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.
| 601. |
Cv for an ideal gas |
| A. | does not depend upon temperature. |
| B. | is independent of pressure only. |
| C. | is independent of volume only. |
| D. | is independent of both pressure and volume. |
| Answer» E. | |
| 602. |
If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the |
| A. | process must be isobaric. |
| B. | temperature must decrease. |
| C. | process must be adiabatic. |
| D. | both (b) and (c). |
| Answer» E. | |
| 603. |
Enthalpy 'H' is defined as |
| A. | H = E - PV |
| B. | H = F - TS |
| C. | H - E = PV |
| D. | none of these |
| Answer» D. none of these | |
| 604. |
At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.$ |
| A. | 72 |
| B. | 92 |
| C. | 142 |
| D. | 192 |
| Answer» C. 142 | |
| 605. |
Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)$ |
| A. | (atm)Δx, when Δx is negative |
| B. | (atm)Δx, when Δx is positive |
| C. | Dimensionless, when Δx = 0 |
| D. | (atm)Δx2, when Δx > 0 |
| Answer» E. | |
| 606. |
For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is |
| A. | x |
| B. | x + 1 |
| C. | x + 2 |
| D. | x + 3 |
| Answer» D. x + 3 | |
| 607. |
In Joule-Thomson porous plug experiment, the |
| A. | enthalpy does not remain constant. |
| B. | entire apparatus is exposed to surroundings. |
| C. | temperature remains constant. |
| D. | none of these. |
| Answer» E. | |
| 608. |
For equilibrium process (i.e. reversible) in an isolated system |
| A. | ds = 0 |
| B. | ds < 0 |
| C. | ds > 0 |
| D. | ds = Constant |
| Answer» B. ds < 0 | |
| 609. |
The extensive properties are |
| A. | volume, mass and number of moles. |
| B. | free energy, entropy and enthalpy. |
| C. | both (a) and (b). |
| D. | none of these. |
| Answer» D. none of these. | |
| 610. |
What happens in a reversible adiabatic compression ? |
| A. | Heating occurs |
| B. | Cooling occurs |
| C. | Pressure is constant |
| D. | Temperature is constant |
| Answer» B. Cooling occurs | |
| 611. |
Heat of formation of an element in its standard state is |
| A. | 0 |
| B. | < 0 |
| C. | > 0 |
| D. | a function of pressure |
| Answer» B. < 0 | |
| 612. |
Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be |
| A. | 580 |
| B. | 640 |
| C. | 1160 |
| D. | data insufficient; can't be computed |
| Answer» D. data insufficient; can't be computed | |
| 613. |
The ammonia synthesis reaction represented by N2 + 3H2 2NH3 ; ΔH = - 22.4 kcal, is$ |
| A. | endothermic |
| B. | exothermic |
| C. | isothermal |
| D. | adiabatic |
| Answer» C. isothermal | |
| 614. |
The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be |
| A. | more |
| B. | less |
| C. | same |
| D. | data insufficient to predict |
| Answer» B. less | |
| 615. |
As the time is passing, entropy of the universe |
| A. | is increasing |
| B. | is decreasing |
| C. | remains constant |
| D. | data insufficient, can't be predicted |
| Answer» B. is decreasing | |
| 616. |
For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be$ |
| A. | 6738.9 |
| B. | 6753.5 |
| C. | 7058.3 |
| D. | 9000 |
| Answer» C. 7058.3 | |
| 617. |
What is the ratio of adiabatic compressibility to isothermal compressibility ? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | >> 1 |
| Answer» C. > 1 | |
| 618. |
A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is Φi yi P = Yi xi fi° where, Φ is a vapor fugacity component, Yi is the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of$ |
| A. | temperature only. |
| B. | temperature and pressure only. |
| C. | temperature, pressure and liquid composition xi only. |
| D. | temperature, pressure, liquid composition xi and vapour composition yi. |
| Answer» D. temperature, pressure, liquid composition xi and vapour composition yi. | |
| 619. |
As the temperature is lowered towards the absolute zero, the value of the quantity approaches |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | none of these |
| Answer» B. unity | |
| 620. |
is the mathematical expression for |
| A. | CV |
| B. | entropy change |
| C. | Gibbs free energy |
| D. | none of these |
| Answer» E. | |
| 621. |
Free energy |
| A. | decreases in all spontaneous (or irreversible) processes. |
| B. | change during a spontaneous process has a negative value. |
| C. | remains unchanged in reversible processes carried at constant temperature and pressure. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 622. |
The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law ) |
| A. | V1/V2 |
| B. | V2/V1 |
| C. | V1-V2 |
| D. | V1.V2 |
| Answer» B. V2/V1 | |
| 623. |
The most important application of distribution law is in |
| A. | evaporation |
| B. | liquid extraction |
| C. | drying |
| D. | distillation |
| Answer» C. drying | |
| 624. |
__________ law of thermodynamics ascertains the direction of a particular spontaneous process. |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 625. |
The energy of activation of exothermic reaction is |
| A. | zero. |
| B. | negative. |
| C. | very large compared to that for en-dothermic reaction. |
| D. | not possible to predict. |
| Answer» E. | |
| 626. |
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about |
| A. | 0.5 |
| B. | 3.5 |
| C. | 4.5 |
