MCQOPTIONS
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MCQOPTIONS
This section includes 469 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. |
In the decomposition of PCl5 represented by, PCl5 ‚áã PCl3 + Cl‚ÇÇ, decrease in the pressure of the system will __________ the degree of dissociation of PCl5.? |
| A. | Increase |
| B. | Decrease |
| C. | Not alter |
| D. | None of these |
| Answer» B. Decrease | |
| 402. |
The shape of T-S diagram for Carnot Cycle is a? |
| A. | Rectangle |
| B. | Rhombus |
| C. | Trapezoid |
| D. | Circle |
| Answer» B. Rhombus | |
| 403. |
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 | |
| 404. |
Which of the following processes can not be made reversible even under ideal condition of operation?? |
| A. | Free expansion of a gas |
| B. | Compression of air in a compressor |
| C. | Expansion of steam in a turbine |
| D. | All of the above |
| Answer» B. Compression of air in a compressor | |
| 405. |
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 | |
| 406. |
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system? |
| A. | Its internal energy (U) decreases and its entropy (S) increases |
| B. | U and S both decreases |
| C. | U decreases but S is constant |
| D. | U is constant but S decreases |
| Answer» C. U decreases but S is constant | |
| 407. |
Which of the following is not a common refrigerant?? |
| A. | Freon-12 |
| B. | Ethylene |
| C. | Ammonia |
| D. | Carbon dioxide |
| Answer» C. Ammonia | |
| 408. |
Which of the following is affected by the temperature?? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | All of the above |
| Answer» E. | |
| 409. |
Which of the following has the minimum value of COP for a given refrigeration effect?? |
| A. | Reverse Carnot cycle |
| B. | Ordinary vapour-compression cycle |
| C. | Vapour-compression process with a reversible expansion engine |
| D. | Air refrigeration cycle |
| Answer» E. | |
| 410. |
Any substance above its critical temperature exists as? |
| A. | Saturated vapour |
| B. | Solid |
| C. | Gas |
| D. | Liquid |
| Answer» D. Liquid | |
| 411. |
In the reaction, represented by, 2SO₂ + O₂ ⇋ 2SO₃; ΔH = - 42 kcal; the forward reaction will be favoured by? |
| A. | Low temperature |
| B. | High pressure |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 412. |
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 | |
| 413. |
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 | |
| 414. |
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 | |
| 415. |
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are? |
| A. | 4 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 416. |
Dry ice is? |
| A. | Moisture free ice |
| B. | Solid helium |
| C. | Solid carbon dioxide |
| D. | None of these |
| Answer» D. None of these | |
| 417. |
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 | |
| 418. |
Efficiency of a Carnot engine working between temperatures T‚ÇÅ and T‚ÇÇ (T‚ÇÅ < T‚ÇÇ) is? |
| A. | (T‚ÇÇ - T‚ÇÅ)/T‚ÇÇ |
| B. | (T‚ÇÇ - T‚ÇÅ)/T‚ÇÅ |
| C. | (T‚ÇÅ - T‚ÇÇ)/T‚ÇÇ |
| D. | (T‚ÇÅ - T‚ÇÇ)/T‚ÇÅ |
| Answer» B. (T‚Äö√á√á - T‚Äö√á√Ö)/T‚Äö√á√Ö | |
| 419. |
Rotary lime kiln is an example of a/an __________ system.? |
| A. | Closed |
| B. | Open |
| C. | Isolated |
| D. | Non-thermodynamic |
| Answer» C. Isolated | |
| 420. |
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is? |
| A. | Same in both the phases |
| B. | Zero in both the phases |
| C. | More in vapour phase |
| D. | More in liquid phase |
| Answer» B. Zero in both the phases | |
| 421. |
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 | |
| 422. |
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 | |
| 423. |
Which of the following behaves most closely like an ideal gas?? |
| A. | He |
| B. | N‚ÇÇ |
| C. | O‚ÇÇ |
| D. | H‚ÇÇ |
| Answer» B. N‚Äö√á√á | |
| 424. |
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. | |
| 425. |
The equation, PV = nRT, is best obeyed by gases at? |
| A. | Low pressure & high temperature |
| B. | High pressure & low temperature |
| C. | Low pressure & low temperature |
| D. | None of these |
| Answer» B. High pressure & low temperature | |
| 426. |
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 | |
| 427. |
In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible __________ process.? |
| A. | Isometric |
| B. | Polytropic |
