chemical engineering MCQs – Page 432

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 Review each marked answer and report any item that may be outdated or unclear.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

8621. The latent heat of vaporisation__________________?
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A. Becomes zero at the critical point

B. All A., B. & C.

C. Decreases with increased temperature

D. Decreases as pressure increases

8622. Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?
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A. Temperature

B. Nature of solute

C. Nature of solvent

D. Pressure

8623. The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be_______________?
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A. 18.18%

B. 20%

C. 10%

D. 5%

8624. Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ?
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A. P + (a/V2)

B. 1/RT

C. RT

D. (V b)

8625. Pick out the wrong statement ?
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A. ogenic method

B. per-Totzek process of coal gasification

C. Percentage of ash in coke produced from medium coking coal is more than that in coal

D. Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ

E. The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it by

F. Ash is normally removed as fly-ash in Kopper-Totzek process of coal gasification

8626. Pick out the wrong unit conversion ?
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A. 1 Pascal second = 10 poise

B. 1 stoke = 1 m2/second

C. 1 ppm = 1 ml/m3 = 1 mg/kg

D. 1 kgf= 9.8 Newton

8627. Pick out the wrong statement ?
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A. Mesosphere is characterised by very low atmospheric pressure and low temperature

B. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in

C. atosphere</strong>

D. ne

E. Troposphere is a dusty zone containing water vapor and clouds

F. The radio waves used in the long distance radio communication are reflected back to earth by

8628. Number of gm moles of solute dissolved in 1 kg of solvent is called its___________________?
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A. Molality

B. Molarity

C. Normality

D. Formality

8629. Pick out the wrong statement ?
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A. pared to the two stroke engines

B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as

C. Temperature in stratosphere rises with increasing altitude

D. mical oxygen demand (C.O.D.) value

E. iation to come in but does not allow the short wavelength infra red radiation to escape out

F. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its

8630. Maximum heat transfer rate can be expected in case of_________?
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A. Turbulent flow

B. Laminar flow

C. Heat flow rate is independent of nature of flow

D. Co-current flow

8631. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?
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A. 8

B. 12

C. 10

D. 6

8632. Solutions which distil without change in composition are called________________?
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A. Azeotropic

B. Saturated

C. Ideal

D. Supersaturated

8633. Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?
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A. Standard integral heat of solution

B. Heat of mixing

C. Heat of hydration

D. Heat of solvation

8634. 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?
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A. 10

B. 1000

C. 1

D. 0.1

8635. A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be _____________ kgf/cm2 ?
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A. 8

B. 1

C. 2

D. 4

8636. The temperature at which the second Virial co-efficient of a real gas is zero is called the_____________________?
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A. Boyle temperature

B. Critical temperature

C. Boiling point

D. Eutectic point

8637. Hesss law of constant heat summation is based on conservation of mass. It deals with ___________________?
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A. Reaction rate

B. Changes in heat of reaction

C. None of these

D. Equilibrium constant

8638. Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?
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A. Thiosulphate

B. Bisulphite

C. Chloride

D. Carbonate (monohydrate)

8639. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0C will be _______________ atmosphere?
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A. 0.5

B. 2

C. 1.5

D. 1

8640. Total energy at a point comprises of _____________ energy?
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A. Potential & kinetic

B. All A., B. & C.

C. Pressure

D. Internal

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