MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Gases diffuse faster compared to liquids because of the reason that the liquid molecules |
| A. | are held together by stronger inter-molecular forces. |
| B. | move faster. |
| C. | have no definite shape. |
| D. | are heavier |
| Answer» B. move faster. | |
| 2. |
An ideal gas can be liquified, because |
| A. | its molecular size is very small. |
| B. | its critical temperature is more than 0 C. |
| C. | forces operative between its molecules are negligible. |
| D. | it gets solidified directly without becoming liquid. |
| Answer» D. it gets solidified directly without becoming liquid. | |
| 3. |
In distillation columns, the number of bubble caps per tray primarily depends upon the |
| A. | allowable liquid velocity. |
| B. | allowable gas velocity. |
| C. | allowable gas and liquid velocities. |
| D. | feed composition. |
| Answer» D. feed composition. | |
| 4. |
Drinking (potable) water treatment does not involve |
| A. | coagulation |
| B. | sedimentation |
| C. | softening |
| D. | disinfection |
| Answer» D. disinfection | |
| 5. |
Phenol formaldehyde resin is used as an adhesive in making |
| A. | laminates |
| B. | card boxes |
| C. | furniture |
| D. | books |
| Answer» B. card boxes | |
| 6. |
DDT should not be allowed to come in contact with iron (during its manufacture) to |
| A. | avoid its decomposition. |
| B. | prevent sulphonation of the monochlorobenzene by the acid catalyst. |
| C. | achieve non-hygroscopic property. |
| D. | none of these. |
| Answer» B. prevent sulphonation of the monochlorobenzene by the acid catalyst. | |
| 7. |
The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is |
| A. | alumina |
| B. | silica gel |
| C. | platinum |
| D. | nickel |
| Answer» B. silica gel | |
| 8. |
A good quality coal should have |
| A. | low fusion point of ash |
| B. | high ash content |
| C. | high sulphur content |
| D. | none of these |
| Answer» E. | |
| 9. |
Zeolite used in water softening process (cation exchange) is regenerated by washing with |
| A. | brine |
| B. | chloramines |
| C. | sodium bisulphite |
| D. | liquid chlorines |
| Answer» B. chloramines | |
| 10. |
Melting of wax is accompanied with __________ in entropy. |
| A. | increase |
| B. | decrease |
| C. | no change |
| D. | none of these |
| Answer» B. decrease | |
| 11. |
A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by |
| A. | <i>P<sub>1</sub>ACBP<sub>2</sub>P<sub>1</sub></i> |
| B. | <i>ACBB<sup>1</sup>A<sup>1</sup>A </i> |
| C. | <i>ACBDA</i> |
| D. | <i>ADBB<sup>1</sup>A<sup>1</sup>A</i> |
| Answer» D. <i>ADBB<sup>1</sup>A<sup>1</sup>A</i> | |
| 12. |
Work done in case of free expansion is |
| A. | indeterminate |
| B. | zero |
| C. | negative |
| D. | none of these |
| Answer» C. negative | |
| 13. |
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is |
| A. | 0 |
| B. | 1 |
| C. | |
| D. | none of these |
| Answer» C. | |
| 14. |
During adiabatic expansion of gas |
| A. | pressure remains constant. |
| B. | pressure is increased. |
| C. | temperature remains constant. |
| D. | none of these. |
| Answer» E. | |
| 15. |
The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» C. 3 | |
| 16. |
Cp - Cv = R is valid for __________ gases. |
| A. | ideal |
| B. | all |
| C. | very high pressure |
| D. | very low temperature |
| Answer» B. all | |
| 17. |
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 | |
| 18. |
Which is an example of closed system ? |
| A. | Air compressor |
| B. | Lquid cooling system of an automobile |
| C. | Boiler |
| D. | None of these |
| Answer» C. Boiler | |
| 19. |
Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/391-10-2.png"> | |
| 20. |
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 | |
| 21. |
Gibbs free energy of mixing at constant pressure and temperature is always |
| A. | 0 |
| B. | |
| C. | + ve |
| D. | - ve |
| Answer» E. | |
| 22. |
The compressibility factor for an ideal gas is 1. Its value for any other real gas is |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | either (b) or (c), depends on the nature of the gas |
| Answer» E. | |
| 23. |
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. | |
| 24. |
Which of the following is an extensive property of a system ? |
| A. | Heat capacity |
| B. | Molal heat capacity |
| C. | Pressure |
| D. | Concentration |
| Answer» B. Molal heat capacity | |
| 25. |
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 | |
| 26. |
Which of the following is not a common refrigerant ? |
| A. | Freon-12 |
| B. | Ethylene |
| C. | Ammonia |
| D. | Carbon dioxide |
| Answer» C. Ammonia | |
| 27. |
The most important application of distribution law is in |
| A. | evaporation |
| B. | liquid extraction |
| C. | drying |
| D. | distillation |
| Answer» C. drying | |
| 28. |
Air-refrigeration cycle |
| A. | is the most efficient of all refrigeration cycles. |
| B. | has very low efficiency. |
| C. | requires relatively large quantities of air to achieve a significant amount of refrigeration. |
| D. | both (b) and (c). |
| Answer» E. | |
| 29. |
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the |
| A. | two temperatures only. |
| B. | pressure of working fluid. |
| C. | mass of the working fluid. |
| D. | mass and pressure both of the working fluid. |
| Answer» B. pressure of working fluid. | |
| 30. |
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. | |
| 31. |
The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzman's constant, T = absolute temperature) |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/414-343-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/414-343-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/414-343-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/414-343-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/414-343-3.png"> | |
| 32. |
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. | |
| 33. |
The expression for entropy change given by, S = - nR ln (P2/P1), holds good for |
| A. | expansion of a real gas. |
| B. | reversible isothermal volume change. |
| C. | heating of an ideal gas. |
| D. | cooling of a real gas. |
| Answer» C. heating of an ideal gas. | |
| 34. |
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 | |
| 35. |
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. | |
| 36. |
Boiling of liquid is accompanied with increase in the |
| A. | vapor pressure. |
| B. | specific Gibbs free energy. |
| C. | specific entropy. |
| D. | all (a), (b) and (c). |
| Answer» B. specific Gibbs free energy. | |
| 37. |
Change of state namely evaportation condensation, freezing and melting is an __________ process. |
| A. | isothermal |
| B. | adiabatic |
| C. | isobaric |
| D. | isochoric |
| Answer» B. adiabatic | |
| 38. |
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 | |
| 39. |
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. | |
| 40. |
The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is |
| A. | 0 |
| B. | +ve |
| C. | -ve |
| D. | |
| Answer» C. -ve | |
| 41. |
A Carnot cycle consists of the following steps : |
| A. | Two isothermals and two isentropics. |
| B. | Two isobarics and two isothermals. |
| C. | Two isochorics and two isobarics. |
| D. | Two isothermals and two isochorics. |
| Answer» B. Two isobarics and two isothermals. | |
| 42. |
Sound waves propagation in air exemplifies an __________ process. |
| A. | adiabatic |
| B. | isothermal |
| C. | isometric |
| D. | none of these |
| Answer» B. isothermal | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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. | |
| 46. |
The catalyst used in shift converter is |
| A. | nickel |
| B. | vanadium |
| C. | silica gel |
| D. | alumina |
| Answer» B. vanadium | |
| 47. |
Which of the following is a detergent ? |
| A. | Benzene hexachloride |
| B. | Alkyl benzene sulphonate |
| C. | Polytetraflouroethylene |
| D. | Cellulose nitrate |
| Answer» C. Polytetraflouroethylene | |
| 48. |
In distillation, overhead product contains |
| A. | only one component |
| B. | two components |
| C. | any number of components |
| D. | only saturated liquid |
| Answer» D. only saturated liquid | |
| 49. |
With increase in pressure, the relative volatility for a binary system |
| A. | increases. |
| B. | decreases. |
| C. | remains same. |
| D. | either (a) or (b), depends on the system. |
| Answer» C. remains same. | |
| 50. |
Low viscosity absorbent is preferred for reasons of |
| A. | rapid absorption rates and good heat transfer characteristics. |
| B. | improved flooding characteristics. |
| C. | low pressure drop on pumping. |
| D. | all (a), (b) and (c). |
| Answer» E. | |