Chemical Engineering MCQs

Page No. 161

________________ decreases during adiabatic throttling of a perfect gas?


aEntropy

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bTemperature

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cEnthalpy

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dPressure

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View Answer Pressure

Change of state namely evaporation condensation, freezing and melting is an _______________ process?


a Isothermal

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bAdiabatic

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cIsobaric

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dIsochoric

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View Answer Isothermal

Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?


aWork required to refrigeration obtained

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bRefrigeration obtained to the work required

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cLower to higher temperature

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dHigher to lower temperature

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Claude gas liquefaction process employs cooling___________________?


aAt constant pressure

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b By throttling

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cBy expansion in an engine

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dNone of these

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Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________?


a Same

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bDoubled

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cHalved

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dOne fourth of its original value

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View Answer Same

The activity of an ideal gas is numerically ____________ its pressure?


aMore than

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bLess than

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cEqual to

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dData insufficient, can’t be predicted

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View Answer Equal to

Any substance above its critical temperature exists as _____________________?


aSaturated vapour

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bSolid

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c Gas

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dLiquid

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View Answer Gas

Clausius-Clapeyron Equation gives accurate result, when the __________________?


aVapour pressure is relatively low and the temperature does not vary over wide limits

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bVapour obeys the ideal gas law and the latent heat of vaporisation is constant

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c Volume in the liquid state is negligible compared with that in the vapour state

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dAll A, B. and C

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View Answer All A, B. and C

The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?


a0

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b+ve

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c-ve

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d∞

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View Answer +ve

In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?


aAdiabatic

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bReversible

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c Isothermal

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dNone of these

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View Answer Isothermal

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