chemical engineering Mcqs
8201. Reduced pressure of a gas is the ratio of its__________________?
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A. Critical pressure to pressure

B. Pseudocritical pressure to pressure

C. Pressure to pseudocritical pressure

D. Pressure to critical pressure
8202. A gas performs the maximum work, when it expands___________________?
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A. Isothermally

B. Isobarically

C. Adiabatically

D. Non-uniformly

8203. If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in____________________?
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A. Volume

B. Enthalpy

C. Both A. & B

D. Neither A. nor B

8204. An isolated system can exchange ______________ with its surroundings?
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A. Matter

B. Energy

C. Neither matter nor energy

D. Both matter and energy

8205. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the __________________?
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A. Maxwells relations

B. Third law of thermodynamics

C. Second law of thermodynamics

D. Nernst heat theorem

8206. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of _____________ and COP are the same?
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A. None of these

B. Kinematic viscosity

C. Work

D. Temperature

8207. For a cyclic process, a fixed ratio between heat and work___________________?
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A. Always exists

B. May exist

C. Never exists

D. Is difficult to predict

8208. For an isothermal reversible compression of an ideal gas_______________?
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A. dQ = dE

B. ?E = ?H = 0

C. Only ?E = 0

D. Only ?H =0

8209. Sublimation temperature of dry ice (solid CO2) is ____________ C?
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A. -78

B. 5

C. -273

D. 0

8210. Gibbs free energy (F) is defined as__________________?
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A. F = E TS

B. F = H + TS

C. F = H TS

D. F = E + TS

8211. In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible ______________ process?
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A. Adiabatic

B. Isentropic

C. Polytropic

D. Isothermal

8212. Gibbs phase rule finds application, when heat transfer occurs by___________________?
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A. Condensation

B. Radiation

C. Convection

D. Conduction

8213. Gibbs free energy of mixing at constant pressure and temperature is always__________________?
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A. 0

B. ?

C. ve

D. #NAME?

8214. Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O ? CO2 + H2, by_________________?
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A. Low temperature and high pressure

B. High temperature and low pressure

C. Low temperature and low pressure

D. High temperature and high pressure

8215. Specific volume of an ideal gas is____________________?
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A. None of these

B. Equal to its density

C. Proportional to pressure

D. The reciprocal of its density
8216. The unit of fugacity is the same as that of the_________________?
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A. Pressure

B. Molar concentration

C. Volume

D. Temperature

8217. The equation, Cp Cv = R, is true for _______________ gas?
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A. No

B. Any real

C. Only ideal

D. Both B. and C.

8218. Helmholtz free energy A. is defined as____________________?
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A. A = H + TS

B. A = E TS

C. None of these

D. A = H TS

8219. Measurement of thermodynamic property of temperature is facilitated by ____________ law of thermodynamics?
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A. None of these

B. 3rd

C. 1st

D. Zeroth
8220. Clapeyron Equation deals with the____________________?
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A. Temperature dependence of heat of phase transition

B. Effect of an inert gas on vapour pressure

C. Rate of change of vapour pressure with temperature

D. Calculation of ?F for spontaneous phase change

8221. The second law of thermodynamics states that___________________?
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A. None of the above

B. The energy change of a system undergoing any reversible process is zero

C. The total energy of system and surrounding remains the same

D. It is not possible to transfer heat from a lower temperature to a higher temperature

8222. Enthalpy changes over a constant pressure path are always zero for ______________ gas?
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A. Any

B. An easily liquefiable

C. A real

D. A perfect
8223. Which of the following non-flow reversible compression processes require maximum work ?
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A. Isobaric process

B. Adiabatic process

C. All require same work

D. Isothermal process

8224. Fugacity is a measure of the____________________?
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A. None of these

B. Escaping tendencies of the same substance in different phases of a system

C. Relative volatility of a mixture of two miscible liquids

D. Behaviour of ideal gases

8225. All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure?
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A. Nitrogen

B. Oxygen

C. Hydrogen

D. Air

8226. Absolute zero temperature signifies the ____________________?
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A. Minimum temperature attainable

