Chemical Engineering MCQs

Page No. 242

Drag force on the float of a Rotameter is (where Q = flow rate of the)__________________?


a∝ Q


b∝ √Q


c∝ Q2


dConstant


View Answer Constant

Toothpaste is a__________________?


aBingham plastic


bPseudo-plastic


cNewtonian liquid


dDilatent


View Answer Dilatent

In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________?


aV1.8


bV-0.8


cV


dV-1


View Answer V1.8

Pick out the correct statement pertaining to transition/ entrance length in fluid flow ?


aThe length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length


bTransition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to 0.05. D.NRe


cTransition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is equal to 50 D


dAll A., B. and C.


View Answer All A., B. and C.

Which law/principle of solid mechanics is similar/equivalent to Newton’s law of viscosity in fluid mechanics ?


aArchimedes principle


bNewton’s second law of motion


cHooke’s law


dNewton’s third law of motion


View Answer Hooke’s law

Which of the following is used for very accurate measurement of flow of gas at low velocity ?


aPitot tube


bRotameter


cSegmental orificemeter


dHot wire anemometer


View Answer Hot wire anemometer

The speed of a sound wave in a gas is analogous to the speed of ______________________?


aAn elementary wave in an open channel


bFlow in an open channel


cA disturbance travelling upstream in moving fluid


dNone of these



A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is___________________?


a5


b14.1


c56.22


d28.2


View Answer 28.2

An isentropic process is the one, in which_________________?


apv = constant


bpvr= constant


cpvr = constant, and process is reversible


dNone of these



Pressure drop for turbulent fluid flow through a circular pipe is given by_________________?


a64/Re


b32μLV/gc.D2


c4f (L/D) (v2/2gc). ρ


df (L/D) (v2/2gc). ρ


View Answer 4f (L/D) (v2/2gc). ρ

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