Up To Date Chemical Engineering MCQs – Competitive Thermodynamics MCQs
This post is comprising of latest ” Thermodynamics MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest chemical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding chemical engineering then read these mcqs of Design of Steel Structures.
Latest Chemical Engineering MCQs
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Latest Thermodynamics Mcqs
The most occurred mcqs of Thermodynamics in past papers. Past papers of Thermodynamics Mcqs. Past papers of Thermodynamics Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Thermodynamics Mcqs. The Important series of Thermodynamics Mcqs are given below:
For a constant volume process_________________?
A.dQ = dE + pdV
B. dE = CvdT
C. dE = CpdT
D. dW = pdV
Fundamental principle of refrigeration is based on the ______________ law of thermodynamics?
A. First
B. Zeroth
C. Second
D. Third
Entropy change in case of reversible adiabatic process is________________?
A. Maximum
B. Zero
C. Minimum
D. Indeterminate
Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________________?
A. P + F – C = 2
B. F = C – P – 2
C. C = P – F + 2
D. P = F – C – 2
Gases are cooled in Joule-Thomson expansion, when it is _____________ inversion temperature?
A. Below
B. Above
C. At
D. Either B. or C.
The amount of heat required to decompose a compound into its elements is _____________ the heat of formation of that compound from its elements?
A. More than
B. Less than
C. Same as
D. Not related to
In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is_______________?
A. Less
B. More
C. Same
D. Unpredictable; depends on the particular reaction
Which of the following is a thermodynamic property of a system ?
A. Mass
B. Concentration
C. Temperature
D. Entropy
As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches_______________________?
A. Infinity
B. Zero
C. That of the heat of reaction
D. Unity
PVy = constant, holds good for an isentropic process, which is_________________?
A. Isothermal and irreversible
B. Reversible and isothermal
C. Reversible and adiabatic
D. Adiabatic and irreversible
With increase in pressure (above atmospheric pressure), the Cp of a gas_____________________?
A. Increases
B. Remains unchanged
C. Decreases
D. First decreases and then increases
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be _______________?
A. More
B. Same
C. Less
D. Data insufficient to predict
Boyle’s law for gases states that____________________?
A. P/V = constant, for any gas
B. P ∝ 1/V, when temperature & mass of the gas remain constant
C. P ∝ V, at constant temperature & mass of the gas
D. P ∝ 1/V, when temperature is constant
Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called ____________ solutions?
A. Ideal
B. Isotonic
C. Real
D. None of these
A system in which there is exchange of energy but not of mass, is called a/an ____________ system?
A. Open
B. Isolated
C. Insulated
D. Closed
In a reversible process__________________?
A. Tds = dE + dW
B. dW – dE = Tds
C. dE – dW = Tds
D. Tds – dW + dE >0
Thermodynamics Mcqs
Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a __________________?
A. Straight line
B. Parabola
C. Sine curve
D. Hyperbola
Number of phases in a colloidal system is_____________________?
A. 3
B. 2
C. 1
D. 4
What happens in a reversible adiabatic expansion process ?
A. Pressure is constant
B. Cooling takes place
C. Heating takes place
D. Temperature is constant
The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is__________________?
A.Equal
B. More pronounced
C. Less pronounced
D. Data insufficient, can’t be predicted
Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of___________________?
A. Formation
B. Vaporisation
C. Solution
D. Sublimation
Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?
A. Remains constant
B. Increases
C. Decreases
D. Decreases logarithmically
The principle applied in liquefaction of gases is_____________________?
A. Joule-Thomson effect
B. Adiabatic expansion
C. Both A. and B
D. Neither A. nor B
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?
A. Increase
B. Remain same
C. Decrease
D. Increase in summer and will decrease in winter
_____________ law of thermodynamics ascertains the direction of a particular spontaneous process?
A. First
B. Zeroth
C. Second
D. Third
Entropy change for an irreversible isolated system is__________________?
A. 0
B. ∞
C. < 0
D. > 0
The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only?
A. Temperature
B. Volume
C. Specific heat
D. Pressure
An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to_________________?
A. 6 P1 V1
B. 12 P1V1
C. 3 P1V1
D. P1 V1
The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?
A. T1/(T1-T2)
B. T1/T2
C. T2/(T1-T2)
D. T2/R1
In an irreversible process________________?
A. dE – dW – Tds = 0
B. Tds = dE – dW = 0
C. Tds – dE + dW < 0
D. Tds – dT + dW < 0
When pressure is applied on the system, ice ↔ water, then_________________?
A. More ice will be formed
B. Equilibrium cannot be established
C. More water will be formed
D. Evaporation of water will take place
For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________?
A. Cp.dT
B. Cv.dT
C. ∫ Cp.dT
D. ∫ Cv.dT
Work done is a____________________?
A. Point function
B. Path function
C. Property of the system
D. State description of a system
Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?
A. T2/(T1 – T2)
B. (T1 – T2)/T1
C. T1/(T1 – T2)
D. (T1 – T2)/T2
After throttling, gas temperature___________________?
