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.
| 251. |
Efficiency of a Carnot engine working between temperatures T₁ and T₂ (T₁ < T₂) is |
| A. | (T₂ - T₁)/T₂ |
| B. | (T₂ - T₁)/T₁ |
| C. | (T₁ - T₂)/T₂ |
| D. | (T₁ - T₂)/T₁ |
| Answer» B. (T₂ - T₁)/T₁ | |
| 252. |
The specific heat of saturated water vapour at 100°C is |
| A. | ∞ |
| B. | -ve |
| C. | 0 |
| D. | +ve |
| Answer» C. 0 | |
| 253. |
The equation, Cp - Cv = R, is true for __________ gas. |
| A. | No |
| B. | Any real |
| C. | Only ideal |
| D. | Both B and C |
| Answer» D. Both B and C | |
| 254. |
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 | |
| 255. |
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 | |
| 256. |
Rotary lime kiln is an example of a/an __________ system. |
| A. | Closed |
| B. | Open |
| C. | Isolated |
| D. | Non-thermodynamic |
| Answer» C. Isolated | |
| 257. |
Which of the following is not a common refrigerant? |
| A. | Freon-12 |
| B. | Ethylene |
| C. | Ammonia |
| D. | Carbon dioxide |
| Answer» C. Ammonia | |
| 258. |
Work done may be calculated by the expression ∫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 | |
| 259. |
Which is not constant for an ideal gas? |
| A. | (∂P/∂V)T |
| B. | (∂V/∂T)P |
| C. | (∂P/∂V)V |
| D. | All of the above |
| Answer» B. (∂V/∂T)P | |
| 260. |
Consider the reaction, C + O₂ ⇋ CO₂ ;ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO₂ → C + O₂? |
| A. | -94 kcal |
| B. | + 94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 261. |
Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is - 57°C and 5.2 atm). |
| A. | Pressure must be kept below 5.2 atm |
| B. | Temperature must be kept above - 57°C |
| C. | Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C |
| D. | Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively |
| Answer» E. | |
| 262. |
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 | |
| 263. |
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 | |
| 264. |
What is the value of ln y (where y = activity co-efficient) for ideal gases? |
| A. | Zero |
| B. | Unity |
| C. | Infinity |
| D. | Negative |
| Answer» B. Unity | |
| 265. |
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is |
| A. | A . x₂² |
| B. | Ax₁ |
| C. | Ax₂ |
| D. | Ax₁² |
| Answer» B. Ax₁ | |
| 266. |
What is the value of Joule-Thomson co-efficient for an ideal gas? |
| A. | +ve |
| B. | -ve |
| C. | 0 |
| D. | ∞ |
| Answer» D. ∞ | |
| 267. |
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 | |
| 268. |
What is the ratio of adiabatic compressibility to isothermal compressibility? |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | >> 1 |
| Answer» C. > 1 | |
| 269. |
In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants ) |
| A. | Addition of inert gas favours the forward reaction, when Δx is positive |
| B. | Pressure has no effect on equilibrium, when Δn = 0 |
| C. | Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve) or zero) |
| D. | All of the above |
| Answer» E. | |
| 270. |
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is |
| A. | (∂T/∂V)S = -(∂P/∂S)V |
| B. | (∂S/∂P)T = -(∂V/∂T)P |
| C. | (∂V/∂S)P = (∂T/∂P)S |
| D. | (∂S/∂V)T = (∂P/∂T)V |
| Answer» E. | |
| 271. |
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 | |
| 272. |
At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole. |
| A. | 72 |
| B. | 92 |
| C. | 142 |
| D. | 192 |
| Answer» C. 142 | |
| 273. |
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 | |
| 274. |
In polytropic process (PVn = constant), if n = 1; it means a/an __________ process. |
| A. | Adiabatic |
| B. | Reversible |
| C. | Isothermal |
| D. | None of these |
| Answer» D. None of these | |
| 275. |
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 | |
| 276. |
Cp - Cv = R is valid for __________ gases. |
| A. | Ideal |
| B. | All |
| C. | Very high pressure |
| D. | Very low temperature |
| Answer» B. All | |
| 277. |
1/V (∂V/∂T)p is the mathematical expression |
| A. | Joule-Thomson co-efficient |
