chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 21

Practise multiple-choice questions from chemical engineering thermodynamics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering thermodynamics for chemical chemical engineering Mcqs

401. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?
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A. V1 V2

B. V2/V1

C. V1/V2

D. V1.V2

402. In the equation, PVn = constant, if the value of n = ?, then it represents a reversible _____________ process?
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A. Adiabatic

B. Isometric

C. Isentropic

D. Isothermal

403. Pick out the wrong statement?
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A. The net change in entropy in any reversible cycle is always zero

B. The entropy of a substance does not remain constant during a reversible adiabatic change

C. The entropy of the system as a whole in an irreversible process increases

D. The entropy of the universe tends to a maximum

404. 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___________________?
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A. Increase

B. Increase or decrease; depends on the particular reaction

C. Remain unaltered

D. Decrease

405. In the reaction, H2 +I2 ? 2HI, addition of an inert gas will___________________?
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A. Increase the total pressure and hence shift the equilibrium towards the right

B. Increase the partial pressure of I2

C. Increase the partial pressure of H2

D. Not affect the equilibrium conditions

406. Pick out the correct statement?
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A. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression

B. put of work

C. Compression ratio of an Otto engine is comparatively higher than a diesel engine

D. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work

E. io</strong>

F. duced per quantity of heat

407. A solid metallic block weighing 5 kg has an initial temperature of 500C. 40 kg of water initially at 25C 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_________________?
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A. 0

B. -1.87

C. 1.26

D. 3.91

408. Which of the following has the minimum value of COP for a given refrigeration effect ?
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A. Reverse Carnot cycle

B. Ordinary vapour-compression cycle

C. Air refrigeration cycle

D. Vapour-compression process with a reversible expansion engine

409. Pick out the wrong statement ?
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A. rogen is 4

B. Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and

C. Enthalpy and internal energy change is zero during phase change processes like melting,

D. For a two phase system in equilibrium made up of four non-reacting chemical species, the

E. ber of degrees of freedom is 4

F. orisation and sublimation</strong>

410. Free energy change at equilibrium is____________________?
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A. Negative

B. Indeterminate

C. Zero

D. Positive

411. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?
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A. 2

B. 1

C. 0

D. 3

412. Extensive properties of a thermodynamic system depend upon the _____________ of the system?
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A. Specific volume

B. Temperature

C. Pressure

D. Mass

413. Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?
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A. More than

B. Same as

C. Half

D. Less than

414. 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___________________?
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A. Same

B. Doubled

C. Halved

D. One fourth of its original value

415. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
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A. Increased COP

B. Decreased COP

C. Same COP

D. Increased or decreased COP; depending upon the type of refrigerant

416. The first law of thermodynamics is a restatement of the law of conservation of_________________?
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A. Energy

B. None of these

C. Momentum

D. Mass

417. The number of degrees of freedom for a mixture of ice and water (liquid) are ____________________?
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A. 2

B. 0

C. 3

D. 1

418. The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?
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A. Decreases

B. Remains unchanged

C. Decreases linearly

D. Increases

419. Specific/molar Gibbs free energy for a pure substance does not change during________________?
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A. Vaporisation

B. Sublimation

C. Either A, B. or C.

D. Melting

420. Clausius-Clapeyron Equation gives accurate result, when the __________________?
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A. Vapour obeys the ideal gas law and the latent heat of vaporisation is constant

B. All A, B. and C

C. Volume in the liquid state is negligible compared with that in the vapour state

D. Vapour pressure is relatively low and the temperature does not vary over wide limits

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