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Chemical Engineering Thermodynamics Questions with Correct Answers
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Chemical Engineering Thermodynamics Questions with Correct Answers
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Chemical Engineering Thermodynamics Questionswith Correct Answers
Maximum work that could be secured by expanding the gas over a given
pressure range is the__________work. Correct Answer-isothermal
Internal energy change of a system over one complete cycle in a cyclic
process is Correct Answer-zero
Heating of water under atmospheric pressure is an __________ process.
Correct Answer-isobaric
Van Laar equation deals with the activity co-efficients in Correct
Answer-binary solutions
High __________ is an undesirable property for a good refrigerant.
Correct Answer-viscosity
Solubility of a substance which dissolves with an increase in volume and
liberation of heat will be favoured by the Correct Answer-low pressure
and low temperature.
Entropy is a measure of the __________ of a system. Correct Answer-
disorder
A chemical reaction will occur spontaneously at constant pressure and
temperature, if the free energy is Correct Answer-negative
,Fundamental principle of refrigeration is based on the __________ law
of thermodynamics. Correct Answer-second
For a spontaneous process, free energy Correct Answer-decreases
whereas the entropy increases
A refrigeration cycle is a reversed heat engine. Which of the following
has the maximum value of the co-efficient of performance (COP) for a
given refrigeration effect? Correct Answer-Carnot refrigeration cycle.
In a working refrigerator, the value of COP is always Correct Answer-
>1
__________ increases with increase in pressure. Correct Answer-The
melting point of wax; The boiling point of a liquid
A refrigerator may be termed as a Correct Answer-heat pump
For a stable phase at constant pressure and temperature, the fugacity of
each component in a binary system __________ as its mole fraction
increases. Correct Answer-increases
Which of the following is not an intensive property? Correct Answer-
Heat capacity
,Out of the following refrigration cycles, which one has the minimum
COP (Co-efficient of performance)? Correct Answer-Air cycle
Measurement of thermodynamic property of temperature is facilitated by
__________ law of thermodynamics. Correct Answer-zeroth
The theoretical minimum work required to separate one mole of a liquid
mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane
into pure compounds each at 1 atm is... Correct Answer--RT ln 0.5
Keeping the pressure constant, to double the volume of a given mass of
an ideal gas at 27°C, the temperature should be raised to __________
°C. Correct Answer-327
Entropy of an ideal gas depends upon its Correct Answer-Pressure and
Temperature
Isobaric process means a constant process. Correct Answer-pressure
No work is done by the system, when a reaction occurs at constant
Correct Answer-volume
If the vapour pressure at two temperatures of a solid phase in
equilibrium with its liquid phase are known, then the latent heat of
fusion can be calculated by the Correct Answer-Clayperon-Claussius
equation
, The freezing point of a liquid decreases when the pressure is increased,
if the liquid __________ while freezing. Correct Answer-contracts
"At the absolute zero temperature, the entropy of every perfectly
crystalline substance becomes zero". This follows from the Correct
Answer-third law of thermodynamics
During Joule-Thomson expansion of gases Correct Answer-enthalpy
remains constant.
The accentric factor of a materical, 'ω', is defined as ω = -
log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr =
reduced temperature. The value of accentric factor is always Correct
Answer-< 1
Degrees of freedom at triple point will be Correct Answer-0
"Law of corresponding states" says that Correct Answer-two different
gases behave similarly, if their reduced properties (i.e. P, V and T) are
same.
Linde gas liquefaction process employs cooling Correct Answer-by
throttling
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