chemical engineering Mcqs
8301. A system is said to be isopiestic, if there is no ______________ change?
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A. Volume

B. Temperature

C. None of these

D. Pressure
8302. The change in Gibbs free energy for vaporisation of a pure substance is___________________?
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A. Positive

B. May be positive or negative

C. Negative

D. Zero
8303. What happens in a reversible adiabatic expansion process ?
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A. Pressure is constant

B. Cooling takes place

C. Heating takes place

D. Temperature is constant

8304. If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?
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A. Be reduced to 1/4th

B. Increase four times

C. None of these

D. Increase two times
8305. Entropy change in case of reversible adiabatic process is________________?
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A. Minimum

B. Indeterminate

C. Zero

D. Maximum

8306. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?
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A. 1

B. 0.5

C. 0.25

D. 0.75

8307. The first law of thermodynamics is a restatement of the law of conservation of_________________?
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A. Mass

B. Momentum

C. None of these

D. Energy
8308. For an ideal solution, the value of activity co-efficient is______________________?
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A. 0

B. 1

C. 1
8309. The partial pressure of each constituent present in an alloy is _____________ the total vapor pressure exerted by the alloy?
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A. More than

B. Either B. or C; depends on the type of alloy

C. Less than

D. Equal to

8310. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
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A. Decreased COP

B. Same COP

C. Increased or decreased COP; depending upon the type of refrigerant

D. Increased COP
8311. At absolute zero temperature, the _____________ of the gas is zero?
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A. Volume

B. Pressure

C. Mass

D. None of these

8312. After throttling, gas temperature___________________?
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A. Increases

B. May increase or decrease; depends on the nature of the gas

C. Remain same

D. Decreases
8313. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?
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A. Cp < Cv

B. Cp > Cv

C. Cp = Cv

D. C ? Cv

8314. Mollier diagram is a plot of___________________?
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A. Temperature vs. enthalpy

B. Temperature vs. internal energy

C. Entropy vs. enthalpy

D. Temperature vs. enthalpy

8315. For a constant volume process_________________?
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A. dE = CvdT

B. dQ = dE + pdV

C. dW = pdV

D. dE = CpdT

8316. With increase in temperature, the atomic heat capacities of all solid elements_________________?
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A. Increases

B. Decreases

C. Decreases linearly

D. Remains unchanged

8317. When pressure is applied on the system, ice ? water, then_________________?
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A. More water will be formed

B. Evaporation of water will take place

C. More ice will be formed

D. Equilibrium cannot be established

8318. Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a __________________?
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A. Straight line

B. Parabola

C. Hyperbola

D. Sine curve

8319. For an ideal gas, the internal energy depends upon its ____________ only?
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A. Volume

B. Pressure

C. Molecular size

D. Temperature
8320. _______________ functions are exemplified by heat and work ?
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A. Path

B. Point

C. None of these

D. State

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

8341. Which of the following is not an equation of state ?
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A. Beattie-Bridgeman equation

B. Bertholet equation

C. Clausius-Clapeyron equation

D. None of these

8342. The number of degrees of freedom for a mixture of ice and water (liquid) are ____________________?
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A. 2

B. 1

C. 3

D. 0

8343. Internal energy of an element at 1 atm and 25 C is ____________ kcal/kg.mole?
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A. 273

B. None of these

C. 0

D. 25

8344. For a single component two phase mixture, the number of independent variable properties are_________________?
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A. Two

B. Zero

C. One

D. Three

8345. A limiting reactant is the one, which decides the ____________ in the chemical reaction?
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A. Rate constant

B. Conversion

C. None of these

D. Equilibrium constant

8346. Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is__________________?
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A. 1

B. 4

C. 3

D. 2
8347. Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance) ?
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A. Vapour compression with a reversible expansion engine

B. Air cycle

C. Ordinary vapour compression cycle

D. Carnot cycle

8348. Heating of water under atmospheric pressure is an ______________ process?
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A. Isobaric

B. Adiabatic

C. Isothermal

D. Isochoric

8349. Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?
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A. All A, B. and C

B. Solid-liquid

C. Liquid-vapor

D. Solid-vapor

8350. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is_______________?
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A. Saturated vapour

B. Superheated vapour

C. Partially condensed vapour with quality of 0.1

D. Partially condensed vapour with quality of 0.9