MCQOPTIONS
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MCQOPTIONS
This section includes 456 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Internal energy is equal to the heat absorbed in case of a/an ______________ process? |
| A. | Constant volume |
| B. | Polytropic |
| C. | Adiabatic |
| D. | Constant pressure |
| Answer» B. Polytropic | |
| 202. |
Internal energy change of a system over one complete cycle in a cyclic process is__________________? |
| A. | Zero |
| B. | +ve |
| C. | -ve |
| D. | Dependent on the path |
| Answer» B. +ve | |
| 203. |
_______________ increases with increase in pressure? |
| A. | The melting point of wax |
| B. | The boiling point of a liquid |
| C. | Both A. and B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 204. |
In which of the following reaction equilibrium, the value of equilibrium constant Kp will be more than is Kc ? |
| A. | 2HI ⇌ H2 + I2 |
| B. | N2O4 ⇌ 2NO2 |
| C. | 2SO2 + O2 ⇌ 2SO3 |
| D. | None of these |
| Answer» C. 2SO2 + O2 ⇌ 2SO3 | |
| 205. |
In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, 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 | |
| 206. |
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 | |
| 207. |
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 | |
| 208. |
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. | |
| 209. |
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 affect the equilibrium conditions |
| Answer» E. | |
| 210. |
In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible ______________ process? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Isentropic |
| D. | Polytropic |
| Answer» D. Polytropic | |
| 211. |
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 | |
| 212. |
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 | |
| 213. |
In the equation, PVn = constant, if the value of n = 1, then it represents a reversible _____________ process? |
| A. | Isothermal |
| B. | Isobaric |
| C. | Polytropic |
| D. | Adiabatic |
| Answer» B. Isobaric | |
| 214. |
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 | |
| 215. |
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 | |
| 216. |
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. | |
| 217. |
In reactions involving solids and liquids (where change in volume is negligible), the heat of reaction at constant pressure as compared to that at constant volume is_______________? |
| A. | More |
| B. | Less |
| C. | Same |
| D. | Unpredictable; depends on the particular reaction |
| Answer» D. Unpredictable; depends on the particular reaction | |
| 218. |
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 | |
| 219. |
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. | |
| 220. |
In jet refrigerators, the refrigerating fluid is practically always_________________? |
| A. | Water |
| B. | Ammonia |
| C. | Freon |
| D. | Brine |
| Answer» B. Ammonia | |
| 221. |
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in_____________? |
| A. | Enhanced COP |
| B. | Decreased COP |
| C. | No change in the value of COP |
| D. | Increased or decreased COP; depending upon the type of refrigerant |
| Answer» B. Decreased COP | |
| 222. |
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 | |
| 223. |
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 | |
| 224. |
In case of an _______________ process, the temperature of the system increases? |
| A. | Isothermal compression |
| B. | Isothermal expansion |
| C. | Adiabatic expansion |
| D. | Adiabatic compression |
| Answer» E. | |
| 225. |
In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v1 = 1 m3 and v23 m3) is maximum, when the value of ‘n’ is_________________? |
| A. | 0 |
| B. | 1 |
| C. | y = 1.44 |
| D. | 1.66 |
| Answer» B. 1 | |
| 226. |
In case of a close thermodynamic system, there is ______________ across the boundaries? |
| A. | No heat and mass transfer |
| B. | No mass transfer but heat transfer |
| C. | Mass and energy transfer |
| D. | None of these |
| Answer» C. Mass and energy transfer | |
| 227. |
In any spontaneous process, ? |
| A. | Only F decreases |
| B. | Only A decreases |
| C. | Both F and A decreases |
| D. | Both F and A increase |
| Answer» D. Both F and A increase | |
| 228. |
In any spontaneous process, the ______________ free energy decreases ? |
| A. | Helmholtz |
