Chemical Engineering MCQs

Page No. 162

Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?


adE = Tds – PdV

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bdQ = CvdT + PdV

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cdQ = CpdT + Vdp

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dTds = dE – PdV

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View Answer dE = Tds – PdV

The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________?


aPressure

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bVolume

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cTemperature

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dAll A, B. & C

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View Answer Temperature

If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?


a100

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b50

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c205

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d200

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View Answer 200

All gases above its inversion temperature, in a throttling process will show__________________?


aA heating effect

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bNo change in temperature

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cA cooling effect

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d Either A. or (C)

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View Answer A heating effect

With increase in temperature, the internal energy of a substance___________________?


aIncreases

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b Decreases

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cRemains unchanged

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dMay increase or decrease; depends on the substance

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View Answer Increases

(∂H/∂T)P is the mathematical expression for____________________?


aCV

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bEntropy change

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cGibbs free energy

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dNone of these

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View Answer None of these

Which of the following is not an equation of state ?


aBertholet equation

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bClausius-Clapeyron equation

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cBeattie-Bridgeman equation

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dNone of these

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The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?


a Increases

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bDecreases

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cRemains unchanged

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dDecreases linearly

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View Answer Increases

In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?


aCp < Cv

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bCp = Cv

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cCp > Cv

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dC ≥ Cv

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View Answer Cp = Cv

The internal energy of an ideal gas does not change in a reversible _____________ process?


aIsothermal

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bAdiabatic

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cIsobaric

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dIsometric

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View Answer Isothermal

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