MCQOPTIONS
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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.
| 501. |
Fugacity and pressure are numerically not equal for the gases |
| A. | at low temperature and high pressure. |
| B. | at standard state. |
| C. | both (a) and (b). |
| D. | in ideal state. |
| Answer» D. in ideal state. | |
| 502. |
A change in state involving a decrease in entropy can be spontaneous, only if |
| A. | it is exothermic. |
| B. | it is isenthalpic. |
| C. | it takes place isothermally. |
| D. | it takes place at constant volume. |
| Answer» B. it is isenthalpic. | |
| 503. |
Number of phases in a colloidal system are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 504. |
Ideal refrigeration cycle is |
| A. | same as Carnot cycle. |
| B. | same as reverse Carnot cycle. |
| C. | dependent on the refrigerant's properties. |
| D. | the least efficient of all refrigeration processes. |
| Answer» C. dependent on the refrigerant's properties. | |
| 505. |
"When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change." This is called the |
| A. | Le-Chatelier principle. |
| B. | Kopp's rule. |
| C. | law of corresponding state. |
| D. | Arrehenius hypothesis. |
| Answer» B. Kopp's rule. | |
| 506. |
In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | isobaric |
| C. | polytropic |
| D. | adiabatic |
| Answer» B. isobaric | |
| 507. |
Which of the following behaves most closely like an ideal gas ? |
| A. | He |
| B. | N2 |
| C. | O2 |
| D. | H2 |
| Answer» B. N2 | |
| 508. |
An ideal monoatomic gas is taken round the cycle ABCDA as shown below in the P-V diagram The work done during the cycle is |
| A. | PV |
| B. | 2PV |
| C. | PV/2 |
| D. | 0 |
| Answer» B. 2PV | |
| 509. |
Pick out the extensive property out of the following. |
| A. | Surface tension |
| B. | Free energy |
| C. | Specific heat |
| D. | Refractive index |
| Answer» C. Specific heat | |
| 510. |
All gases above its inversion temperature, in a throttling process will show |
| A. | a heating effect. |
| B. | no change in temperature. |
| C. | a cooling effect. |
| D. | either (a) or (c). |
| Answer» B. no change in temperature. | |
| 511. |
Which of the following is not an equation of state? |
| A. | Bertholet equation |
| B. | Clausius Clayperon equation |
| C. | Beattie-Bridgeman equation |
| D. | None of these |
| Answer» C. Beattie-Bridgeman equation | |
| 512. |
Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure. |
| A. | fugacity |
| B. | partial pressure |
| C. | activity co-efficient |
| D. | (a), (b), and (c) |
| Answer» E. | |
| 513. |
An isentropic process is carried out at constant |
| A. | volume |
| B. | pressure |
| C. | temperature |
| D. | all (a), (b) and (c) |
| Answer» B. pressure | |
| 514. |
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in |
| A. | enhanced COP. |
| B. | decreased COP. |
| C. | no change in the value of COP. |
| D. | increased or decreased COP ; depending upon the type of refrigerant. |
| Answer» B. decreased COP. | |
| 515. |
Which of the following decreases with increase in pressure ? |
| A. | Melting point of ice |
| B. | Melting point of wax |
| C. | Boiling point of liquids |
| D. | none of these |
| Answer» B. Melting point of wax | |
| 516. |
The thermodynamic law, PVy = constant, is not applicable in case of |
| A. | ideal compression of air. |
| B. | free expansion of an ideal gas. |
| C. | adiabatic expansion of steam in a turbine. |
| D. | adiabatic compression of a perfect gas. |
| Answer» C. adiabatic expansion of steam in a turbine. | |
| 517. |
For the gaseous phase chemical reaction, C2H4(g) + H2O(g) C2H5OH(g), the equilibrium conversion does not depend on the |
| A. | steam to ethylene ratio. |
| B. | temperature. |
| C. | pressure. |
| D. | none of these. |
| Answer» E. | |
| 518. |
Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of |
| A. | sublimation |
| B. | fusion |
| C. | transition |
| D. | vaporisation |
| Answer» D. vaporisation | |
| 519. |
Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)? |
| A. | Freon |
| B. | Liquid sulphur dioxide |
| C. | Methyl chloride |
| D. | Ammonia |
| Answer» B. Liquid sulphur dioxide | |
| 520. |
Forward reaction will be favoured for the exothermic reaction, represented by CO + H2O CO2 + H2, by |
| A. | low temperature and high pressure. |
| B. | low temperature and low pressure. |
| C. | high temperature and high pressure. |
| D. | high temperature and low pressure. |
| Answer» B. low temperature and low pressure. | |
| 521. |
Which of the following is not an extensive property ? |
| A. | Free energy |
| B. | Entropy |
| C. | Refractive index |
| D. | None of these |
| Answer» D. None of these | |
| 522. |
Enthalpy changes over a constant pressure path are always zero for __________ gas. |
| A. | any |
| B. | a perfect |
| C. | an easily liquefiable |
| D. | a real |
| Answer» C. an easily liquefiable | |
| 523. |
For an ideal solution, the value of activity co-efficient is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 524. |
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | increase in summer and will decrease in winter |
| Answer» B. decrease | |
| 525. |
The value of gas constant 'R' is |
| A. | 1.987 cal/gm mole °K |
