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.
| 401. |
"When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs". This phenomenon is related to the |
| A. | Gibbs-Duhem equation |
| B. | Gibbs-Helmholtz equation |
| C. | Third law of thermodynamics |
| D. | Joule-Thomson effect |
| Answer» E. | |
| 402. |
Which of the following is not affected by temperature changes ? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | None of these |
| Answer» E. | |
| 403. |
With increase in compression ratio, the efficiency of the otto engine |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | increases linearly |
| Answer» B. decreases | |
| 404. |
The absolute entropy for all crystalline substances at absolute zero temperature is |
| A. | zero |
| B. | negative |
| C. | more than zero |
| D. | indeterminate |
| Answer» B. negative | |
| 405. |
The value of Cp & Cv respectively for monoatomic gases in Kcal/kg Mole . °K are$ |
| A. | 5 & 3 |
| B. | 3.987 & 1.987 |
| C. | 1.987 & 0.66 |
| D. | 0.66 & 1.987 |
| Answer» B. 3.987 & 1.987 | |
| 406. |
At a given temperature, the volume of a gas dissolved in a solvent __________ with increase in pressure. |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | may increase or decrease; depends on the gas |
| Answer» D. may increase or decrease; depends on the gas | |
| 407. |
In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.$ |
| A. | adiabatic |
| B. | isometric |
| C. | isentropic |
| D. | isothermal |
| Answer» C. isentropic | |
| 408. |
Compressibility factor of a gas is |
| A. | not a function of its pressure. |
| B. | not a function of its nature. |
| C. | not a function of its temperature. |
| D. | unity, if it follows PV = nRT. |
| Answer» B. not a function of its nature. | |
| 409. |
At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is$ |
| A. | 1.572 |
| B. | 1.9398 |
| C. | 3.389 |
| D. | 4.238 |
| Answer» B. 1.9398 | |
| 410. |
Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the |
| A. | cold reservoir approaches zero. |
| B. | hot reservoir approaches infinity. |
| C. | either (a) or (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 411. |
Claude gas liquefaction process employs cooling |
| A. | at constant pressure. |
| B. | by throttling. |
| C. | by expansion in an engine. |
| D. | none of these. |
| Answer» D. none of these. | |
| 412. |
The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 0 |
| Answer» C. 2 | |
| 413. |
Normal temperature and pressure (N.T.P.) corresponds to |
| A. | 0°C and 760 mm Hg. |
| B. | 15°C and 760 mm Hg. |
| C. | 20°C and 760 mm Hg. |
| D. | 0°C and 1 kgf/cm2. |
| Answer» D. 0¬∞C and 1 kgf/cm2. | |
| 414. |
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is |
| A. | 2 |
| B. | 0 |
| C. | 1 |
| D. | 3 |
| Answer» B. 0 | |
| 415. |
First law of thermodynamics is mathematically stated as |
| A. | dQ = dE + dW |
| B. | dQ = dE - dW |
| C. | dE = dQ + dW |
| D. | dW = dQ + dE |
| Answer» B. dQ = dE - dW | |
| 416. |
For an ideal gas, the internal energy depends upon its __________ only. |
| A. | molecular size |
| B. | temperature |
| C. | volume |
| D. | pressure |
| Answer» C. volume | |
| 417. |
The internal energy of an ideal gas is a function of its __________ only. |
| A. | molecular size |
| B. | volume |
| C. | pressure |
| D. | temperature |
| Answer» E. | |
| 418. |
The unit of equilibrium constant of a chemical reaction is the same as that of |
| A. | molar concentration |
| B. | temperature |
| C. | internal energy |
| D. | none of these |
| Answer» E. | |
| 419. |
Rotary lime kiln is an example of a/an __________ system. |
| A. | closed |
| B. | open |
| C. | isolated |
| D. | non-thermodynamic |
| Answer» C. isolated | |
| 420. |
The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is |
| A. | 0 |
| B. | #NAME? |
| C. | #NAME? |
| D. | ‚àû |
| Answer» C. #NAME? | |
| 421. |
What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ? |
| A. | 2 |
| B. | 0 |
| C. | 3 |
| D. | 1 |
| Answer» B. 0 | |
| 422. |
In a P-V diagram (for an ideal gas), an isothermal curve will coincide withan adiabatic curve (through a point), when |
| A. | Cp < Cv |
| B. | Cp = Cv |
| C. | Cp > Cv |
| D. | C ‚â• Cv |
| Answer» C. Cp > Cv | |
| 423. |
The standard state of a gas (at a given temperature) is the state in which fugacity is equal to |
| A. | unity |
| B. | activity |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 424. |
__________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low. |
| A. | Bucket |
| B. | Throttling |
| C. | Separating |
| D. | A combination of separating & throttling |
| Answer» E. | |
| 425. |
In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible __________ process. |
| A. | isobaric |
| B. | isothermal |
| C. | isentropic |
| D. | isometric |
| Answer» B. isothermal | |
| 426. |
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions. |
| A. | The amount of work needed is path dependent. |
| B. | Work alone can not bring out such a change of state. |
| C. | The amount of work needed is independent of path. |
