MCQOPTIONS
Saved Bookmarks
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.
| 151. |
PVγ = Constant (where, γ = Cp/Cv) is valid for a/an ______________ process? |
| A. | Isothermal |
| B. | Isentropic |
| C. | Isobaric |
| D. | Adiabatic |
| Answer» E. | |
| 152. |
Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________? |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Infinity |
| Answer» D. Infinity | |
| 153. |
Pick out the wrong statement_________________? |
| A. | Phase rule variables are intensive properties |
| B. | Heat and work are both state function |
| C. | The work done by expansion of a gas in vacuum is zero |
| D. | CP and CV are state function |
| Answer» C. The work done by expansion of a gas in vacuum is zero | |
| 154. |
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2.Degree of dissociation of PCl5 will_________________? |
| A. | Decrease on addition of Cl2 |
| B. | Increase on addition of an inert gas at constant pressure |
| C. | Decrease on increasing the pressure of the system |
| D. | None of these |
| Answer» E. | |
| 155. |
Pick out the wrong statement. A. The conversion for a gas phase reaction increases with decrease in pressure, if there is an increase in volume accompanying the reaction________________? |
| A. | With increase in temperature, the equilibrium constant increases for an exothermic reaction |
| B. | The equilibrium constant of a reaction depends upon temperature only |
| C. | The conversion for a gas phase reaction increases with increase in pressure, if there is a decrease in volume accompanying the reaction |
| Answer» B. The equilibrium constant of a reaction depends upon temperature only | |
| 156. |
Pick out the undesirable property for a good refrigerant ? |
| A. | High thermal conductivity |
| B. | Low freezing point |
| C. | Large latent heat of vaporisation |
| D. | High viscosity |
| Answer» E. | |
| 157. |
Pick out the correct equation relating ‘F’ and ‘A’___________________? |
| A. | F = A + PV |
| B. | F = E + A |
| C. | F = A – TS |
| D. | F = A + TS |
| Answer» B. F = E + A | |
| 158. |
Pick out the Clausius-Clapeyron equation from the following? |
| A. | dP/dT = ΔH/TΔV |
| B. | ln P = – (ΔH/RT) + constant |
| C. | ΔF = ΔH + T [∂(ΔF)/∂T]P |
| D. | None of these |
| Answer» C. ΔF = ΔH + T [∂(ΔF)/∂T]P | |
| 159. |
Partial molar free energy of an element A in solution is same as its__________________? |
| A. | Chemical potential |
| B. | Activity |
| C. | Fugacity |
| D. | Activity co-efficient |
| Answer» B. Activity | |
| 160. |
Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance) ? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapour compression cycle |
| D. | Vapour compression with a reversible expansion engine |
| Answer» B. Carnot cycle | |
| 161. |
One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one ________________? |
| A. | Hour |
| B. | Day |
| C. | Minute |
| D. | Second |
| Answer» C. Minute | |
| 162. |
One ton of refrigeration capacity is equivalent to the heat removal rate of____________________? |
| A. | 50 kcal/hr |
| B. | 200 BTU/hr |
| C. | 200 BTU/minute |
| D. | 200 BTU/day |
| Answer» D. 200 BTU/day | |
| 163. |
One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is_________________? |
| A. | 30554 |
| B. | 10373 |
| C. | 4988.4 |
| D. | 4364.9 |
| Answer» C. 4988.4 | |
| 164. |
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________? |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Increase in summer and will decrease in winter |
| Answer» B. Decrease | |
| 165. |
On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) ? |
| A. | (∂P/∂V)S = (∂P/∂V)T |
| B. | (∂P/∂V)S = [(∂P/∂V)T]Y |
| C. | (∂P/∂V)S = y(∂P/∂V)T |
| D. | (∂P/∂V)S = 1/y(∂P/∂V)T |
| Answer» D. (∂P/∂V)S = 1/y(∂P/∂V)T | |
| 166. |
Number of phases in a colloidal system is_____________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 167. |
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________? |
| A. | 2 |
| B. | 0 |
| C. | 1 |
| D. | 3 |
| Answer» B. 0 | |
| 168. |
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 | |
| 169. |
Normal temperature and pressure (N.T.P.) corresponds to ___________________? |
| A. | 0°C and 760 mm Hg |
| B. | 15°C and 760 mm Hg |
| C. | 20°C and 760 mm Hg |
| D. | 0°C and 1 kgf/cm2 |
| Answer» D. 0°C and 1 kgf/cm2 | |
| 170. |
No work is done by the system, when a reaction occurs at constant__________________? |
| A. | Volume |
| B. | Temperature |
| C. | Pressure |
| D. | None of these |
| Answer» B. Temperature | |
| 171. |
Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas? |
| A. | Less than |
| B. | Same as |
| C. | More than |
| D. | Half |
| Answer» B. Same as | |
| 172. |
Mollier diagram is a plot of___________________? |
| A. | Temperature vs. enthalpy |
| B. | Temperature vs. enthalpy |
| C. | Entropy vs. enthalpy |
| D. | Temperature vs. internal energy |
| Answer» D. Temperature vs. internal energy | |
| 173. |
Mollier chart is a _____________ plot? |
| A. | Pressure vs. enthalpy |
| B. | Pressure vs. volume |
| C. | Enthalpy vs. entropy |
| D. | Temperature vs. entropy |
| Answer» D. Temperature vs. entropy | |
| 174. |
Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K___________________? |
| A. | 0 |
| B. | ∞ |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 175. |
Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is__________________? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 176. |
Melting of wax is accompanied with ______________ in entropy? |
| A. | Increase |
| B. | Decrease |
| C. | No change |
| D. | None of these |
| Answer» B. Decrease | |
| 177. |
Melting of ice is an example of an _____________ process? |
| A. | Adiabatic |
| B. | Isothermal |
| C. | Isometric |
| D. | None of these |
| Answer» C. Isometric | |
| 178. |
Melting of ice exemplifies a/an______________________? |
| A. | Adiabatic process |
| B. | Endothermic reaction |
| C. | Exothermic reaction |
| D. | Process involving a chemical reaction |
| Answer» C. Exothermic reaction | |
| 179. |
Measurement of thermodynamic property of temperature is facilitated by ____________ law of thermodynamics? |
| A. | 1st |
| B. | Zeroth |
| C. | 3rd |
| D. | None of these |
| Answer» C. 3rd | |
| 180. |
Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________? |
| A. | (∂T/∂V)S, ni = -(∂P/∂S)V, ni |
| B. | (∂S/∂P)T, ni = (∂V/∂T)P, ni |
| C. | (∂S/∂V)T, ni = (∂P/∂T)V, ni |
| D. | (∂T/∂P)S, ni = (∂V/∂S)P, ni |
| Answer» E. | |
| 181. |
Maximum work that could be secured by expanding the gas over a given pressure range is the _____________ work? |
| A. | Isothermal |
| B. | Adiabatic |
| C. | Isentropic |
| D. | None of these |
| Answer» B. Adiabatic | |
| 182. |
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________? |
| A. | Increased COP |
| B. | Same COP |
| C. | Decreased COP |
| D. | Increased or decreased COP; depending upon the type of refrigerant |
| Answer» B. Same COP | |
| 183. |
Linde gas liquefaction process employs cooling ____________________? |
| A. | By throttling |
| B. | By expansion in an engine |
| C. | At constant pressure |
| D. | None of these |
| Answer» B. By expansion in an engine | |
| 184. |
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 | |
| 185. |
_____________ law of thermodynamics ascertains the direction of a particular spontaneous process? |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 186. |
“Law of corresponding states” says that___________________? |
| A. | Two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same |
| B. | The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature |
| C. | No gas can be liquefied above the critical temperature, howsoever high the pressure may be. |
| D. | The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories) |
| Answer» B. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature | |
| 187. |
Kopp’s rule is used to calculate the heat capacity of___________________? |
| A. | Solids |
| B. | Liquids |
| C. | Gases |
| D. | All (A), B. & (C) |
| Answer» B. Liquids | |
| 188. |
Joule-Thomson experiment is__________________? |
| A. | Isobaric |
| B. | Adiabatic |
| C. | Isenthalpic |
| D. | Both B. & C. |
| Answer» E. | |
| 189. |
Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________? |
| A. | 0 |
| B. | ∞ |
| C. | +ve |
| D. | -ve |
| Answer» B. ∞ | |
| 190. |
Joule-Thomson effect i.e., a throttling process is a constant _____________ process? |
| A. | Entropy |
| B. | Temperature |
| C. | Internal energy |
| D. | Enthalpy |
| Answer» E. | |
| 191. |
Joule-Thomson co-efficient is defined as__________________? |
| A. | μ = (∂P/∂T)H |
| B. | μ = (∂T/∂P)H |
| C. | μ = (∂E/∂T)H |
| D. | μ = (∂E/∂P)H |
| Answer» C. μ = (∂E/∂T)H | |
| 192. |
Joule-Thomson co-efficient for a perfect gas is_____________________? |
| A. | Zero |
| B. | Positive |
| C. | Negative |
| D. | None of these |
| Answer» B. Positive | |
| 193. |
Joule-Thomson co-efficient depends on the_____________________? |
| A. | Pressure |
| B. | Temperature |
| C. | Both A. & B |
| D. | Neither A. nor B |
| Answer» D. Neither A. nor B | |
| 194. |
Joule-Thomson Co-efficient at any point on the inversion curve is___________________? |
| A. | ∞ |
| B. | +ve |
| C. | 0 |
| D. | -ve |
| Answer» D. -ve | |
| 195. |
Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a __________________? |
| A. | Straight line |
| B. | Sine curve |
| C. | Parabola |
| D. | Hyperbola |
| Answer» B. Sine curve | |
| 196. |
Isobaric process means a constant process ? |
| A. | Temperature |
| B. | Pressure |
| C. | Volume |
| D. | Entropy |
| Answer» C. Volume | |
| 197. |
Isentropic process means a constant _____________________ process ? |
| A. | Enthalpy |
| B. | Pressure |
| C. | Entropy |
| D. | None of these |
| Answer» D. None of these | |
| 198. |
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 cannot 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 cannot bring out such a change of state | |
| 199. |
Internal energy of an element at 1 atm and 25° C is ____________ kcal/kg.mole? |
| A. | 0 |
| B. | 273 |
| C. | 273 |
| D. | None of these |
| Answer» B. 273 | |
| 200. |
Internal energy of an ideal gas___________________? |
| A. | Increases with increase in pressure |
| B. | Decreases with increase in temperature |
| C. | Is independent of temperature |
| D. | None of these |
| Answer» E. | |