| B. | 1.987 BTU/lb. mole °R |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 526. |
The kinetic energy of gas molecule is zero at |
| A. | 0°C |
| B. | 273°C |
| C. | 100°C |
| D. | -273°C |
| Answer» E. | |
| 527. |
The expression, , is for the____of an ideal gas. |
| A. | compressibility |
| B. | work done under adiabatic contition |
| C. | work done under isothermal condition |
| D. | co-efficient of thermal expansion |
| Answer» D. co-efficient of thermal expansion | |
| 528. |
"The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances". This is the |
| A. | Lewis-Randall rule. |
| B. | statement of Vant-Hoff equation. |
| C. | Le-Chatelier's principle. |
| D. | none of these. |
| Answer» E. | |
| 529. |
__________ does not change during phase transformation processes like sublimation, melting & vaporisation. |
| A. | Entropy |
| B. | Gibbs free energy |
| C. | Internal energy |
| D. | all (a), (b) & (c) |
| Answer» C. Internal energy | |
| 530. |
Heat is added at constant temperature in an ideal __________ cycle. |
| A. | Stirling |
| B. | Brayton |
| C. | Rankine |
| D. | none of these |
| Answer» B. Brayton | |
| 531. |
With increase in temperature, the internal energy of a substance |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | may increase or decrease; depends on the substance |
| Answer» B. decreases | |
| 532. |
Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are |
| A. | always greater than one. |
| B. | same at the same reduced temperature. |
| C. | same at the same reduced pressure. |
| D. | both(b) & (c). |
| Answer» E. | |
| 533. |
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. |
| A. | isobaric |
| B. | isothermal |
| C. | adiabatic |
| D. | none of these |
| Answer» C. adiabatic | |
| 534. |
The free energy change for a chemical reaction is given by (where, K = equilibrium constant) |
| A. | RT lnK |
| B. | #NAME? |
| C. | -R lnK |
| D. | T lnK |
| Answer» C. -R lnK | |
| 535. |
At absolute zero temperature, the __________ of the gas is zero. |
| A. | pressure |
| B. | volume |
| C. | mass |
| D. | none of these |
| Answer» C. mass | |
| 536. |
For a given substance at a specified temperature, activity is __________ to fugacity. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | equal |
| D. | none of these |
| Answer» B. inversely proportional | |
| 537. |
Which of the following is not a common refrigerant ? |
| A. | Freon-12 |
| B. | Ethylene |
| C. | Ammonia |
| D. | Carbon dioxide |
| Answer» C. Ammonia | |
| 538. |
For a real gas, the chemical potential is given by |
| A. | RT dlnP |
| B. | RT dlnf |
| C. | R dlnf |
| D. | none of these |
| Answer» C. R dlnf | |
| 539. |
A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid. |
| A. | subcooled |
| B. | saturated |
| C. | non-solidifiable |
| D. | none of these |
| Answer» B. saturated | |
| 540. |
What is the degree of freedom for two mis-cible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 541. |
The four properties of a system viz. P, V, T, S are related by __________ equation. |
| A. | Gibbs-Duhem |
| B. | Gibbs-Helmholtz |
| C. | Maxwell's |
| D. | none of these |
| Answer» D. none of these | |
| 542. |
The intensive properties are |
| A. | molar volume, density, viscosity and boiling point. |
| B. | refractive index and surface tension. |
| C. | both (a) and (b). |
| D. | none of these. |
| Answer» D. none of these. | |
| 543. |
The expression, nCv(T2 - T1), is for the __________ of an ideal gas. |
| A. | work done under adiabatic condition |
| B. | co-efficient of thermal expansion |
| C. | compressibility |
| D. | none of these |
| Answer» B. co-efficient of thermal expansion | |
| 544. |
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation. |
| A. | Gibbs-Duhem |
| B. | Van Laar |
| C. | Gibbs-Helmholtz |
| D. | Margules |
| Answer» B. Van Laar | |
| 545. |
Heat of reaction is |
| A. | dependent on pressure only. |
| B. | dependent on temperature only. |
| C. | dependent on both pressure and temperature. |
| D. | independent of temperature changes. |
| Answer» D. independent of temperature changes. | |
| 546. |
Claussius-Clayperon equation gives accurate result, when the |
| A. | vapour pressure is relatively low and the temperature does not vary over wide limits. |
| B. | vapour obeys the ideal gas law and the latent heat of vaporisation is constant. |
| C. | volume in the liquid state is negligible compared with that in the vapour state. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 547. |
Which of the following is Virial equation of state? |
| A. | (p + a/V2)(V - b) = nRT |
| B. | PV = nRT |
| C. | PV = A + B/V + C/V2 + D/V3 + ... |
| Answer» D. | |
| 548. |
A domestic refrigerator has a/an __________ cooled condenser. |
| A. | water |
| B. | air |
| C. | evaporative |
| D. | gas |
| Answer» C. evaporative | |
| 549. |
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C 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$ |
| A. | -1.87 |
| B. | 0 |
| C. | 1.26 |
| D. | 3.91 |
| Answer» C. 1.26 | |
| 550. |
If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will |
| A. | increase |
| B. | decrease |
| C. | remain unaltered |
| D. | increase or decrease ; depends on the particular reaction |
| Answer» D. increase or decrease ; depends on the particular reaction | |