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Mechanical Engineering Objective Questions { Power Plant Engineering }



29. In a throttling process
A.Heat transfer takes place
B.None of the above.
C.Internal energy of steam changes
D.All of the above

30. The pressure at which latent heat of vaporisation of water is zero, is
A.Below atmospheric pressure
B.225.6 kg/cm2.
C.100 kg/cm2
D.170 kg/cm2

31. The latent heat of steam with increase of pressure
A.Remains same
B.Increases
C.Decreases
D.Behaves unpredictably

32. 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

33. At which pressure the properties of water and steam become identical
A.0.1 kg/cm2
B.1 kg/cm2
C.100 kg/cm2
D.225.6 kg/cm2

34. 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.0.4
B.0.25
C.0.5
D.0.8

35. While steam expands in turbines, theoretically the entropy
A.Remains constant
B.Increases
C.Decreases
D.(a) 539 kcal/kg

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