1. Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process.

2. Charles’ law for gases states that

3. Boyle’s law for gases states that

4. Which of the following is not an intensive property?

5. Pick out the wrong statement.

6. What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope?

7. What is the degree of freedom for two mis-cible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?

8. At __________ point, all the three phases (i.e.solid, liquid and gas) co-exist.

9. Critical compressibility factor for all substances

10. One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one

11. Enthalpy changes over a constant pressure path are always zero for __________ gas.

12. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the

13. The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are

14. In polytropic process (PVn = constant), if n = 1; it means a/an __________ process.

15. Mollier diagram is a plot of

16. In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

17. Melting of ice is an example of an __________ process.

18. Claude’s liquefaction process employs the cooling of gases by

19. A domestic refrigerator has a/an __________ cooled condenser.

20. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

21. At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.

22. PVy = constant, holds good for an isentropic process, which is

23. The internal energy of an ideal gas is a function of its __________ only.

24. Gibbs free energy at constant pressure and temperature under equilibrium conditions is

25. Free energy change at equilibrium is

26. In jet refrigerators, the refrigerating fluid is practically always

27. In the reaction; N₂ + O₂ ⇋ 2NO, increasing the pressure will result in

28. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is

29. Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.

30. For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.

31. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is

32. One ton of refrigeration capacity is equivalent to the heat removal rate of

33. Internal energy of an ideal gas

34. In an ideal refrigeration cycle, the change in internal energy of the fluid is

35. In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants )

36. What is the ratio of adiabatic compressibility to isothermal compressibility?

38. What is the value of Joule-Thomson co-efficient for an ideal gas?

39. Which of the following equations is used for the prediction of activity co-efficient from experiments?

40. 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

41. What is the value of ln y (where y = activity co-efficient) for ideal gases?

42. __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

43. Entropy is a measure of the __________ of a system.

44. Entropy, which is a measure of the disorder of a system is

45. Joule-Thomson Co-efficient at any point on the inversion curve is

46. Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas )

47. If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in

48. Joule-Thomson co-efficient depends on the

49. In Joule-Thomson porous plug experiment, the

50. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when

51. Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

52. Pick out the correct statement:

53. For a spontaneous process, free energy

54. A large iceberg melts at the base, but not at the top, because of the reason that

55. High __________ is an undesirable property for a good refrigerant.

56. Pick out the undesirable property for a good refrigerant.

57. 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

58. Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a

59. Choose the condition that must be specified in order to liquify CO₂ (triple point for CO₂ is – 57°C and 5.2 atm).

60. When a system is in equilibrium for all possible processes, the differential or finite change of entropy is

62. In a working refrigerator, the value of COP is always

63. Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?

64. Which is not constant for an ideal gas?

65. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of

66. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of

67. Work done may be calculated by the expression ∫p dA for __________ processes.

68. With increase in temperature, the atomic heat capacities of all solid elements

69. When a gas is subjected to adiabatic expansion, it gets cooled due to

70. Pick out the wrong statement.

71. Generation of heat by friction is an example of a/an __________ change.

72. Rotary lime kiln is an example of a/an __________ system.

73. Sound waves propagation in air exemplifies an __________ process.

74. Which of the following exemplifies an adiabatic process?

75. 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

76. For a multicomponent system, the term chemical potential is equivalent to the

77. 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

78. The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

79. Pick out the extensive property out of the following.

80. Gibbs free energy per mole for a pure substance is equal to the

81. A change in state involving a decrease in entropy can be spontaneous, only if

82. 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

83. The equation, Cp – Cv = R, is true for __________ gas.

84. Duringthe phase transition, __________ changes.

85. The specific heat of saturated water vapour at 100°C is

86. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

87. Efficiency of a Carnot engine working between temperatures T₁ and T₂ (T₁ < T₂) is

88. Co-efficient of performance for a reversed Carnot cycle working between temperatures T₁ and T₂ (T₁ > T₂) is

89. The following heat engine produces power of 100000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is

90. Degress of freedom at triple point will be

91. Refrigeration cycle

92. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as

93. High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

94. Compressibility factor of a gas is

95. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible __________ process.

96. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.

