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Steam boiler engine nozzle turbine
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by horizontal straight line [other wrong options] [Discuss in forum] vertical straight line straight inclined line curved line none of the above. |
Q22 ⇒ The bituminous coal is non-caking if its carbon content is 78-81% [other wrong options] [Discuss in forum] 81-85% 85-90% 90-95% 95-100%. |
Q23 ⇒ The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become superheated [other wrong options] [Discuss in forum] wet remain dry saturated dry none of the above. |
Q24 ⇒ Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will flash i.e. get converted into steam [other wrong options] [Discuss in forum] boil remain as it was cool down none of the above. |
Q25 ⇒ The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become wet [other wrong options] [Discuss in forum] superheated remain dry saturated dry none of the above. |
Q26 ⇒ In a throttling process steam enthalpy remains constant [other wrong options] [Discuss in forum] steam temperature remaisn constant steam pressure remains constant steam entropy remains constant steam volume remains constant. |
Q27 ⇒ In a throttling process none of the above. [other wrong options] [Discuss in forum] heat transfer takes place work is done by the expanding steam internal energy of steam changes all of the above |
Q28 ⇒ The pressure at which latent heat of vaporisation of water is zero, is 225.6 kg/cm2. [other wrong options] [Discuss in forum] below atmospheric pressure 1 kg/cm2 100 kg/cm2 170 kg/cm2 |
Q29 ⇒ Latent heat of dry steam at atmospneric pressure is equal to 539 kcal/kg [other wrong options] [Discuss in forum] 539 BTU/lb 427 kcal/kg 100 kcal/kg 471 kcal/kg. |
Q30 ⇒ The latent heat of steam with increase of pressure decreases [other wrong options] [Discuss in forum] remains same increases behaves unpredictably none of the above. |
Q31 ⇒ At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporization is zero [other wrong options] [Discuss in forum] maximum minimum depends on temperature also none of the above. |
Q32 ⇒ At which pressure the properties of water and steam become identical 225.6 kg/cm2 [other wrong options] [Discuss in forum] 0.1 kg/cm2 1 kg/cm2 100 kg/cm2 it is never possible. |
Q33 ⇒ 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 80% [other wrong options] [Discuss in forum] 40% 25% 50% 90%. |
Q34 ⇒ While steam expands in turbines, theoretically the entropy remains constant [other wrong options] [Discuss in forum] increases decreases behaves unpredictably none of the above. |
Q35 ⇒ Heating wet steam at constant temperature is heating it at constant pressure [other wrong options] [Discuss in forum] volume entropy enthalpy none of the above. |
Q36 ⇒ Adiabatic process is non-heat transfer process [other wrong options] [Discuss in forum] essentially an isentropic process reversible process constant temperature process constant enthalpy process. |
Q37 ⇒ The state of vapour under saturation condition is described by pressure and dryness fraction [other wrong options] [Discuss in forum] pressure alone temperature alone pressure and temperature dryness fraction alone. |
Q38 ⇒ Pick up the wrong statement about critical condition of steam this is the maximum pressure limit [other wrong options] [Discuss in forum] latent heat is zero liquid directly becomes steam specific volume of steam and liquid is same all properties of liquid and steam are same. |
Q39 ⇒ Water boils when its vapour pressure equals that of the surroundings [other wrong options] [Discuss in forum] equals 760 mm of mercury equals to atmospheric pressure equals the pressure of water in the con-tainer boiling has ^nothing to do with vapour pressure. |
Q40 ⇒ Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to 421 kgm [other wrong options] [Discuss in forum] 421 kgm 539 kgm 102 kgm 75 kgm. |
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