B. None of these

C. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in

D. Temperature of the heat reservoir to which a Carnot engine rejects no heat
8227. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is__________________?
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A. 0

B. > 0

C. < 0

D. None of these

8228. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ______________ calorimeter is not used for measuring the dryness fraction of steam?
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A. Throttling

B. Bomb

C. Separating

D. Bucket

8229. Which law of the thermodynamics provides basis for measuring the thermodynamic property ?
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A. Third law

B. Second law

C. First law

D. Zeroth law
8230. For an ideal gas, the enthalpy__________________?
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A. Is independent of pressure

B. Decreases with rise in pressure

C. Is a path function

D. Increases with rise in pressure

8231. The standard Gibbs free energy change of a reaction depends on the equilibrium______________________?
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A. All A, B. and C

B. Temperature

C. Composition

D. Pressure

8232. In case of an _______________ process, the temperature of the system increases?
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A. Isothermal expansion

B. Adiabatic expansion

C. Isothermal compression

D. Adiabatic compression
8233. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is__________________?
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A. -RT ln 0.5

B. 0.5 RT

C. -2 RT ln 0.5

D. 2 RT

8234. Pick out the wrong statement. A. The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction________________?
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A. rease in volume accompanying the reaction

B. The conversion for a gas phase reaction increases with increase in pressure, if there is a

C. The equilibrium constant of a reaction depends upon temperature only

D. With increase in temperature, the equilibrium constant increases for an exothermic reaction
8235. Solid and liquid phases of a substance are in equilibrium at the____________________?
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A. Critical temperature

B. Melting point

C. Freezing point

D. Both B. and C
8236. Charles law for gases states that__________________?
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A. V ? 1/P

B. PV/T = Constant

C. V/T = Constant

D. V ? 1/T

8237. During adiabatic expansion of gas___________________?
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A. Pressure is increased

B. Pressure remains constant

C. None of these

D. Temperature remains constant

8238. Which of the following will increase the volume of a real gas by four times ?
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A. Reducing the temperature to half and doubling the pressure

B. Reducing temperature to one fourth at constant pressure

C. Reducing pressure to one fourth at constant temperature

D. Doubling the absolute temperature as well as pressure of the gas

8239. Work done in an adiabatic process between two states depends on the__________________?
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A. None of these

B. Rate of heat transmission

C. End states only

D. Initial state only

8240. During Joule-Thomson expansion of gases_________________?
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A. Entropy remains constant

B. None of these

C. Enthalpy remains constant

D. Temperature remains constant

8241. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the__________________?
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A. Two temperatures only

B. Pressure of working fluid

C. Mass of the working fluid

D. Mass and pressure both of the working fluid

8242. During a reversible isothermal expansion of an ideal gas, the entropy change is___________________?
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A. +ve

B. ?

C. #NAME?

D. 0

8243. The ammonia synthesis reaction represented by N2 + 3H2 ? 2NH3; ?H = 22.4 kcal, is__________________?
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A. Isothermal

B. Endothermic

C. Adiabatic

D. Exothermic
8244. In the equation, PVn = constant, if the value of n = ?, then it represents a reversible _____________ process?
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A. Adiabatic

B. Isothermal

C. Isentropic

D. Isometric
8245. Melting of ice exemplifies a/an______________________?
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A. Exothermic reaction

B. Adiabatic process

C. Endothermic reaction

D. Process involving a chemical reaction

8246. With increase in compression ratio, the efficiency of the otto engine________________?
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A. Increases linearly

B. Remain constant

C. Decreases

D. Increases
8247. While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is _______________?
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A. Unity

B. Infinity

C. Constant

D. Negative

8248. Isobaric process means a constant process ?
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A. Entropy

B. Pressure

C. Volume

D. Temperature

8249. Pick out the wrong statement_________________?
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A. Phase rule variables are intensive properties

B. Heat and work are both state function

C. The work done by expansion of a gas in vacuum is zero

D. CP and CV are state function

8250. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?
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A. Isobaric

B. Isothermal

C. Adiabatic

D. None of these