University of Baghdad Date 22/6/2017 (1st Attempt) Time: 3 hrs 28. One of consta

Question

University of Baghdad Date 22/6/2017 (1st Attempt) Time: 3 hrs 28. One of constant enthalpy process of a perfect gas is the adiabatic throtting process Ab (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. 29. A a), pressure vs enthalpy (b). pressure vs volume ( c). enthalpy vs entropy(d). temperature vs entropy 30 The effect of changing the evaporator temperature on COP as compared to that of changing the plot is called the Mollier chart. condenser temperature (in vapour compression refrigeration system) is (a). less pronounced (b). more pronounced (e) equal (d). data insufficient, can't be predicted. 31. The of each component must be same in all phases, for multicomponent multiple phases to in equilibrium at the same pressure and temperature. (a) c ential (b) fugacity)boa) and (b)) neither (a) nor (b). 32. At constant temperature and pressure, the relation connecting the fugacities of various components in a solution with one another and to composition is called the (b). Van Laar. equation (a). Gibbs-Duhem. (c). Gibbs-Helmholtz. (d). Margules 33. The temperature of the room will closed room. on opening the door of an operating refrigerator kept in a (a). increase s(b) decrease (c). remain same (d). increase in summer and will decrease in winter. 34. A Carnot cycle consists of the following steps: (a). Two isothermals and two isentropics. (b). Two isobarics and two isothermals. (c). Two isochorics and two isobarics. (d). Two isothermals and two isochorics. 35. Gamma alumina is activated by calcination and dehydration the hydrous oxide gives a surface containing (a) Electron acceptor (b) Basic sites (c) Bronsted sites (d) Lewis and basic sites 36. Best results occur when the... of the support surface enter into precipitation reaction for active component deposition. (a) Hydroxyl group (b) Alkyl group re) alkoxy group (d) carboayl-group 37. Xerogel is a material lost about....of moisture content during drying. (a) 25% (b) 50% (c) 100% (d) 10% Paee 4 of 6

Explanation / Answer

28- (c) one of constant enthalpy of perfect gas adiabatic process is Which can be performed with pipe with constriction, As like in case of orifice meter , ventury meter fluid pass throgh constriction enthalpy remain constant

29- (c)H-S diagram ( Enthalpy -entropy diagram ) is known as Mollier diagram

30- (b) COP = TC/(TH -TC) where TC is evaporator temperature, and TH is condenser temperature, Evaportor temperature appear at two places so it has more pronounced

31- (c) The chemical potential and fugacity (option c) must be same in all phases for multicomponent multiphase to be in equilibrium at constant T and P

32- (a) Gibbs Duhem equation gives the relation connecting the fugacities of various component in solution with one and other GE/RT = sum Xi ln Vi, where Ge excess gibbs energy , T = temperature, Xi mole fraction of component i, Vi is fugacity of component i

According to chegg policy only 4 parts are allowed

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