| D. | 8.5 |
| Answer» C. 4.5 | |
| 627. |
The activity of an ideal gas is numerically __________ its pressure. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | data insufficient, can't be predicted |
| Answer» D. data insufficient, can't be predicted | |
| 628. |
Gibbs phase rule finds application, when heat transfer occurs by |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | condensation |
| Answer» E. | |
| 629. |
In an ideal solution, the activity of a component equals its |
| A. | mole fraction. |
| B. | fugacity at the same temperature and pressure. |
| C. | partial pressure. |
| D. | none of these. |
| Answer» B. fugacity at the same temperature and pressure. | |
| 630. |
The enthalpy change when ammonia gas is dissolved in water is called the heat of |
| A. | solution |
| B. | formation |
| C. | dilution |
| D. | combustion |
| Answer» B. formation | |
| 631. |
For an ideal gas, the enthalpy |
| A. | increases with rise in pressure. |
| B. | decreases with rise in pressure. |
| C. | is independent of pressure. |
| D. | is a path function. |
| Answer» D. is a path function. | |
| 632. |
dW and dq are not the exact differential, because q and W are |
| A. | state functions |
| B. | path functions |
| C. | intensive properties |
| D. | extensive properties |
| Answer» C. intensive properties | |
| 633. |
During a reversible isothermal expansion of an ideal gas, the entropy change is |
| A. | #NAME? |
| B. | 0 |
| C. | #NAME? |
| D. | ‚àû |
| Answer» B. 0 | |
| 634. |
Which one is true for a throttling process ? |
| A. | A gas may have more than one inversion temperatures. |
| B. | The inversion temperature is different for different gases. |
| C. | The inversion temperature is same for all gases. |
| D. | The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity. |
| Answer» C. The inversion temperature is same for all gases. | |
| 635. |
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | an indeterminate value |
| Answer» C. infinity | |
| 636. |
Which of the following exemplifies an adiabatic process ? |
| A. | Melting of ice. |
| B. | Condensation of alcohol vapor. |
| C. | Sudden bursting of a cycle tube. |
| D. | Evaporation of water. |
| Answer» D. Evaporation of water. | |
| 637. |
In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when |
| A. | n = y = 1.4 |
| B. | n = 0 |
| C. | n = 1 |
| D. | n = 1.66 |
| Answer» D. n = 1.66 | |
| 638. |
In an ideal gas mixture, fugacity of a species is equal to its |
| A. | vapor pressure |
| B. | partial pressure |
| C. | chemical potential |
| D. | none of these |
| Answer» C. chemical potential | |
| 639. |
In the reaction; N2 + O2 2NO, increasing the pressure will result in |
| A. | shifting the equilibrium towards right, |
| B. | shifting the equilibrium towards left. |
| C. | no change in equilibrium condition. |
| D. | none of these. |
| Answer» D. none of these. | |
| 640. |
A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively) |
| A. | logarithmic |
| B. | arithmetic |
| C. | geometric |
| D. | harmonic |
| Answer» D. harmonic | |
| 641. |
Isentropic process means a constant __________ process. |
| A. | enthalpy |
| B. | pressure |
| C. | entropy . |
| D. | none of these |
| Answer» D. none of these | |
| 642. |
The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of |
| A. | T |
| B. | T and P |
| C. | T, P and Z |
| D. | T and Z |
| Answer» C. T, P and Z | |
| 643. |
Fugacity is a measure of the |
| A. | escaping tendencies of the same substance in different phases of a system. |
| B. | relative volatility of a mixture of two miscible liquids. |
| C. | behaviour of ideal gases. |
| D. | none of these. |
| Answer» B. relative volatility of a mixture of two miscible liquids. | |
| 644. |
For a constant volume process __________ by the system is used only to increase the internal energy. |
| A. | heat absorbed |
| B. | work done |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» B. work done | |
| 645. |
A gas shows deviation from ideal behaviour at |
| A. | low pressure and high temperature. |
| B. | low pressure and low temperature. |
| C. | low temperature and high pressure. |
| D. | high temperature and high pressure. |
| Answer» D. high temperature and high pressure. | |
| 646. |
Helmholtz free energy (A) is defined as |
| A. | A = H - TS |
| B. | A = E - TS |
| C. | A = H + TS |
| D. | none of these |
| Answer» C. A = H + TS | |
| 647. |
First law of thermodynamics deals with the |
| A. | direction of energy transfer. |
| B. | reversible processes only. |
| C. | irreversible processes only. |
| D. | none of these. |
| Answer» B. reversible processes only. | |
| 648. |
The change in Gibbs freee energy for vaporisation of a pure substance is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | may be positive or negative |
| Answer» D. may be positive or negative | |
| 649. |
Which of the following has the least thermal efficiency ? |
| A. | Steam engine |
| B. | Carnot engine |
| C. | Diesel engine |
| D. | Otto engine |
| Answer» B. Carnot engine | |
| 650. |
Work done may be calculated by the expression for __________ processes. |
| A. | non-flow reversible |
| B. | adiabatic |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |