chemical engineering MCQs – Page 430

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 Review each marked answer and report any item that may be outdated or unclear.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

8581. Clausius Clapeyron equation applies to the _____________ process?
0

A. All A., B. & C.

B. Sublimation

C. Melting

D. Vaporisation

8582. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?
0

A. 0.58

B. 0.2

C. 1.72

D. 0.5

8583. Cp is expressed in S.I. unit as_______________?
0

A. J/kg.K

B. W/m.K

C. 0K

D. W/m2.C

8584. Volume occupied by one gm mole of a gas at S.T.P. is ____________________?
0

A. 22.4 c.c

B. 359 litres

C. 22.4 litres

D. 22400 litres

8585. Pick out the correct statement?
0

A. An ideal gas on expansion in vacuum gets heated up

B. A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

C. A real gas on expansion in vacuum gets heated up

D. An ideal gas on expansion in vacuum gets cooled

8586. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?
0

A. Do work equal to loss in kinetic energy

B. Do not lose energy on collision

C. Do not exert attractive force on each other

D. Are above the inversion temperature

8587. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?
0

A. 0

B. 0.24

C. 0.18

D. 1

8588. Unit of mass velocity is___________________?
0

A. kg/m.hr

B. kg/m2.hr

C. kg/hr

D. kg/m2

8589. What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?
0

A. AB3

B. A2B

C. A2B3

D. AB2

8590. The density of a gas X is twice that of another gas Y. If the molecular weight of gas Y is M; then the molecular weight of the gas X will be________________?
0

A. M/2

B. 2M

C. M/4

D. M

8591. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?
0

A. 10

B. 100

C. 10000

D. 1000

8592. Baffles are provided in heat exchangers to____________?
0

A. Remove dirt

B. Reduce heat transfer rate

C. Increase heat transfer rate

D. Reduce vibrations

8593. The vapour pressure of water is given by, in Psat = A (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50C is approximately__________________?
0

A. 0.07

B. 0.09

C. 0.13

D. 0.11

8594. At a temperature of 0K, the molecules of a gas have only _______________ energy?
0

A. Translational

B. Vibrational

C. None of these

D. Rotational

8595. Pick out the wrong statement ?
0

A. The expansion of a gas in vacuum is an irreversible process

B. Entropy change for a reversible adiabatic process is zero

C. An isometric process is a constant pressure process

D. Free energy change for a spontaneous process is negative

8596. Giga stands for__________________?
0

A. 1012

B. 1015

C. 12-Oct

D. 109

8597. Pick out the wrong statement?
0

A. System (of partially miscible liquid pairs), in which the mutual solubility increases with rise

B. temperature, are said to possess an upper consolute temperature

C. Systems, in which the mutual solubility increases with decrease in temperature, are said to

D. sess lower consolute temperature

E. Nicotine-water system shows both an upper as well as a lower consolute temperature,

F. lying that they are partially miscible between these two limiting temperatures

8598. N.T.P. corresponds to__________________?
0

A. 760 mm Hg gauge pressure & 0C

B. 1 atm absolute pressure & 0C

C. 101.325 KPa gauge pressure & 0C

D. 760 torr & 15C

8599. Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?
0

A. St

B. 1/St

C. Sv

D. 1/Sv

8600. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?
0

A. 380

B. 880

C. 760

D. 630

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