A. Decreases
B. Remain same
C. Increases
D. May increase or decrease; depends on the nature of the gas
If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will___________________?
A. Decrease
B. Increase
C. Remain unaltered
D. Increase or decrease; depends on the particular reaction
The thermodynamic law, PVy = constant, is not applicable in case of______________?
A. Adiabatic expansion of steam in a turbine
B. Free expansion of an ideal gas
C. Ideal compression of air
D. Adiabatic compression of a perfect gas
For an ideal gas, the chemical potential is given by______________?
A. RT d ln P
B. R d ln f
C. R d ln P
D. None of these
Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?
A. The same
B. Greater than
C. Less than
D. Different than
Specific heat of a gas for a reversible adiabatic process is________________?
A. Infinity
B. Zero
C. Negative
D. None of these
Chemical Process Mcqs
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?
A. (∂S/∂P)T = – (∂V/∂T)P
B. (∂T/∂V)S = – (∂P/∂S)V
C. (∂V/∂S)P = (∂T/∂P)S
D. (∂S/∂V)T = (∂P/∂T)V
A gas shows deviation from ideal behaviour at______________?
A. Low pressure and low temperature
B. Low pressure and high temperature
C. Low temperature and high pressure
D. High temperature and high pressure
Entropy of the system decreases, when_______________?
A. Snow melts into water
B. Water is converted into ice
C. A gas expands spontaneously from high pressure to low pressure
D. Both B. & C
Partial molar free energy of an element A in solution is same as its__________________?
A. Chemical potential
B. Fugacity
C. Activity
D. Activity co-efficient
Which of the following has the minimum value of COP for a given refrigeration effect ?
A. Ordinary vapour-compression cycle
B. Reverse Carnot cycle
C. Vapour-compression process with a reversible expansion engine
D. Air refrigeration cycle
The expression, nCv(T2 – T1), is for the _____________ of an ideal gas?
A. Work done under adiabatic condition
B. Compressibility
C. Co-efficient of thermal expansion
D. None of these
Specific/molar Gibbs free energy for a pure substance does not change during________________?
A. Vaporisation
B. Sublimation
C. Melting
D. Either A, B. or C.
4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?
A. 4 J
B. 8 J
C. 0
D. ∞
One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one ________________?
A. Minute
B. Day
C. Hour
D. Second
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?
A. 1.26
B. 0
C. -1.87
D. 3.91
In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________?
A. Increase the partial pressure of I2
B.Increase the partial pressure of H2
C. Increase the total pressure and hence shift the equilibrium towards the right
D. Not affect the equilibrium conditions
Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________?
A. T
B.T2
C. √T
D. 1/√T
is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ?
A. The amount of work needed is path dependent
B. The amount of work needed is independent of path
C. Work alone cannot bring out such a change of state
D. More information is needed to conclude anything about the path dependence or otherwise of the work needed
The four properties of a system viz. P, V, T, S are related by ______________ equation?
A. Gibbs-Helmholtz
B. Gibbs-Duhem
C. Maxwell’s
D. None of these
Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?
A. Solid-liquid
B. Solid-vapor
C. Liquid-vapor
D. All A, B. and C
During the phase transition, _______________ changes?
A. Temperature
B. Volume
C. Pressure
D. All A , B. and C
The activity of an ideal gas is numerically ____________ its pressure?
A. Less than
B. More than
C. Equal to
D. Data insufficient, can’t be predicted
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
B. Halved
C. Doubled
D. One fourth of its original value
Chemical Environmental Engineering Mcqs
Claude gas liquefaction process employs cooling___________________?
A. By throttling
B. At constant pressure
C. By expansion in an engine
D. None of these
Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?
A.Lower to higher temperature
B. Refrigeration obtained to the work required
C. Work required to refrigeration obtained
D. Higher to lower temperature
Change of state namely evaporation condensation, freezing and melting is an _______________ process?
A. Isothermal
B. Isobaric
C. Adiabatic
D. Isochoric
________________ decreases during adiabatic throttling of a perfect gas?
A.Temperature
B. Entropy
C. Enthalpy
D. Pressure
The first law of thermodynamics is a restatement of the law of conservation of_________________?
A. Momentum
B. Energy
C. Mass
D. None of these
A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?
A. Sub-cooled
B. Non-solidifiable
C. Saturated
D. None of these
The unit of equilibrium constant of a chemical reaction is the same as that of__________________?
A. Temperature
B. Molar concentration
C. Internal energy
D. None of these
The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?
A. R loge 4
B. Cv log10 4
C. R log10 4
D. Cv loge 4
(∂H/∂T)P is the mathematical expression for____________________?
A.Entropy change
B. CV
C. Gibbs free energy
D. None of these
With increase in temperature, the internal energy of a substance___________________?
A. Increases
B. Remains unchanged
C. Decreases
D. May increase or decrease; depends on the substance
All gases above its inversion temperature, in a throttling process will show__________________?
A. A heating effect
B. A cooling effect
C. No change in temperature
D. Either A. or (C)
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?
A. 50
B. 100
C. 205
D. 200