97. In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process.

98. The internal energy of an ideal gas does not change in a reversible __________ process.

99. In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process.

100. Pick out the wrong statement.

101. Pick out the wrong statement.

102. 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.

103. In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process.

104. Which of the following is not correct for a reversible adiabatic process?

105. Requisites of a reversible process is that the

106. Pick out the wrong statement.

107. The kinetic energy of gas molecule is zero at

108. Fugacity and pressure are numerically equal, when the gas is

109. Lenz’s law results from the law of conservation of

110. Entropy change for an irreversible isolated system is

111. What happens in a reversible adiabatic compression?

112. The equation, PV = nRT, is best obeyed by gases at

113. Which one is true for a throttling process?

114. Pick out the wrong statement.

115. Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole . °K

116. With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure

117. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.

118. The temperature at which both liquid and gas phases are identical, is called the __________ point.

119. The variation of heat of reaction with temperature at constant pressure is given by the __________ law.

120. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

121. Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.

122. When a gas is expanded from high pressure region to low pressure region ; temper -ature change occurs. This phenomenon is related to the

123. Fugacity co-efficient of a substance is the ratio of its fugacity to

124. Out of the following refrigeration cycles, which one has maximum COP?

125. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

126. While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

127. Pick out the wrong statement.

128. Internal energy is equal to the heat absorbed in case of a/an __________ process.

129. __________ increases with increase in pressure.

130. A Carnot cycle consists of the following steps :

131. Throttling process is a/an __________ process.

132. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

133. As the time is passing, entropy of the universe

134. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

135. “The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture”. This is

136. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of

137. Which of the following behaves most closely like an ideal gas?

138. 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

139. Gibbs free energy of mixing at constant pressure and temperature is always

140. Heating of water under atmospheric pressure is an __________ process.

141. Partial molar free energy of an element A in solution is same as its

142. The absolute entropy for all crystalline substances at absolute zero temperature is

143. Equilibrium constant decreases as the temperature

144. A solid is transformed into vapour without going to the liquid phase at

145. The number of degrees of freedom at the triple point of water is

146. Specific __________ does not change during phase change at constant temperature and pressure.

147. Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will

148. Which of the following is an extensive property of a system?

149. The expression for entropy change, ΔS = n Cp . ln (T₂/T₁), is valid for the __________ of a substance.

150. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the

151. Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

152. 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

153. The extensive properties are

154. The intensive properties are

155. Which of the following has the least thermal efficiency?

156. When dilute aqueous solutions of two salts are mixed, the process is associated with

157. A system is said to be isopiestic, if there is no __________ change.

158. The third law of thermodynamics states that the

159. Cp of a gas at its critical temperature and pressure

160. Heat of reaction at constant volume is identified with __________ change.

161. Change of state namely evaportation condensation, freezing and melting is an __________ process.

162. The most important application of distribution law is in

163. The energy of activation of exothermic reaction is

164. The equation Tds = dE – PdV applies to

165. In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respetively, the Carnot COP will be

166. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is

167. The gas law (PV = RT) is true for an __________ change.

168. If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.

169. At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is

170. Free energy change of mixing two liquid substances is a function of the

171. For an ideal solution, the value of activity co-efficient is

172. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.

173. A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

174. During Joule-Thomson expansion of gases

175. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

176. Pick out the wrong statement.

177. As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches

178. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is

179. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

180. 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

181. 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

182. 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

183. Pick out the wrong statement.

184. For the gaseous phase chemical reaction, C₂H₄(g) + H₂O(g) ⟷ C₂H₅OH(g), the equilibrium conversion does not depend on the

185. For an irreversible process involving only pressure-volume work

187. In an ideal solution, the activity of a component equals its

188. Water on heating from 1 to 4°C

189. Work done in an adiabatic process between two states depends on the

190. Which is a state function?

191. Pick out the wrong statement.

192. Which is not a refrigerant?

193. Work done is a

194. For a constant pressure reversible process, the enthalpy change (ΔH) of the system is

195. In an ideal gas mixture, fugacity of a species is equal to its

196. At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is

197. Clayperon equation deals with the

198. Pick out the wrong statement:

199. Degree of freedom of the system ice-water-vapour will be

200. Absolute zero temperature signifies the

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