| B. | Specific heat at constant pressure (Cp) |
| C. | Co-efficient of thermal expansion |
| D. | Specific heat at constant volume (CV) |
| Answer» D. Specific heat at constant volume (CV) | |
| 278. |
Which of the following is not an intensive property? |
| A. | Chemical potential |
| B. | Surface tension |
| C. | Heat capacity |
| D. | None of these |
| Answer» D. None of these | |
| 279. |
The expression, nRT In P₁/P₂ , 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 | |
| 280. |
In the ammonia synthesis reaction, N₂ + 3H₂ ⇋ 2NH₃ + 22.4 kcal, the formation of NH₃ will be favoured by |
| A. | High temperature |
| B. | Low pressure |
| C. | Low temperature only |
| D. | Both low temperature and high pressure |
| Answer» E. | |
| 281. |
In the reaction, C + O₂ → CO₂ ; ΔH = - 94 kcal. What is the heat content (enthalpy)of O₂? |
| A. | -94 kcal |
| B. | > -94 kcal |
| C. | < - 94 kcal |
| D. | Zero |
| Answer» E. | |
| 282. |
Gibbs free energy (F) is defined as |
| A. | F = E - TS |
| B. | F = H - TS |
| C. | F = H + TS |
| D. | F = E + TS |
| Answer» C. F = H + TS | |
| 283. |
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 | |
| 284. |
Ideal gas law is applicable at |
| A. | Low T, low P |
| B. | High T, high P |
| C. | Low T, high P |
| D. | High T, low P |
| Answer» E. | |
| 285. |
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 | |
| 286. |
In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v₁ = 1 m³ and v₂ 3 m³ ) is max imum, when the value of 'n' is |
| A. | 0 |
| B. | 1 |
| C. | 1.44 |
| D. | 1.66 |
| Answer» B. 1 | |
| 287. |
Which of the following liquid metals has the highest thermal conductivity? |
| A. | Molten sodium |
| B. | Molten lead |
| C. | Mercury |
| D. | Molten potassium |
| Answer» B. Molten lead | |
| 288. |
A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres. |
| A. | 448 |
| B. | 224 |
| C. | 22.4 |
| D. | Data insufficient; can't be computed |
| Answer» B. 224 | |
| 289. |
(∂T/∂P)H is the mathematical expression for |
| A. | Specific heat at constant pressure (Cp) |
| B. | Specific heat at constant volume (Cv) |
| C. | Joule-Thompson co-efficient |
| D. | None of these |
| Answer» D. None of these | |
| 290. |
(∂H/∂T)p is the mathematical expression for |
| A. | CV |
| B. | Entropy change |
| C. | Gibbs free energy |
| D. | None of these |
| Answer» E. | |
| 291. |
(∂E/∂T)V is the mathematical expression for |
| A. | CV |
| B. | Enthalpy change |
| C. | Free energy change |
| D. | None of these |
| Answer» E. | |
| 292. |
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 | |
| 293. |
If heat contents of CH₄, C₂H₄ and C₃H₈ are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH₄(g) + C₂H₄(g) ⇋ C₃H₈(g) will be __________ Kcal. |
| A. | -19.4 |
| B. | -30.2 |
| C. | 55.2 |
| D. | -55.2 |
| Answer» B. -30.2 | |
| 294. |
For the reversible exothermic reaction, N₂ + 3H₂ ⇋ 2NH₃, increase of pressure would |
| A. | Shift the equilibrium towards right |
| B. | Give higher yield of NH₃ |
| C. | Both B and C |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 295. |
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 | |
| 296. |
Which law of the thermodynamics provids basis for measuring the thermodynamic property? |
| A. | First law |
| B. | Zeroth law |
| C. | Third law |
| D. | Second law |
| Answer» C. Third law | |
| 297. |
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 | |
| 298. |
Which of the following is true for Virial equation of state? |
| A. | Virial co-efficients are universal constants |
| B. | Virial co-efficients |
| C. | Virial co-efficients are function of temperature only |
| D. | For some gases, Virial equations and ideal gas equations are the same |
| Answer» D. For some gases, Virial equations and ideal gas equations are the same | |
| 299. |
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 300. |
The shape of T-S diagram for Carnot Cycle is a |
| A. | Rectangle |
| B. | Rhombus |
| C. | Trapezoid |
| D. | Circle |
| Answer» B. Rhombus | |