Chemical Engineering MCQs

Page No. 211

A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, η0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?


a10 KPa

✖


b20 KPa

✓


c30 KPa

✖


d40 KPa

✖


View Answer 20 KPa

The Prandtl Pitot tube measures the__________________?


aVelocity at a point in the flow

✓


bPressure at a point

✖


cAverage flow velocity

✖


dPressure difference in pipe flow

✖



Dimension of absolute viscosity is_________________?


aML-1T-1

✓


bMLT-1

✖


cML-1T

✖


dMLT

✖


View Answer ML-1T-1

Purpose of hydraulic accumulator is to_______________?


aEnsure intermittent supply of hydraulic pressure

✖


bIncrease the pressure and store/ accumulate it

✖


cAccumulate pressure to increase force

✖


dGenerate high pressure to operate hydraulic machines like cranes, lifts, presses etc

✓



All pipes of a particular nominal size have the same_________________?


aInside diameter

✖


bOutside diameter

✓


cThickness

✖


dNone of these

✖


View Answer Outside diameter

What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta ?


a0.64

✓


b1.65

✖


c0.32

✖


d0.94

✖


View Answer 0.64

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ?


aVs/Dp2

✓


bVs2/Dp2

✖


cVs2/Dp3

✖


dVs/Dp3

✖


View Answer Vs/Dp2

Vena-contracta formed during flow of a liquid through an orificemeter has__________________?


aMinimum liquid cross-section

✓


bMore diameter compared to orifice diameter

✖


cMinimum velocity of fluid stream

✖


dNone of these

✖



The pitot static tube does not measure the _____________ pressure?


aStatic

✖


bTotal

✖


cDifference in static & dynamic

✖


dAll A., B. and C.

✓


View Answer All A., B. and C.

The unit of dynamic viscosity in SI unit is__________________?


akg/m. sec

✓


bN/m2

✖


cm2 /sec

✖


dm/N. sec

✖


View Answer kg/m. sec

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