow pits or sump is done by a sump pump, which is a ______________ pump?


aSingle stage vertical

✓


bCentrifugal

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cPlunger

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dDiffuser

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View Answer Single stage vertical

In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?


aRotational

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bUnsteady

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cTurbulent

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dNon-uniform

✓


View Answer Non-uniform

Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ?


af = 0.079.NRe-0.25

✓


bf-0.5 = 4.07 loge (NRef)-0.6

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cBoth ‘a’ and ‘b’

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dNone of these

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View Answer f = 0.079.NRe-0.25

A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?


aInertial and drag forces are important

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bDrag, gravitational and buoyancy forces are important

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cDrag force and gravitational forces are important

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dNone of the above

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Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?


a1/9

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b 8/9

✓


c1/2

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d5/9

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View Answer 8/9

Isotropic turbulence occurs __________________?


aWhere there is no velocity gradient

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bAt higher temperatures

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cOnly in Newtonian fluids

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dNone of these

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Specific speed of a centrifugal pump relates it with another pump having the___________________?


aDynamic similarity

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bSame efficiency

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cSame speed

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dGeometrical similarity

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View Answer Dynamic similarity

No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules____________________?


aCollide without loss of energy

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bDo work equal to loss in kinetic energy

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c Are above the inversion temperature

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dExert no attractive force on each other

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For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?


a√(2gh)

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bC.V. √(2gh)

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cCd √(2gh)

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dCc √(2gh)

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View Answer C.V. √(2gh)

A special type of liquid transporting device is the diffuser pump, in which _____________ are minimised?


aBearing losses

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bDisk friction

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cShock losses

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dCavitation

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View Answer Shock losses

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