Competitive Thermodynamics MCQs – New Chemical Engineering 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:
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________________?
A. Volume
B. Pressure
C. Temperature
D. All A, B. & C
Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?
A. dE = Tds – PdV
B. dQ = CpdT + Vdp
C. dQ = CvdT + PdV
D. Tds = dE – PdV
In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?
A. Reversible
B. Adiabatic
C. Isothermal
D. None of these
The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?
A. -ve
B. +ve
C. 0
D. ∞
Clausius-Clapeyron Equation gives accurate result, when the __________________?
A. Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
B. Vapour pressure is relatively low and the temperature does not vary over wide limits
C. Volume in the liquid state is negligible compared with that in the vapour state
D. All A, B. and C
Any substance above its critical temperature exists as _____________________?
A. Solid
B. Saturated vapour
C. Gas
D. Liquid
Which is not constant for an ideal gas ?
A. (∂P/∂V)T
B. (∂P/∂V)V
C. (∂V/∂T)P
D. All (A), B. & (C)
Refrigeration capacity of a household refrigerator may be round about _____________ tons?
A. 0.15
B. 4.5
C. 1.5
D. 6.5
Boiling of liquid is accompanied with increase in the__________________?
A. Vapor pressure
B. Specific entropy
C. Specific Gibbs free energy
D. All (A), B. and (C)
The number of degrees of freedom for a mixture of ice and water (liquid) are ____________________?
A. 2
B. 3
C. 1
D. 0
Chemical Environmental Engineering Mcqs
Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?
A. Less than
B. More than
C. Same as
D. Half
Which of the following decreases with increase in pressure ?
A. Melting point of ice
B. Boiling point of liquids
C. Melting point of wax
D. None of these
The internal energy of an ideal gas does not change in a reversible _____________ process?
A. Isothermal
B. Isobaric
C. Adiabatic
D. Isometric
In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?
A. Cp > Cv
B. Cp = Cv
C. Cp < Cv
D. C ≥ Cv
The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?
A. Increases
B. Remains unchanged
C. Decreases
D. Decreases linearly
Which of the following is not an equation of state ?
A. Beattie-Bridgeman equation
B. Clausius-Clapeyron equation
C. Bertholet equation
D. None of these
What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?
A. 2
B. 3
C. 0
D. 1
A system is said to be isopiestic, if there is no ______________ change?
A. Volume
B. Pressure
C. Temperature
D. None of these
Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________?
A. (∂S/∂P)T, ni = (∂V/∂T)P, ni
B. (∂T/∂V)S, ni = -(∂P/∂S)V, ni
C. (∂S/∂V)T, ni = (∂P/∂T)V, ni
D. (∂T/∂P)S, ni = (∂V/∂S)P, ni
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
A. A homogeneous solution (say of phenol water) is formed
B. Two liquids are completely separated into two layers
C. Mutual solubility of the two liquids shows a decreasing trend
D. None of these
Which is not a refrigerant ?
A. NH3
B. SO2
C. CCl2F2
D. C2H4Cl2
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is___________________?
A. Same in both the phases
B. More in vapour phase
C. Zero in both the phases
D. More in liquid phase
The value of gas constant ‘R’ is__________________?
A. 1.987 BTU/lb. mole °R
B. 1.987 cal/gm mole °K
C. Both A. and B
D. Neither A. nor B
The unity of Planck’s constant ‘h’ in the equation, E = hv is____________________?
A. J/kmol
B. J.S
C. J/s
D. kmol/J
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?
A. 4.5
B. 3.5
C. 0.5
D. 8.5
In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?
A. 0.75
B. 0.5
C. 0.25
D. 1
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
A. Increased COP
B. Decreased COP
C. Same COP
D. Increased or decreased COP; depending upon the type of refrigerant
(1/V) (∂V/∂T)P is the mathematical expression__________________?
A. Specific heat at constant pressure (Cp)
B. Joule-Thomson co-efficient
C. co-efficient of thermal expansion
D. Specific heat at constant volume (CV)
Domestic refrigerator usually works on the _____________ refrigeration cycle?
A. Air
B. Carnot
C. Absorption
D. vapour-ejection
_______________ functions are exemplified by heat and work ?
A. Path
B. State
C. Point
D. None of these
Chemical potential is a/an_____________________?
A. Extensive property
B. Force which drives the chemical system to equilibrium
C. Intensive property
D. Both B. and C
In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = – 42 kcal; the forward reaction will be favoured by____________________?
A. High pressure
B. Low temperature
C. Both A. and B
D. Neither A. nor B
Extensive properties of a thermodynamic system depend upon the _____________ of the system?
