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Mechanical Engineering Objective Questions { Power Plant Engineering }



15. Sublimation region is the region where
A.Solid and vapour phases are in equilibrium
B.Solid and liquid phases are in equilibrium
C.Liquid and vapour phases are in equilibrium
D.Solid, liquid and vapour phases are in equilibrium

16. Stoichiometric quantity of air is the
A.Air present in atmosphere at NTP conditions
B.Air required for complete combustion of fuel with no excess air
C.Air required for optimum combustion so as to have reasonable excess air
D.Air required to convert CO into CO2

17. One kg of steam sample contains 0.8 kg dry steam: it's dryness fraction is
A.0.2
B.0.8
C.1
D.0.6

18. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
A.Throttling calorimeter
B.Separating calorimeter
C.Combined separating and throttling calorimeter
D.Bucket calorimeter

19. The specific heat of superheated steam in kcal/kg is generally of the order of
A.0.1
B.0.3
C.0.5
D.0.8

20. On Mollier chart, flow through turbine is represented by
A.Horizontal straight line
B.Vertical straight line
C.Straight inclined line
D.Curved line

21. A wet vapour can be completely specified by
A.Pressure only
B.Pressure and dryness fraction.
C.Dryness fraction only
D.Specific volume only

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