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1) On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by_______________? a. horizontal straight line b. vertical straight line c. straight inclined line d. curved line e. none of the above
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2) The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________? a. wet b. superheated c. remain dry satruated d. dry e. none of the above
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3) The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become_______________? a. wet b. superheated c. remain dry saturated d. dry e. none of the above
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4) In a throttling process_________________? a. heat transfer takes place b. work is done by the expanding steam c. internal energy of steam changes d. all of the above e. none of the above
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5) Latent heat of dry steam at atmospneric pressure is equal to____________________? a. 539 kcal/kg b. 539 BTU/lb c. 427 kcal/kg d. 100 kcal/kg e. 471 kcal/kg
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6) At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________? a. maximum b. minimum c. zero d. depends on temperature also e. none of the above
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7) In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________? a. 40% b. 25% c. 50% d. 80% e. 90%
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8) Heating wet steam at constant temperature is heating it at constant_________________? a. volume b. pressure c. entropy d. enthalpy e. none of the above
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9) The state of vapour under saturation condition is described by_______________? a. pressure alone b. temperature alone c. pressure and temperature d. pressure and dryness fraction e. dryness fraction alone
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10) Water boils when its vapour pressure ___________________? a. equals that of the surroundings b. equals 760 mm of mercury c. equals to atmospheric pressure d. equals the pressure of water in the container e. boiling has ^nothing to do with vapour pressure
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11) Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________? a. and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2 b. and its corresponding conversion into dry steam at desired boiler pressure c. conversion into steam at atmospheric condition d. conversion into steam at the same pres-sure at which feed water is supplied e. none of the above
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12) The increase in pressure _________________? a. lowers the boiling point of a liquid b. raises the boiling point of a liquid c. does not affect the boiling point of a liquid d. reduces its volume e. none of the above
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13) Hygrometery deals with the_________________? a. Hygroscopic substances b. water vapour in air c. temperature of air d. pressure of air e. density measurement
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14) Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________? a. C02 b. CO c. 02 d. N2 e. none of the above
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15) Efficiency of rankine cycle can be increased by_________________? a. decreasing initial steam pressure and temperature b. increasing exhaust pressure c. decreasing exhaust pressure d. increasing the expansion ratio e. increasing number of regenerative heaters
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16) Efficiency of a thermal cycle increases by ________________? a. regeneration b. reheating of steam c. both A. and B. d. cooling of steam e. none of the above
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17) Which of the following gases has the highest calorific value ________________? a. producer gas b. coal gas c. water gas d. blast furnace gas e. coke oven gas
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18) For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________? a. 1 kg b. 4/3kg c. 8/3kg d. 2 kg e. 16/3 kg
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19) The lenght of Cornish boiler is of the order of _________________? a. 2-4 m b. 3-5 m c. 5-7.5 m d. 7-9 m e. 9-11 m
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20) Steam engine operates on_________________? a. carnot cycle b. joule cycle c. Stirling cycle d. brayton cycle e. none of the above
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