chemical engineering MCQs – Page 417

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 Review each marked answer and report any item that may be outdated or unclear.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
8321. If atmospheric temperature and dew point are nearly equal, then the relative humidity is_______________?
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A. Almost 100%

B. unpredictable

C. Zero

D. 50%

8322. The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?
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A. Either (A), B. or (C)

B. Does not change in volume

C. Contracts

D. Expands

8323. Fundamental principle of refrigeration is based on the ______________ law of thermodynamics?
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A. Zeroth

B. First

C. Third

D. Second
8324. Which of the following decreases with increase in pressure ?
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A. Boiling point of liquids

B. Melting point of ice

C. None of these

D. Melting point of wax

8325. For the reversible exothermic reaction, N2 + 3H2 ? 2NH3, increase of pressure would________________?
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A. Shift the equilibrium towards right

B. Give higher yield of NH3

C. Both B. and C

D. Neither A. nor B

8326. Degrees of freedom at triple point will be______________?
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A. 3

B. 1

C. 2

D. 0
8327. Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?
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A. Heat of formation

B. Heat of combustion

C. Heat of reaction

D. Calorific value

8328. High _____________ is an undesirable property for a good refrigerant?
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A. Latent heat of vaporisation

B. Specific heat

C. Specific vapor volume

D. Viscosity
8329. Any substance above its critical temperature exists as _____________________?
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A. Saturated vapour

B. Solid

C. Gas

D. Liquid

8330. Joule-Thomson co-efficient for a perfect gas is_____________________?
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A. Positive

B. Negative

C. Zero

D. None of these

8331. Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?
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A. T1/(T1 T2)

B. T2/(T1 T2)

C. (T1 T2)/T2

D. (T1 T2)/T1

8332. For an ideal gas, the chemical potential is given by______________?
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A. R d ln P

B. None of these

C. RT d ln P

D. R d ln f

8333. Heat of neutralisation of HCl and NaOH is 57.46 kJ/Kg mole. The heat of ionisation of water will be _____________ kJ/Kg mole?
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A. 57.46

B. 114.92

C. -57.46

D. -28.73

8334. 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. 3.91

D. 1.26

8335. Which is not a refrigerant ?
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A. SO2

B. C2H4Cl2

C. NH3

D. CCl2F2

8336. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?
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A. Mutual solubility of the two liquids shows a decreasing trend

B. A homogeneous solution (say of phenol water) is formed

C. Two liquids are completely separated into two layers

D. None of these

8337. Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called ____________ solutions?
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A. None of these

B. Isotonic

C. Real

D. Ideal
8338. Law of corresponding states says that___________________?
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A. The molar heat of energy of gas at constant volume should be nearly constant (about 3

B. ories)

C. Two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same

D. No gas can be liquefied above the critical temperature, howsoever high the pressure may be.

E. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at

F. critical temperature

8339. For an ideal liquid solution, which of the following is unity ?
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A. Activity

B. Fugacity co-efficient

C. Activity co-efficient

D. Fugacity

8340. What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?
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A. 2

B. 3

C. 0

D. 1