Chemical Engineering MCQs

Page No. 225

Bernoulli’s equation accounts for the_____________________?


aVarious momentums


bVarious masses


cDifferent forms of mechanical energy


dNone of these



A Newtonian fluid is that__________________?


aWhich follows Newton’s law of motion


bWhich needs a minimum shear, before it starts deforming


cFor which shear & deformation are related as T = μ (∂u/∂y)


dNone of these



A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the power consumed now will be _____________ hp?


a0.5


b2


c4


d1


View Answer 0.5

Power number is the ratio of____________________?


aDrag stress to inertial stress


bInertial stress to drag stress


cInertial stress to gravitational stress


dGravitational stress to drag stress



A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is _____________ kg?


a10


b100


c1000


d10000


View Answer 100

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ?


a< 0.3


b> 3


c50


d1


View Answer < 0.3

Propeller type centrifugal pumps are most suitable for__________________?


aHigh capacity at high heads


bHigh capacity at low heads


cLow capacity at high heads


dLow capacity at low heads



Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?


aTwo


bThree


cFour


dEight


View Answer Four

Disc compensators are provided in large diameter fuel gas carrying pipelines to_________________?


aKeep the pipe in proper orientation


bMake the pipe joint leak-proof


cAccount for contraction/expansion of pipe due to temperature changes of the surroundings


dAccount for the pressure variation side the pipeline



A stream line is___________________?


aFixed in space in steady flow


bAlways the path of particle


cDrawn normal to the velocity vector at every point


dA line connecting the mid points of flow cross-section



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