Chemical Engineering MCQs

Page No. 208

The resistance wire used in a hot wire anemometer for conducting electrical current is made of__________________?


aCopper

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bTungsten

✓


cChromium

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dAluminium

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View Answer Tungsten

The centre of pressure is_________________?


aAlways below the centroid of the area

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bAlways above the centroid of the area

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cA point on the line of action of the resultant force

✓


dAt the centroid of the submerged area

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The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke’s law range is proportional to the_____________________?


aInverse of fluid viscosity

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bSquare of particle size

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cDifference in the densities of the particle & fluid

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dAll A., B. and C.

✓


View Answer All A., B. and C.

The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________?


aWeir

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bPitot tube

✓


cKennison nozzle

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dV-notch

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View Answer Pitot tube

The bulk modulus of elasticity of a liquid__________________?


aIs zero for incompressible liquid

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bDecreases with pressure

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cIs independent of temperature & pressure

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dIncreases with pressure

✓



In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas) ?


a1/√M

✓


b√M

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c1/M

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dM

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View Answer 1/√M

In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as: (where, ‘δ’ is the boundary layer thickness and ‘x’ is the distance from the leading edge in the direction of flow)?


aRe

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b√Re

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c1/Re

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dRe-1/2

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View Answer Re-1/2

An ideal nozzle design aims at________________?


aMinimising wall friction

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bSuppressing boundary layer separation

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

One horsepower is equal to________________?


a550 lbf.ft/second

✓


b550 kgf.m/second

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cBoth A. and B.

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d550 lbf.ft./hr

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View Answer 550 lbf.ft/second

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature) ?


a1/√T

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b1/T

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c√T

✓


dT

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View Answer √T

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