Exam (elaborations)
Chemical Engineering Thermodynamics Guide Questions and Answers 2024
- Module
- Institution
Chemical Engineering Thermodynamics Guide
[Show more]
Seller
Follow
julianah420
Reviews received
Content preview
Chemical Engineering ThermodynamicsGuide
Isothermal - answer Maximum work that could be secured by expanding the gas over a
given pressure range is the __________ work.
-isothermal
-adiabatic
-isentropic
-none of these
zero
(Internal energy is a state function, cycling back to the initial state means no change) -
answerInternal energy change of a system over one complete cycle in a cyclic process
is
-zero
-+ve
- -ve
-dependent on the path
Isobaric
(atmospheric pressure is always constant) - answerHeating of water under atmospheric
pressure is an __________ process.
isochoric
isobaric
adiabatic
isothermal
Binary Solutions - answerVan Laar equation deals with the activity co-efficients in
binary solutions
ternary solutions
azeotropic mixture only
none of these
Viscosity - answerHigh __________ is an undesirable property for a good refrigerant.
,specific heat
latent heat of vaporisation
viscosity
specific vapor volume
Low pressure/Low temperature
( reduce pressure = increase in volume)
(low temp = Increase heat loss from the system) - answerSolubility of a substance
which dissolves with an increase in volume and liberation of heat will be favoured by the
-low pressure and high temperature.
-low pressure and low temperature.
-high pressure and low temperature.
-high pressure and high temperature.
disorder - answerEntropy is a measure of the __________ of a system.
disorder
orderly behaviour
temperature changes only
none of these
negative - answerA chemical reaction will occur spontaneously at constant pressure
and temperature, if the free energy is
zero
positive
negative
none of these
second
(Taken from Classius Statement: "Heat cannot flow from cold to hot without external
work") - answer.
Fundamental principle of refrigeration is based on the __________ law of
thermodynamics.
zeroth
first
second
third
decreases whereas the entropy increases - answerFor a spontaneous process, free
energy
,-is zero
-increases
-decreases whereas the entropy increases
-and entropy both decrease
Carnot refrigeration cycle.
(Max efficiency is always Carnot) - answerA 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 ?
-Vapor compression cycle using expansion valve.
-Air refrigeration cycle.
-Vapor compression cycle using expansion engine.
-Carnot refrigeration cycle.
>1
(COP is the inverse of heat engine efficiency, and heat engine efficiency is always less
than 1 so COP is always greater than 1) - answerIn a working refrigerator, the value of
COP is always
0
<0
<1
>1
both (a) and (b) - answer__________ increases with increase in pressure.
-The melting point of wax
-The boiling point of a liquid
-both (a) and (b)
-neither (a) nor (b
heat pump
(Heat is "pumped" from a cold body to a hot body) - answerA refrigerator may be
termed as a
heat pump
heat engine
Carnot engine
none of these
increases
, (Lewis-Randall rule: fugacity of component in an ideal solution is directly proportional to
the mole fraction of the component in the solution. ) - answerFor a stable phase at
constant pressure and temperature, the fugacity of each component in a binary system
__________ as its mole
fraction increases.
-decreases
-increases
-remains same
-decreases linearly
Heat capacity
(The values of heat capacity are different in mass and molar values so it is influenced
by the amount of substance) - answerWhich of the following is not an intensive
property ?
-Chemical potential
-Surface tension
-Heat capacity
-None of these
Air Cycle
(Air has less specific heat value and it requires more space for heat transfer) -
answerOut of the following refrigration cycles, which one has the minimum COP (Co-
efficient of performance)?
-Air cycle
-Carnot cycle
-Ordinary vapour compression cycle
-Vapour compression with a reversible expansion engine
zeroth - answerMeasurement of thermodynamic property of temperature is facilitated by
__________ law of thermodynamics.
1st
zeroth
3rd
none of these
-RT ln 0.5 - answerThe 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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £12.56. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
64438 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now