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.
| 151. |
The accentric factor of a materical, 'ω', is defined as ω = -log₁₀(Prsat)Tr⁻¹ = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always |
| A. | > 2 |
| B. | < 1 |
| C. | > 1 |
| D. | < 3 |
| Answer» C. > 1 | |
| 152. |
Sound waves propagation in air exemplifies an __________ process. |
| A. | adiabatic |
| B. | isothermal |
| C. | isometric |
| D. | none of these |
| Answer» B. isothermal | |
| 153. |
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. | y = 1.44 |
| D. | 1.66 |
| Answer» B. 1 | |
| 154. |
In the equation PVⁿ = constant, if the value of n = y = Cᵨ/Cᵥ, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | adiabatic |
| C. | isentropic |
| D. | polytropic |
| Answer» D. polytropic | |
| 155. |
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 | |
| 156. |
Entropy change for an irreversible process taking system and surrounding together is |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | none of these |
| Answer» C. < 0 | |
| 157. |
A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S₁ and Δ Sʀ are the entropy changes of the system for the irreversible and reversible processes respectively) |
| A. | Δ S₁ is always < Δ Sʀ |
| B. | Δ S₁ is sometimes > Δ Sʀ |
| C. | Δ S₁ is always > Δ Sʀ |
| D. | Δ S₁ is always = Δ Sʀ |
| Answer» D. Δ S₁ is always = Δ Sʀ | |
| 158. |
1m³ of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be |
| A. | 35 K |
| B. | 174 K |
| C. | 274 K |
| D. | 154 K |
| Answer» D. 154 K | |
| 159. |
For an isothermal process, the internal energy of a gas |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | data insufficient, can't be predicted |
| Answer» D. data insufficient, can't be predicted | |
| 160. |
Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation. |
| A. | polar |
| B. | non-polar |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 161. |
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. | |
| 162. |
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 | |
| 163. |
The expression, nRT ln(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 | |
| 164. |
Claude's liquefaction process employs the cooling of gases by |
| A. | expansion in an engine |
| B. | following a constant pressure cycle |
| C. | throttling |
| D. | none of these |
| Answer» B. following a constant pressure cycle | |
| 165. |
__________ explains the equilibrium constant for any chemical reaction. |
| A. | Henry's law |
| B. | Law of mass action |
| C. | Hess's law |
| D. | none of these |
| Answer» C. Hess's law | |
| 166. |
The adiabatic throttling process of a perfect gas is one of constant enthalpy |
| A. | in which there is a temperature drop. |
| B. | which is exemplified by a non-steady flow expansion. |
| C. | which can be performed in a pipe with a constriction. |
| D. | in which there is an increase in temperature. |
| Answer» D. in which there is an increase in temperature. | |
| 167. |
A solid is transformed into vapour without going to the liquid phase at |
| A. | triple point |
| B. | boiling point |
| C. | below triple point |
| D. | always |
| Answer» B. boiling point | |
| 168. |
In the equation, PVⁿ = constant, if the value of n is in between 1 and y (i.e. Cᵨ/Cᵥ), then it represents a reversible __________ process. |
| A. | isometric |
| B. | polytropic |
| C. | isentropic |
| D. | isobaric |
| Answer» C. isentropic | |
| 169. |
There is a change in __________ during the phase transition. |
| A. | volume |
| B. | pressure |
| C. | temperature |
| D. | all a, b & c |
| Answer» B. pressure | |
| 170. |
PVʸ = Constant (where, γ = Cᵨ/Cᵥ) is valid for a/an __________ process. |
| A. | isothermal |
| B. | isentropic |
| C. | isobaric |
| D. | adiabatic |
| Answer» E. | |
| 171. |
Cᵨ - Cᵥ = R is valid for __________ gases. |
| A. | ideal |
| B. | all |
| C. | very high pressure |
| D. | very low temperature |
| Answer» B. all | |
| 172. |
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 | |
| 173. |
An isolated system can exchange __________ with its surroundings. |
| A. | matter |
| B. | energy |
| C. | neither matter nor energy |
| D. | both matter and energy |
| Answer» D. both matter and energy | |
| 174. |
In the reaction, H₂ + I₂ ↔ 2HI, addition of an inert gas will |
| A. | increase the partial pressure of H₂. |
| B. | increase the partial pressure of I₂. |
