chemical engineering MCQs – Page 427

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 Review each marked answer and report any item that may be outdated or unclear.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

8521. The density of a gas at N.T.P.is ?. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become 0.75 ? at a temperature of ____________ K?
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A. 300

B. 400

C. 373

D. 273

8522. Which of the following is a type of sedimentary rock?
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A. All of the above

B. Chemical rock

C. Clastic rock

D. Organic rock

8523. Gases having same reduced temperatures and reduced pressures_________________?
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A. Deviate from ideal gas behaviour to the same degree

B. Have nearly the same compressibility factor

C. Both A. and B.

D. Neither A. nor B.

8524. Pick out the wrong unit conversion ?
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A. 1 kcal = 3.968 BTU = 0.00116 kWh = 0.00156 hp

B. 1 ton of TNT (tri-nitro-toluene) = 4.2 GJ (1G = 109)

C. 1 ft.lbf= 0.3238 calorie = 0.1383 kg.m = 1.356 J = 1.356 N.m

D. 1 Joule = 4.186 calorie

8525. Pick out the wrong statement ?
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A. Molecules with symmetrical arrangement (e.g., CH4 and CCl4) are non-polar

B. ionise

C. Raoults law holds good for the solubility of polar gases in non-polar liquids

D. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do

E. Most of the hydrocarbons are non-polar

8526. Pick out the wrong statement ?
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A. pared to the tube

B. A reducer is used to change the direction of a pipe in a straight run

C. The method of fixing tubes to a tube sheet by expanding is called tube rolling

D. Lug supports are less expensive than other type of supports

E. A pipe is differentiated from a tube by the fact that a pipe has a greater wall thickness

8527. 1 gm mole of methane (CH4) contains_________________?
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A. 3 gms of carbon

B. 4 gm atoms of hydrogen

C. 6.02 1023 atoms of hydrogen

D. 3.01 1023 molecules of methane

8528. Atoms of the same element, but of different masses are called__________________?
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A. Isotones

B. Isobars

C. Isotopes

D. None of these

8529. Coal tar (produced by high temperature carbonization) is the main source of_________?
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A. Aromatic compounds

B. Paraffins

C. Olefins

D. Aliphatic compounds

8530. Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?
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A. Chlorine

B. Nitrogen

C. Ethane

D. All the gases will have the same KE

8531. Pick out the wrong unit conversion ?
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A. None of these

B. 1 mm Hg = 1 torr = 133.3 Pa

C. 1 kPa = 100 bar

D. 1 atm. = 760 mm Hg = 29.92 inch Hg = 14.7 psi = 1.013 bar = 1.013 kgf/cm2

8532. Pick out the wrong statement?
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A. Entropy of a system decreases with the evolution of heat

B. Surface tension of a substance vanishes at critical point, as there is no distinction between

C. The eccentric factor for all materials is always more than one

D. uid and vapour phases at its critical point

E. Change of internal energy is negative for exothermic reactions

8533. In osmosis through a semi-permeable membrane, diffusion of the___________________?
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A. Solvent is from high concentration to low concentration region

B. Solute takes place

C. None of these

D. Solvent is from low concentration to high concentration region

8534. The heat of solution depends upon the____________________?
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A. Nature of solvent

B. Nature of solute

C. All A., B. & C.

D. Concentration of solution

8535. Pick out the wrong statement ?
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A. Clausius-Clapeyron equation is not applicable to melting process

B. Combustion reactions are never endothermic in nature

C. Heat of reaction at constant volume is equal to the change in internal energy

D. Enthalpies of all elements in their standard states are assumed to be zero

8536. The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements. This is the statement of___________________?
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A. Kopps rule

B. Law of Petit and Dulong

C. Troutons rule

D. Nernst heat theorem

8537. Pick out the wrong statement?
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A. BOD is expressed in mg/litre (typically, BOD=2.5 mg/litre for potable water)

B. Biological oxygen demand (BOD) is a characteristic and not a constituent of water

C. logical decomposition of the organic matter present in water stream present as food for the

D. None of these

E. ing organism

F. BOD is a measure of the amount of oxygen which will be demanded & used in 5 days by the

8538. Pick out the wrong statement?
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A. stance in the molten state</strong>

B. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom

C. There is an increase in entropy, when a spontaneous change occurs in an isolated system

D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

E. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the

8539. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?
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A. 8/9

B. 9-Jan

C. 2-Jan

D. 9-May

8540. Pick out the wrong statement?
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A. micronic dust particles present in flue gas

B. t particles from flue gases at very high temperature</strong>

C. None of these

D. A slight haze at the top of chimney indicates good combustion in the furnace

E. Electrostatic precipitator is the most efficient dust collection equipment for removal of

F. A bag filter incurs very small pressure drop and is very efficient for removal of submicronic

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