1) 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
|
||||
2) Work done in case of free expansion is____________________? a. Indeterminate b. Zero c. Negative d. None of these
|
||||
3) 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
|
||||
4) For an isothermal process, the internal energy of a gas____________________? a. Increases b. Decreases c. Remains unchanged d. Data insufficient, can’t be predicted
|
||||
5) 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
|
||||
6) The standard Gibbs free energy change of a reaction depends on the equilibrium______________________? a. Pressure b. Temperature c. Composition d. All A, B. and C
|
||||
7) The most important application of distribution law is in_____________________? a. Evaporation b. Liquid extraction c. Drying d. Distillation
|
||||
8) Enthalpy changes over a constant pressure path are always zero for ______________ gas? a. Any b. A perfect c. An easily liquefiable d. A real
|
||||
9) Fugacity is most helpful in____________________? a. Representing actual behaviour of real gases b. Representing actual behaviour of ideal gases c. The study of chemical equilibria involving gases at atmospheric pressure d. None of these
|
||||
10) During adiabatic expansion of gas___________________? a. Pressure remains constant b. Pressure is increased c. Temperature remains constant d. None of these
|
||||
11) What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ? a. 0 b. 1 c. 2 d. 3
|
||||
12) 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
|
||||
13) Which of the following non-flow reversible compression processes require maximum work ? a. Adiabatic process b. Isothermal process c. Isobaric process d. All require same work
|
||||
14) 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
|
||||
15) Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ? a. d ln p/dt = Hvap/RT2 b. d ln p/dt = RT2/Hvap c. dp/dt = RT2/Hvap d. dp/dt = Hvap/RT2
|
||||
16) Cp – Cv = R is valid for ______________ gases? a. Ideal b. Very high pressure c. Very low temperature d. All of the above
|
||||
17) 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
|
||||
18) Activity co-efficient is a measure of the____________________? a. Departure from ideal solution behaviour b. Departure of gas phase from ideal gas law c. Vapour pressure of liquid d. None of these
|
||||
19) Fugacity and pressure are numerically equal, when the gas is____________________? a. In standard state b. At high pressure c. At low temperature d. In ideal state
|
||||
20) Third law of thermodynamics is concerned with the__________________? a. Value of absolute entropy b. Energy transfer c. Direction of energy transfer d. None of these
|
||||
21) Clapeyron Equation deals with the____________________? a. Rate of change of vapour pressure with temperature b. Effect of an inert gas on vapour pressure c. Calculation of ΔF for spontaneous phase change d. Temperature dependence of heat of phase transition
|
||||
22) For an ideal gas, the enthalpy__________________? a. Increases with rise in pressure b. Decreases with rise in pressure c. Is independent of pressure d. Is a path function
|
||||
23) Fugacity and pressure are numerically not equal for the gases__________________? a. At low temperature and high pressure b. At standard state c. Both A. and B d. In ideal state
|
||||
24) Work done in an adiabatic process between two states depends on the__________________? a. Rate of heat transmission b. Initial state only c. End states only d. None of these
|
||||
25) Which is an example of closed system ? a. Air compressor b. Liquid cooling system of an automobile c. Boiler d. None of these
|
||||
26) For a reversible process involving only pressure-volume work____________________? a. (dF)T, p 0 b. (dF)T, p = 0 c. (dA)T, v < 0 d. None of these
|
||||
27) Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure? a. Fugacity b. Partial pressure c. Activity co-efficient d. All (A), (B), and (C)
|
||||
28) A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient 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
|
||||
29) 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 numbers of degrees of freedom are ? a. 1 b. 2 c. 3 d. 0
|
||||
30) Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________? a. 300 × (32/7) b. 300 × (33/5) c. 300 × (333/7) d. 300 × (35/7)
|