A. Temperature
B. Specific volume
C. Mass
D. Pressure
Chemical Process Mcqs
Free energy change at equilibrium is____________________?
A. Zero
B. Negative
C. Positive
D. Indeterminate
Entropy change of mixing two liquid substances depends upon the_________________?
A. Quantity (i.e. number of moles)
B. Molar concentration
C. Both A. and B
D. Neither A. nor B
Gibbs-Duhem equation_____________________?
A. States that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant temperature and pressure
B. Finds no application in gas-liquid equilibria involved in distillation
C. Applies only to binary systems
D. None of these
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________?
A. 2
B. 1
C. 0
D. 3
What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?
A. TR/(T2 – TR) × (T1 – T2)/T1
B. TR/(T1 – TR) × (T1 – T2)/T1
C. TR/(T2 – TR) × T1/(T1 – T2)
D. None of these
Throttling (Joule-Thomson effect) process is a constant _____________ process?
A. Enthalpy
B. Pressure
C. Entropy
D. None of these
The equation Tds = dE – PdV applies to___________________?
A. Single phase fluid of varying composition
B. Open as well as closed systems
C. Single phase fluid of constant composition
D. Both B. and C
Heat pump_______________________?
A. Accomplishes only space cooling in summer
B. Accomplishes only space heating in winter
C. Accomplishes both A. and B
D. Works on Carnot cycle
For an ideal solution, the value of activity co-efficient is______________________?
A. 2
B. 1
C. 0
Isentropic process means a constant _____________________ process ?
A. Pressure
B. Enthalpy
C. Entropy
D. None of these
Entropy is a/an___________________?
A. Macroscopic property
B. State function
C. Extensive property
D. None of these
If an ideal solution is formed by mixing two pure liquids in any proportion, then the ___________________ of mixing is zero?
A. Volume
B. Enthalpy
C. Both A. & B.
D. Neither A nor B
The temperature at which both liquid and gas phases are identical, is called the _____________ point?
A. Critical
B. Freezing
C. Triple
D. Boiling
Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?
A. Increase
B. Remain unchanged
C. Decrease
D. First fall and then rise
Joule-Thomson co-efficient for a perfect gas is_____________________?
A. Zero
B. Negative
C. Positive
D. None of these
Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?
A. 640
B. 580
C. 1160
D. Data insufficient; can’t be computed
In the ammonia synthesis reaction, N2 + 3H2 ⇌ 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by___________________?
A. Low pressure
B. High temperature
C. Low temperature only
D. Both low temperature and high pressure
Thermodynamics Mcqs
What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?
A. 2
B. 0
C. 1
D. 3
What is the value of ln y (where y = activity co-efficient) for ideal gases ?
A. Zero
B. Infinity
C. Unity
D. Negative
Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?
A. Heat of reaction
B. Calorific value
C. Heat of combustion
D. Heat of formation
For a single component two phase mixture, the number of independent variable properties are_________________?
A. Zero
B. One
C. Two
D. Three
When a gas in a vessel expands, its internal energy decreases. The process involved is________________?
A. Reversible
B. Isothermal
C. Irreversible
D. Adiabatic
The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is__________________?
A. 1
B. ∞
C. 0
D. -ve
Enthalpy ‘H’ is defined as___________________?
A. H = F – TS
B. H = E – PV
C. H – E = PV
D. None of these
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________?
A. its internal energy (U) decreases and its entropy (S) increases
B. U and S both decreases
C. U is constant but S decreases
D. U decreases but S is constant
The chemical potential for a pure substance is ____________ its partial molal free energy?
A. Less than
B. More than
C. Equal to
D. Not related to
The number of degrees of freedom at the triple point of water is__________________?
A. 0
B. 2
C. 1
D. 3
In a turbine, the fluid expands almost_________________?
A. Isobarically
B. Isothermally
C. Adiabatically
D. None of these
Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?
A. Always greater than one
B.Same at the same reduced pressure
C. Same at the same reduced temperature
D. Both B. & C
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?
A. Inversion
B. Boyle
C. Critical
D. Reduced
Mollier diagram is a plot of___________________?
A.Internal Energy vs. enthalpy
B. Temperature vs. enthalpy
C. Entropy vs. enthalpy
D. Temperature vs. internal energy
At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?
A. Less
B. More
C. Same
D. More or less; depending on the system
Equation which relates pressure, volume and temperature of a gas is called the__________________?
A. Equation of state
B. Ideal gas equation
C. Gibbs Duhem equation
D. None of these
Which of the following is not correct for a reversible adiabatic process ?
A. p1-γ.TY = constant
B. TVγ-1 = constant
C. PVγ = constant
D. None of these