chemical engineering MCQs – Page 426

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8501. The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.K are________________?
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A. 5 & 3

B. 1.987 & 0.66

C. 3.987 & 1.987

D. 0.66 & 1.987

8502. Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. K___________________?
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A. ?

B. 100

C. 0

D. 50

8503. If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ?H for the reaction CH4(g) + C2H4(g) ? C3H8(g) will be _____________ Kcal?
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A. -30.2

B. -19.4

C. -55.2

D. 55.2

8504. Heat pump_______________________?
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A. Accomplishes only space heating in winter

B. Accomplishes only space cooling in summer

C. Accomplishes both A. and B

D. Works on Carnot cycle

8505. Enthalpy H is defined as___________________?
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A. H E = PV

B. H = F TS

C. None of these

D. H = E PV

8506. At the critical point of a substance____________?
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A. The surface tension vanishes

B. There is no distinction between liquid and vapour phases

C. Liquid and vapour have the same density

D. All A, B. and C
8507. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?
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A. Xc < Xs

B. Xc greater/less than Xs depending on the length of the cylinder

C. Xc = Xs

D. Xc > Xs

8508. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be _______________?
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A. Same

B. Less

C. Data insufficient to predict

D. More
8509. 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_______________?
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A. Same

B. Less

C. Unpredictable; depends on the particular reaction

D. More

8510. The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system?
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A. Lowest

B. Average

C. None of these

D. Highest

8511. With increase in pressure (above atmospheric pressure), the Cp of a gas_____________________?
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A. Remains unchanged

B. First decreases and then increases

C. Decreases

D. Increases
8512. The expression, ?G = nRT. ln(P2/P1), gives the free energy change______________?
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A. With pressure changes at constant temperature

B. Under reversible isothermal volume change

C. During cooling of an ideal gas

D. During heating of an ideal gas

8513. During the phase transition, _______________ changes?
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A. Temperature

B. Pressure

C. Volume

D. All A , B. and C

8514. In the reaction, represented by, 2SO2 + O2 ? 2SO3; ?H = 42 kcal; the forward reaction will be favoured by____________________?
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A. Low temperature

B. High pressure

C. Both A. and B

D. Neither A. nor B

8515. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?
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A. 50

B. 200

C. 205

D. 100

8516. The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes. This is the _____________ law?
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A. Amagats

B. Avogadros

C. Gay-Lussacs

D. Daltons

8517. In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc ?
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A. None of these

B. 2HI ? H2 + I2

C. N2O4 ? 2NO2

D. 2SO2 + O2 ? 2SO3

8518. Claude gas liquefaction process employs cooling___________________?
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A. At constant pressure

B. By throttling

C. None of these

D. By expansion in an engine
8519. 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 or decrease; depends on the particular reaction

B. Increase

C. Remain unaltered

D. Decrease

8520. 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 _________________?
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A. Clausius-Clapeyron Equation

B. Nernst Heat Theorem

C. Maxwells equation

D. Van Laar equation