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MCQOPTIONS
This section includes 838 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will |
| A. | decrease on addition of Cl2. |
| B. | increase on addition of an inert gas at constant pressure. |
| C. | decrease on increasing the pressure of the system. |
| D. | none of these |
| Answer» E. | |
| 752. |
For organic compounds, group contribution method can be used for the estimation of |
| A. | critical properties. |
| B. | specific gravity. |
| C. | specific volume. |
| D. | thermal conductivity. |
| Answer» B. specific gravity. | |
| 753. |
__________ equation predicts the activity co-efficient from experimental data. |
| A. | Lewis-Randall |
| B. | Margules |
| C. | Van Laar |
| D. | both(b)&(c) |
| Answer» E. | |
| 754. |
For a single component two phase mixture, the number of independent variable properties are |
| A. | two |
| B. | one |
| C. | zero |
| D. | three |
| Answer» C. zero | |
| 755. |
If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero. |
| A. | enthalpy |
| B. | volume |
| C. | both 'a' & 'b' |
| D. | neither 'a' nor 'b' |
| Answer» D. neither 'a' nor 'b' | |
| 756. |
Free energy change at equilibrium is |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | indeterminate |
| Answer» B. positive | |
| 757. |
Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the |
| A. | calorific value |
| B. | heat of reaction |
| C. | heat of combustion |
| D. | heat of formation |
| Answer» D. heat of formation | |
| 758. |
In a homogeneous solution, the fugacity of a component depends upon the |
| A. | pressure |
| B. | composition |
| C. | temperature |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 759. |
In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respetively, the Carnot COP will be |
| A. | 5.2 |
| B. | 6.2 |
| C. | 0.168 |
| D. | data insufficient, can't be found out |
| Answer» B. 6.2 | |
| 760. |
In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | adiabatic |
| C. | isentropic |
| D. | polytropic |
| Answer» D. polytropic | |
| 761. |
Boyle's law for gases states that |
| A. | , when temperature is constant. |
| B. | , when temperature & mass of the gas remain constant. |
| C. | P ‚àù V, at constant temperature & mass of the gas. |
| D. | = constant, for any gas. |
| Answer» C. P ‚àù V, at constant temperature & mass of the gas. | |
| 762. |
Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as |
| A. | P + F - C = 2 |
| B. | C = P - F + 2 |
| C. | F = C - P - 2 |
| D. | P = F - C - 2 |
| Answer» B. C = P - F + 2 | |
| 763. |
Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which |
| A. | a homogeneous solution (say of phenol water) is formed. |
| B. | mutual solubility of the two liquids shows a decreasing trend. |
| C. | two liquids are completely separated into two layers. |
| D. | none of these. |
| Answer» B. mutual solubility of the two liquids shows a decreasing trend. | |
| 764. |
When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is |
| A. | more in vapour phase. |
| B. | more in liquid phase. |
| C. | same in both the phases. |
| D. | replaced by chemical potential which is more in vapour phase. |
| Answer» D. replaced by chemical potential which is more in vapour phase. | |
| 765. |
For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases. |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | decreases linearly |
| Answer» C. remains same | |
| 766. |
During Joule-Thomson expansion of gases |
| A. | enthalpy remains constant. |
| B. | entropy remains constant. |
| C. | temperature remains constant. |
| D. | none of these. |
| Answer» B. entropy remains constant. | |
| 767. |
Entropy change for an irreversible isolated system is |
| A. | ‚àû |
| B. | 0 |
| C. | < 0 |
| D. | > 0 |
| Answer» E. | |
| 768. |
A gas performs the maximum work, when it expands |
| A. | non-uniformly |
| B. | adiabatically |
| C. | isobarically |
| D. | isothermally |
| Answer» D. isothermally | |
| 769. |
Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 770. |
Pick out the correct statement: |
| A. | In an isothermal system, irreversible work is more than reversible work. |
| B. | Under reversible conditions, the adiabatic work is less than isothermal work. |
| C. | Heat, work, enthalpy and entropy are all 'state functions'. |
| D. | Matter and energy can not be exchanged with the surroundings in a closed system. |
| Answer» C. Heat, work, enthalpy and entropy are all 'state functions'. | |
| 771. |
For an irreversible process involving only pressure-volume work |
| A. | (dF)T, p <0 |
| B. | (dF)T, p = 0 |
| C. | (dF)T, p > 0 |
| D. | (dA)T, v >0 |
| Answer» B. (dF)T, p = 0 | |
| 772. |
Refrigerants commonly used for domestic refrigerators are |
| A. | ethyl chloride or methyle chloride |
| B. | freon-12 |
| C. | propane |
| D. | NH3 or CO2. |
| Answer» B. freon-12 | |
| 773. |
A refrigerator may be termed as a |
| A. | heat pump |
| B. | heat engine |
| C. | Carnot engine |
| D. | none of these |
| Answer» B. heat engine | |
| 774. |
Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. |
| A. | below |
| B. | at |
| C. | above |
| D. | either 'b' or 'c' |
| Answer» B. at | |
| 775. |
Melting of ice exemplifies a/an |
| A. | adiabatic process. |
