Chemical Engineering MCQs

Page No. 102

Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?


a0

✓


b∞

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c+ve

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d-ve

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View Answer 0

To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 – 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?


aVolume of the liquid phase is negligible compared to that of vapour phase

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bVapour phase behaves as an ideal gas

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cHeat of vaporisation is independent of temperature

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dAll A , B. & C.

✓


View Answer All A , B. & C.

For a given substance at a specified temperature, activity is ______________ to fugacity?


aDirectly proportional

✓


bInversely proportional

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cEqual

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dNone of these

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View Answer Directly proportional

Linde gas liquefaction process employs cooling ____________________?


aBy throttling

✓


bBy expansion in an engine

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cAt constant pressure

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dNone of these

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View Answer By throttling

In the reaction, C + O2 → CO2; ΔH = – 94 kcal. What is the heat content (enthalpy) of O2 ?


a-94 kcal

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b> -94 kcal

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c< – 94 kcal

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d Zero

✓


View Answer Zero

Refrigeration cycle_________________?


aViolates second law of thermodynamics

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b Involves transfer of heat from low temperature to high temperature

✓


c Both A. and B

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dNeither A. nor B

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Measurement of thermodynamic property of temperature is facilitated by ____________ law of thermodynamics?


a1st

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bZeroth

✓


c3rd

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dNone of these

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View Answer Zeroth

The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?


a Isobaric

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bIsothermal

✓


cAdiabatic

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d None of these

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View Answer Isothermal

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?


aΔ S1 is always Δ SR

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bΔ S1 is always > Δ SR

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cΔ S1 is always = Δ SR

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dΔ S1 is always = Δ SR

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Which of the following equations is used for the prediction of activity co-efficient from experiments ?


aVan Laar equation

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bMargules equation

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cWilson’s equation

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dAll A, B. and C

✓


View Answer All A, B. and C

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