| D. | More information is needed to conclude anything about the path dependence or otherwise of the work needed. |
| Answer» B. Work alone can not bring out such a change of state. | |
| 427. |
The temperature at the eutectic point of the system is the __________ temperature that can be attained in the system. |
| A. | lowest |
| B. | highest |
| C. | average |
| D. | none of these |
| Answer» B. highest | |
| 428. |
Entropy is a/an |
| A. | state function |
| B. | macroscopic property |
| C. | extensive property |
| D. | none of these |
| Answer» E. | |
| 429. |
__________ functions are exemplified by heat and work. |
| A. | Path |
| B. | Point |
| C. | State |
| D. | none of these |
| Answer» B. Point | |
| 430. |
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is |
| A. | < 0 |
| B. | > 0 |
| C. | 0 |
| D. | none of these |
| Answer» B. > 0 | |
| 431. |
A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature. |
| A. | less than |
| B. | more than |
| C. | equal to or higher than |
| D. | less than or equal to |
| Answer» E. | |
| 432. |
The work done in an adiabatic change in a particular gas depends upon changes in the __________ only. |
| A. | temperature |
| B. | specific heat |
| C. | volume |
| D. | pressure |
| Answer» B. specific heat | |
| 433. |
If two gases have same reduced temperature and reduced pressure, then they will have the same |
| A. | volume |
| B. | mass |
| C. | critical temperature |
| D. | none of these |
| Answer» E. | |
| 434. |
A refrigeration cycle is the same as a __________ cycle, |
| A. | turbine |
| B. | heat engine |
| C. | reversed heat engine |
| D. | none of these |
| Answer» D. none of these | |
| 435. |
With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | decreases linearly |
| Answer» B. decreases | |
| 436. |
Joule-Thomson co-efficient depends on the |
| A. | pressure. |
| B. | temperature. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 437. |
Pick out the undesirable property for a good refrigerant. |
| A. | high thermal conductivity |
| B. | low freezing point |
| C. | large latent heat of vaporisation |
| D. | high viscosity |
| Answer» E. | |
| 438. |
Which of the following is not correct for a reversible adiabatic process ? |
| A. | TVγ-1 = constant |
| B. | p1-γ.TY = constant |
| C. | PVγ = constant |
| D. | none of these |
| Answer» E. | |
| 439. |
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be |
| A. | same |
| B. | doubled |
| C. | halved |
| D. | one fourth of its original value |
| Answer» B. doubled | |
| 440. |
Clayperon equation deals with the |
| A. | rate of change of vapour pressure with temperature. |
| B. | effect of an inert gas on vapour pressure. |
| C. | calculation of ΔF for spontaneous phase change. |
| D. | temperature dependence of heat of phase transition. |
| Answer» B. effect of an inert gas on vapour pressure. | |
| 441. |
Which is a state function ? |
| A. | Specific volume |
| B. | Work |
| C. | Pressure |
| D. | Temperature |
| Answer» C. Pressure | |
| 442. |
Consider the process A & B shown in the figure given below In this case, it is possilbe that |
| A. | both the processes are adiabatic. |
| B. | both the processes are isothermal. |
| C. | process A is isothermal while B is adiabatic. |
| D. | process A is adiabatic while B is isothermal. |
| Answer» D. process A is adiabatic while B is isothermal. | |
| 443. |
For an exothremic reaction |
| A. | only enthalpy change (ΔH) is negative. |
| B. | only internal energy change (ΔE) is negative. |
| C. | both ΔH and ΔE are negative. |
| D. | enthalpy change is zero. |
| Answer» D. enthalpy change is zero. | |
| 444. |
Fugacity co-efficient of a substance is the ratio of its fugacity to |
| A. | mole fraction |
| B. | activity |
| C. | pressure |
| D. | activity co-efficient |
| Answer» D. activity co-efficient | |
| 445. |
One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one |
| A. | hour |
| B. | day |
| C. | minute |
| D. | second |
| Answer» C. minute | |
| 446. |
The equation relating E, P, V and T which is true for all substanes under all conditions is given by .This equation is called the |
| A. | Maxwell's equation. |
| B. | thermodynamic equation of state. |
| C. | equation of state. |
| D. | Redlich-Kwong equation of state. |
| Answer» C. equation of state. | |
| 447. |
The chemical potential for a pure substance is __________ its partial molal free energy. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | not related to |
| Answer» D. not related to | |
| 448. |
The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition. |
| A. | internal energy |
| B. | enthalpy |
| C. | Gibbs free energy |
| D. | Helmholtz free energy |
| Answer» D. Helmholtz free energy | |
| 449. |
Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K )$ |
| A. | λb/Tb |
| B. | Tb/λb |
| C. | λb/Tb |
| D. | Tb/λb |
| Answer» B. Tb/Œªb | |
| 450. |
Cp - Cv = R is valid for __________ gases. |
| A. | ideal |
| B. | all |
| C. | very high pressure |
| D. | very low temperature |
| Answer» B. all | |