| B. | endothermic reaction. |
| C. | exothermic reaction. |
| D. | process involving a chemical reaction. |
| Answer» C. exothermic reaction. | |
| 776. |
When a gas in a vessel expands, its internal energy decreases. The process involved is |
| A. | reversible |
| B. | irreversible |
| C. | isothermal |
| D. | adiabatic |
| Answer» B. irreversible | |
| 777. |
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except |
| A. | CO2 |
| B. | H2 |
| C. | O2 |
| D. | N2 |
| Answer» C. O2 | |
| 778. |
Melting of wax is accompanied with __________ in entropy. |
| A. | increase |
| B. | decrease |
| C. | no change |
| D. | none of these |
| Answer» B. decrease | |
| 779. |
Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates |
| A. | use of only one graph for all gases. |
| B. | covering of wide range. |
| C. | easier plotting. |
| D. | more accurate plotting. |
| Answer» B. covering of wide range. | |
| 780. |
Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour. |
| A. | superheated |
| B. | desuperheated |
| C. | non-condensable |
| D. | none of these |
| Answer» B. desuperheated | |
| 781. |
In a working refrigerator, the value of COP is always |
| A. | 0 |
| B. | < 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 782. |
To obtain integrated form of Clausius-Clayperon equation, , from the exact Clayperon equafion, it is assumed that the |
| A. | volume of the liquid phase is negligible compared to that of vapour phase. |
| B. | vapour phase behaves as an ideal gas. |
| C. | heat of vaporisation is independent of temperature. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 783. |
The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of sustance added for an infinitesimal addition at constant temperature and pressure. It is given by |
| A. | |
| B. | |
| C. | |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 784. |
The unit of fugacity is the same as that of the |
| A. | pressure |
| B. | temperature |
| C. | volume |
| D. | molar concentration |
| Answer» B. temperature | |
| 785. |
Charles' law for gases states that |
| A. | = Constant |
| B. | |
| C. | |
| D. | = Constant |
| Answer» B. | |
| 786. |
Throttling process is a/an __________ process. |
| A. | reversible and isothermal |
| B. | irreversible and constant enthalpy |
| C. | reversible and constant entropy |
| D. | reversible and constant enthalpy |
| Answer» C. reversible and constant entropy | |
| 787. |
The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing. |
| A. | contracts |
| B. | expands |
| C. | does not change in volume |
| D. | either (a), (b) or (c) |
| Answer» B. expands | |
| 788. |
Entropy change in case of reversible adiabatic process is |
| A. | minimum |
| B. | zero |
| C. | maximum |
| D. | indeterminate |
| Answer» C. maximum | |
| 789. |
The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in |
| A. | an open system of constant composition. |
| B. | a closed system of constant composition. |
| C. | an open system with changes in composition. |
| D. | a closed system with changes in composition. |
| Answer» E. | |
| 790. |
Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics. |
| A. | 1st |
| B. | zeroth |
| C. | 3rd |
| D. | none of these |
| Answer» C. 3rd | |
| 791. |
Pick out the Claussius-Clayperon equation from the following: |
| A. | |
| B. | |
| C. | |
| D. | none of these |
| Answer» C. | |
| 792. |
Which of the following will increase the volume of a real gas by four times ? |
| A. | Doubling the absolute temperature as well as pressure of the gas. |
| B. | Reducing pressure to one fourth at constant temperature. |
| C. | Reducing temperature to one fourth at constant pressure. |
| D. | Reducing the temperature to half and doubling the pressure. |
| Answer» C. Reducing temperature to one fourth at constant pressure. | |
| 793. |
Heat pump |
| A. | accomplishes only space heating in winter. |
| B. | accomplishes only space cooling in summer. |
| C. | accomplishes both (a) and (b). |
| D. | works on Carnot cycle. |
| Answer» D. works on Carnot cycle. | |
| 794. |
Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas ) |
| A. | T |
| B. | T |
| C. | T2 |
| D. | 1/T |
| Answer» B. T | |
| 795. |
The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise. |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | decreases linearly |
| Answer» B. decreases | |
| 796. |
Fugacity and pressure are numerically equal, when the gas is |
| A. | in standard state |
| B. | at high pressure |
| C. | at low temperature |
| D. | in ideal state |
| Answer» E. | |
| 797. |
For a cyclic process, a fixed ratio between heat and work |
| A. | always exists |
| B. | may exist |
| C. | never exists |
| D. | is difficult to predict |
| Answer» B. may exist | |
| 798. |
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. |
| A. | Bomb |
| B. | Separating |
| C. | Bucket |
| D. | Throttling |
| Answer» B. Separating | |
| 799. |
Which of the following liquid metals has the highest thermal conductivity ? |
| A. | Molten sodium |
| B. | Molten lead |
| C. | Mercury |
| D. | Molten potassium |
| Answer» B. Molten lead | |
| 800. |
In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent. |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» C. 0.75 | |