| C. | increase the total pressure and hence shift the equilibrium towards the right. |
| D. | not effect the equilibrium conditions |
| Answer» E. | |
| 175. |
When a gas is subjected to adiabatic expansion, it gets cooled due to |
| A. | decrease in velocity. |
| B. | decrease in temperature. |
| C. | decrease in kinetic energy. |
| D. | energy spent in doing work. |
| Answer» E. | |
| 176. |
Free energy changes for two reaction mechanism 'X' and 'Y' are respectively - 15 and - 5 units. It implies that X is |
| A. | slower than Y |
| B. | faster than Y |
| C. | three times slower than Y |
| D. | three times faster than Y |
| Answer» C. three times slower than Y | |
| 177. |
The equation, Cᵨ - 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) | |
| 178. |
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. | |
| 179. |
Lenz's law results from the law of conservation of |
| A. | mass |
| B. | momentum |
| C. | energy |
| D. | none of these |
| Answer» D. none of these | |
| 180. |
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 | |
| 181. |
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) | |
| 182. |
For the gaseous phase chemical reaction, C₂H₄(g) + H₂O(g) ↔ C₂H₅OH(g), the equilibrium conversion does not depend on the |
| A. | steam to ethylene ratio. |
| B. | temperature. |
| C. | pressure. |
| D. | none of these. |
| Answer» E. | |
| 183. |
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. | |
| 184. |
The internal energy of a gas obeying P (V - b) RT (where, b is a positive constant and has a constant Cᵥ), depends upon its |
| A. | pressure |
| B. | volume |
| C. | temperature |
| D. | all (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |
| 185. |
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 | |
| 186. |
One ton of refrigeration capacity is equivalent to the heat removal rate of |
| A. | 50 k cal/hr |
| B. | 200 BTU/hr |
| C. | 200 BTU/minute |
| D. | 200 BTU/day |
| Answer» D. 200 BTU/day | |
| 187. |
The expression for entropy change, ΔS = n Cp . ln (T₂/T1), is valid for the __________ of a substance. |
| A. | simultaneous pressure & temperature change |
| B. | heating |
| C. | cooling |
| D. | both (b) and (c) |
| Answer» E. | |
| 188. |
If the molar heat capacities (Cᵨ or Cᵥ) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will |
| A. | increase |
| B. | decrease |
| C. | remain unaltered |
| D. | increase or decrease ; depends on the particular reaction |
| Answer» D. increase or decrease ; depends on the particular reaction | |
| 189. |
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. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 190. |
To obtain integrated form of Clausius-Clayperon equation given by following equation, from the exact Clayperon equafion, it is assumed that the |
| A. | volume of the liquid phase is negligible compared to that of vapour phase. |
| B. | vapour phase behaves as an ideal gas. |
| C. | heat of vaporisation is independent of temperature. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 191. |
The value of Cᵨ & 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 | |
| 192. |
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. | |
| 193. |
When pressure is applied on the system, ice ↔ 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. | |
| 194. |
Work done may be calculated by the expression ꭍp 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) | |
| 195. |
In the decomposition of PCl₅ represented by, PCl₅ ↔ PCl₃ + Cl₂, 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 | |
| 196. |
Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cᵨ/Cᵥ = 7/5) and the process to be reversible, is |
| A. | 300(3^2/7) |
| B. | 300(3^3/5) |
| C. | 300(33^3/7) |
| D. | 300(3^5/7) |
| Answer» B. 300(3^3/5) | |
| 197. |
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 | |
| 198. |
In case of the decomposition of hydroiodic acid (2HI ↔ H₂ + I₂), addition of H₂ (at equilibrium condition) will |
| A. | increase the partial pressure of I₂. |
| B. | decrease the partial pressure of HI. |
| C. | diminish the degree of dissociation of HI. |
| D. | none of these. |
| Answer» D. none of these. | |
| 199. |
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. | |
| 200. |
Which is not constant for an ideal gas ? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |