chemical engineering Mcqs
8151. Throttling process is a/an _____________ process?
comments icon0

A. Reversible and constant enthalpy

B. Reversible and constant entropy

C. Irreversible and constant enthalpy

D. Reversible and isothermal

8152. Which of the following is not a common refrigerant ?
comments icon0
A. Ethylene

B. Ammonia

C. Freon-12

D. Carbon dioxide

8153. Normal temperature and pressure (N.T.P.) corresponds to ___________________?
comments icon0

A. 15C and 760 mm Hg

B. 0C and 760 mm Hg

C. 20C and 760 mm Hg

D. 0C and 1 kgf/cm2

8154. Henrys law is closely obeyed by a gas, when its _____________ is extremely high?
comments icon0

A. Pressure

B. Temperature

C. Solubility

D. None of these
8155. The internal energy of an incompressible fluid depends upon its_________________?
comments icon0

A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

8156. In case of a close thermodynamic system, there is ______________ across the boundaries?
comments icon0

A. None of these

B. No mass transfer but heat transfer

C. Mass and energy transfer

D. No heat and mass transfer

8157. Melting of ice is an example of an _____________ process?
comments icon0

A. None of these

B. Isometric

C. Adiabatic

D. Isothermal
8158. An irreversible process____________________?
comments icon0

A. Yields the maximum amount of work

B. Is an idealised visualisation of behaviour of a system

C. Yields an amount of work less than that of a reversible process

D. Is the analog of linear frictionless motion in machines

8159. The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann?s constant, T = absolute temperature) ?
comments icon0

A. ?(6KT/m)

B. 3KT/m

C. ?(3KT/m)

D. ?(2KT/m)

8160. The kinetic energy of gas molecule is zero at_____________________?
comments icon0

A. 0C

B. 100C

C. 273C

D. -273C
8161. For a given substance at a specified temperature, activity is ______________ to fugacity?
comments icon0

A. Equal

B. None of these

C. Inversely proportional

D. Directly proportional
8162. An ideal liquid refrigerant should______________________?
comments icon0

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__________________?
comments icon0

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?
comments icon0

A. None of these

B. Increase

C. Decrease

D. No change

8165. What is the ratio of adiabatic compressibility to isothermal compressibility ?
comments icon0

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?
comments icon0
A. Less than or equal to

B. Equal to or higher than

C. Less than

D. More than

8167. Mollier chart is a _____________ plot?
comments icon0
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_____________________?
comments icon0
A. Energy

B. Heat

C. Momentum

D. Work

8169. Third law of thermodynamics is helpful in___________________?
comments icon0

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_____________________?
comments icon0

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________________?
comments icon0

A. #NAME?

B. ?

C. +ve

D. 0

8172. Ideal refrigeration cycle is____________________?
comments icon0

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_________________?
comments icon0
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?
comments icon0

A. Isolated

B. Non-thermodynamic

C. Closed

D. Open
8175. Heat is added at constant temperature in an ideal ______________ cycle?
comments icon0

A. Brayton

B. Rankine

C. None of these

D. Stirling
8176. For an ideal gas, the activity co-efficient is_________________?
comments icon0

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 ___________________?
comments icon0

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?
comments icon0
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___________________?
comments icon0
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?
comments icon0

A. None of these

B. Orderly behaviour

C. Temperature changes only

D. Disorder
8181. Which of the following equations is used for the prediction of activity co-efficient from experiments ?
comments icon0

A. Margules equation

B. All A, B. and C

C. Van Laar equation

D. Wilsons equation

8182. To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (?HV/R) (1/T1 1/T2) from the exact Clapeyron equation, it is assumed that the____________________?
comments icon0

A. Volume of the liquid phase is negligible compared to that of vapour phase

B. Heat of vaporisation is independent of temperature

C. All A , B. & C.

D. Vapour phase behaves as an ideal gas

8183. The variation of heat of reaction with temperature at constant pressure is given by the ____________ law?
comments icon0
A. Kirchoffs

B. Antoines

C. Kelvins

D. None of these

8184. A system is said to be at equilibrium, if the entropy of the system has reached ____________ value?
comments icon0

A. Zero

B. None of these

C. Maximum

D. Minimum

8185. The adiabatic throttling process of a perfect gas is one of constant enthalpy_________________?
comments icon0
A. Which can be performed in a pipe with a constriction

B. Which is exemplified by a non-steady flow expansion

C. In which there is an increase in temperature

D. In which there is a temperature drop

8186. For a reversible process involving only pressure-volume work____________________?
comments icon0
A. (dF)T, p = 0

B. (dA)T, v < 0

C. (dF)T, p 0

8187. Water on heating from 1 to 4C___________________?
comments icon0

A. Expands

B. Contracts

C. Has same volume

D. May contract or expand

8188. Heat of formation of an element in its standard state is___________________?
comments icon0

A. 0

B. A function of pressure

C. 0
8189. In an ideal solution, the activity of a component equals its __________________?
comments icon0

A. Partial pressure

B. Mole fraction

C. None of these

D. Fugacity at the same temperature and pressure

8190. Van Laar equation deals with the activity co-efficients in___________________?
comments icon0
A. Binary solutions

B. None of these

C. Azeotropic mixture only

D. Ternary solutions

8191. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (?P/?V)s and the slope of the reversible isothermal line (?P/?V)T are related as (where, y = Cp/Cv) ?
comments icon0

A. (?P/?V)S = [(?P/?V)T]Y

B. (?P/?V)S = y(?P/?V)T

C. (?P/?V)S = (?P/?V)T

D. (?P/?V)S = 1/y(?P/?V)T

8192. Entropy change for an irreversible process taking system and surrounding together is___________________?
comments icon0

A. None of these

B. < 0

C. > 0

D. 0

8193. At ____________ point, all the three phases (i.e. solid, liquid and gas) co-exist ?
comments icon0
A. Triple

B. Plait

C. Eutectic

D. Critical

8194. Internal energy change of a system over one complete cycle in a cyclic process is__________________?
comments icon0

A. #NAME?

B. Zero

C. #NAME?

D. Dependent on the path

8195. The expression, nRT ln(P1/P2), is for the _____________of an ideal gas?
comments icon0
A. Work done under isothermal condition

B. Compressibility

C. Work done under adiabatic condition

D. Co-efficient of thermal expansion

8196. Pick out the correct equation relating F and A___________________?
comments icon0

A. F = A + TS

B. F = A + PV

C. F = A TS

D. F = E + A

8197. Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the ____________ equation?
comments icon0
A. Clapeyron

B. None of these

C. Maxwells

D. Gibbs-Duhem

8198. The equation, PV = nRT, is best obeyed by gases at____________________?
comments icon0
A. Low pressure & high temperature

B. None of these

C. High pressure & low temperature

D. Low pressure & low temperature

8199. For equilibrium process (i.e. reversible) in an isolated system __________________?
comments icon0

A. ds = Constant

B. ds = 0

C. ds 0

8200. In the decomposition of PCl5 represented by, PCl5 ? PCl3 + Cl2, decrease in the pressure of the system will _____________ the degree of dissociation of PCl5?
comments icon0

A. None of these

B. Increase

C. Not alter

D. Decrease