| B. | Gibbs |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 229. |
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 | |
| 230. |
In an irreversible process________________? |
| A. | Tds = dE – dW = 0 |
| B. | dE – dW – Tds = 0 |
| C. | Tds – dE + dW < 0 |
| D. | Tds – dT + dW < 0 |
| Answer» D. Tds – dT + dW < 0 | |
| 231. |
In an ideal solution, the activity of a component equals its __________________? |
| A. | Mole fraction |
| B. | Fugacity at the same temperature and pressure |
| C. | Partial pressure |
| D. | None of these |
| Answer» B. Fugacity at the same temperature and pressure | |
| 232. |
In an ideal refrigeration cycle, the change in internal energy of the fluid is_____________? |
| A. | +ve |
| B. | -ve |
| C. | 0 |
| D. | Either of the above three; depends on the nature of refrigerant |
| Answer» D. Either of the above three; depends on the nature of refrigerant | |
| 233. |
In an ideal gas mixture, fugacity of a species is equal to its___________________? |
| A. | Vapor pressure |
| B. | Partial pressure |
| C. | Chemical potential |
| D. | None of these |
| Answer» C. Chemical potential | |
| 234. |
In a working refrigerator, the value of COP is always__________________? |
| A. | 0 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 235. |
In a turbine, the fluid expands almost_________________? |
| A. | Isothermally |
| B. | Isobarically |
| C. | Adiabatically |
| D. | None of these |
| Answer» D. None of these | |
| 236. |
In a reversible process__________________? |
| A. | Tds = dE + dW |
| B. | dE – dW = Tds |
| C. | dW – dE = Tds |
| D. | Tds – dW + dE >0 |
| Answer» B. dE – dW = Tds | |
| 237. |
In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________? |
| A. | Cp < Cv |
| B. | Cp = Cv |
| C. | Cp > Cv |
| D. | C ≥ Cv |
| Answer» C. Cp > Cv | |
| 238. |
In a homogeneous solution, the fugacity of a component depends upon the __________________? |
| A. | Pressure |
| B. | Composition |
| C. | Temperature |
| D. | All (A), B. and (C) |
| Answer» E. | |
| 239. |
In a homogeneous solution, the activity co-efficient of a component depends upon the_________________? |
| A. | Pressure |
| B. | Composition |
| C. | Temperature |
| D. | All (A), B. and (C) |
| Answer» E. | |
| 240. |
If we increase the pressure on a substance (which is at its triple point), then the triple point __________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | May increase or decrease; depends on the substance |
| Answer» D. May increase or decrease; depends on the substance | |
| 241. |
If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in____________________? |
| A. | Volume |
| B. | Enthalpy |
| C. | Both A. & B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 242. |
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. | |
| 243. |
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the _________________? |
| A. | Maxwell’s equation |
| B. | Clausius-Clapeyron Equation |
| C. | Van Laar equation |
| D. | Nernst Heat Theorem |
| Answer» C. Van Laar equation | |
| 244. |
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c? |
| A. | 100 |
| B. | 50 |
| C. | 205 |
| D. | 200 |
| Answer» E. | |
| 245. |
If the molar heat capacities (Cp 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 | |
| 246. |
If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________? |
| A. | Process must be isobaric |
| B. | Temperature must decrease |
| C. | Process must be adiabatic |
| D. | Both B. and C. |
| Answer» E. | |
| 247. |
If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________? |
| A. | Solubility increases as temperature increases |
| B. | Solubility increases as temperature decreases |
| C. | Solubility is independent of temperature |
| D. | Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution |
| Answer» C. Solubility is independent of temperature | |
| 248. |
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 | |
| 249. |
“If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them”. This is ______________ law? |
| A. | Hess’s |
| B. | Kirchoff’s |
| C. | Lavoisier and Laplace |
| D. | None of these |
| Answer» B. Kirchoff’s | |
| 250. |
If atmospheric temperature and dew point are nearly equal, then the relative humidity is_______________? |
| A. | Zero |
| B. | 50% |
| C. | Almost 100% |
| D. | unpredictable |
| Answer» D. unpredictable | |