chemical engineering MCQs – Page 409

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 Review each marked answer and report any item that may be outdated or unclear.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
8161. For a given substance at a specified temperature, activity is ______________ to fugacity?
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A. Equal

B. None of these

C. Inversely proportional

D. Directly proportional
8162. An ideal liquid refrigerant should______________________?
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A. Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils

B. Not have unduly high vapour pressure at the condenser temperature

C. Both A. and B

D. Have low specific heat

8163. Third law of thermodynamics is concerned with the__________________?
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A. None of these

B. Direction of energy transfer

C. Value of absolute entropy

D. Energy transfer

8164. Melting of wax is accompanied with ______________ in entropy?
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A. None of these

B. Increase

C. Decrease

D. No change

8165. What is the ratio of adiabatic compressibility to isothermal compressibility ?
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A. 1

B. < 1

C. > 1

D. >> 1

8166. A gas can be liquefied by pressure alone only, when its temperature is _____________ its critical temperature?
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A. Less than or equal to

B. Equal to or higher than

C. Less than

D. More than

8167. Mollier chart is a _____________ plot?
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A. Enthalpy vs. entropy

B. Pressure vs. volume

C. Pressure vs. enthalpy

D. Temperature vs. entropy

8168. The first law of thermodynamics is a statement of conservation of_____________________?
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A. Energy

B. Heat

C. Momentum

D. Work

8169. Third law of thermodynamics is helpful in___________________?
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A. Prediction of the extent of a chemical reaction

B. Calculating absolute entropies of substances at different temperature

C. Evaluating entropy changes of chemical reaction

D. Both B. and C.
8170. Compound having large heat of formation is_____________________?
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A. Either more or less stable; depends on the compound

B. Less stable

C. More stable

D. Not at all stable (like nascent O2)

8171. The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is________________?
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A. #NAME?

B. ?

C. +ve

D. 0

8172. Ideal refrigeration cycle is____________________?
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A. Dependent on the refrigerants properties

B. The least efficient of all refrigeration processes

C. Same as Carnot cycle

D. Same as reverse Carnot cycle
8173. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ? PCl3 + Cl2.Degree of dissociation of PCl5 will_________________?
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A. None of these

B. Decrease on increasing the pressure of the system

C. Increase on addition of an inert gas at constant pressure

D. Decrease on addition of Cl2

8174. Rotary lime kiln is an example of a/an _____________ system?
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A. Isolated

B. Non-thermodynamic

C. Closed

D. Open
8175. Heat is added at constant temperature in an ideal ______________ cycle?
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A. Brayton

B. Rankine

C. None of these

D. Stirling
8176. For an ideal gas, the activity co-efficient is_________________?
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A. None of these

B. Directly proportional to pressure

C. Unity at all pressures

D. Inversely proportional to pressure

8177. First law of thermodynamics deals with the ___________________?
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A. None of these

B. Irreversible processes only

C. Direction of energy transfer

D. Reversible processes only

8178. The chemical potential of any constituent of an ideal solution depends on the ______________ of the solution?
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A. All (A), B. and (C)

B. Pressure

C. Composition

D. Temperature

8179. Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?
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A. 300 (32/7)

B. 300 (35/7)

C. 300 (33/5)

D. 300 (333/7)

8180. Entropy is a measure of the _____________ of a system?
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A. None of these

B. Orderly behaviour

C. Temperature changes only

D. Disorder