| C. | Isentropic |
| D. | Isobaric |
| Answer» C. Isentropic | |
| 428. |
A system is said to be isopiestic, if there is no __________ change.? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | None of these |
| Answer» C. Volume | |
| 429. |
The most important application of distribution law is in? |
| A. | Evaporation |
| B. | Liquid extraction |
| C. | Drying |
| D. | Distillation |
| Answer» C. Drying | |
| 430. |
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 | |
| 431. |
Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | First fall and then rise |
| Answer» B. Decrease | |
| 432. |
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is? |
| A. | Superheated vapour |
| B. | Partially condensed vapour with quality of 0.9 |
| C. | Saturated vapour |
| D. | Partially condensed vapour with quality of 0.1 |
| Answer» B. Partially condensed vapour with quality of 0.9 | |
| 433. |
The kinetic energy of gas molecule is zero at? |
| A. | 0°C |
| B. | 273°C |
| C. | 100°C |
| D. | -273°C |
| Answer» E. | |
| 434. |
When pressure is applied on the system, ice ‚ü∑ water, then$ |
| A. | Equilibrium can not be established |
| B. | More ice will be formed |
| C. | More water will be formed |
| D. | Evaporation of water will take place |
| Answer» D. Evaporation of water will take place | |
| 435. |
Cv is given by |
| A. | (‚à ÇE/‚à ÇT)V |
| B. | (‚à ÇE/‚à ÇV)T |
| C. | (‚à ÇE/‚à ÇP)V |
| D. | (‚à ÇV/‚à ÇT)P |
| Answer» B. (‚Äö√ √áE/‚Äö√ √áV)T | |
| 436. |
The expression, ΔG = nRT .In P₂/P₁ , gives the free energy change$ |
| A. | With pressure changes at constant temperature |
| B. | Under reversible isothermal volume change |
| C. | During heating of an ideal gas |
| D. | During cooling of an ideal gas |
| Answer» B. Under reversible isothermal volume change | |
| 437. |
In the reaction; N‚ÇÇ + O‚ÇÇ ‚áã 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 | |
| 438. |
The equation relating E, P, V and T which is true for all substanes under all conditions is given by (‚à ÇE/‚à ÇV)T = T.(‚à ÇP/‚à ÇT)H - P . This equation is called the$ |
| A. | Maxwell |
| B. | Thermodynamic equation of state |
| C. | Equation of state |
| D. | Redlich-Kwong equation of state |
| Answer» C. Equation of state | |
| 439. |
The expression for entropy change given by, ΔS = nR ln (V₂/V₁) + nCv ln (T₂/T₁) is valid for$ |
| A. | Reversible isothermal volume change |
| B. | Heating of a substance |
| C. | Cooling of a substance |
| D. | Simultaneous heating and expansion of an ideal gas |
| Answer» E. | |
| 440. |
Which of the following non-flow reversible compression processes require maximum work? |
| A. | Adiabatic process |
| B. | Isothermal process |
| C. | Isobaric process |
| D. | All of the above |
| Answer» B. Isothermal process | |
| 441. |
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 | |
| 442. |
Work done may be calculated by the expression ‚à ´p dA for __________ processes.$ |
| A. | Non-flow reversible |
| B. | Adiabatic |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 443. |
PVy = constant, holds good for an isentropic process, which is |
| A. | Reversible and isothermal |
| B. | Isothermal and irreversible |
| C. | Reversible and adiabatic |
| D. | Adiabatic and irreversible |
| Answer» D. Adiabatic and irreversible | |
| 444. |
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 | |
| 445. |
The expression, nRT In P‚ÇÅ/P‚ÇÇ , 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 | |
| 446. |
Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.$ |
| A. | 270 |
| B. | 327 |
| C. | 300 |
| D. | 540 |
| Answer» C. 300 | |
| 447. |
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. | |
| 448. |
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is |
| A. | (‚à ÇT/‚à ÇV)S = -(‚à ÇP/‚à ÇS)V |
| B. | (‚à ÇS/‚à ÇP)T = -(‚à ÇV/‚à ÇT)P |
| C. | (‚à ÇV/‚à ÇS)P = (‚à ÇT/‚à ÇP)S |
| D. | (‚à ÇS/‚à ÇV)T = (‚à ÇP/‚à ÇT)V |
| Answer» E. | |
| 449. |
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 P‚ÇÅ and P‚ÇÇ.(where, P‚ÇÅ and P‚ÇÇ are initial and final pressures respectively)$ |
| A. | Logarithmic |
| B. | Arithmetic |
| C. | Geometric |
| D. | Harmonic |
| Answer» D. Harmonic | |
| 450. |
Degree of freedom of a system consisting of a gaseous mixture of H‚ÇÇ and NH‚ÇÉ will be$ |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» E. | |