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Mechanical Engineering Objective Questions { Power Plant Engineering }



22. On Millier chart, the constant pressure lines
A.Diverge from left to right
B.Diverge from right to left
C.Are equally spaced throughout
D.First rise up and then fall

23. 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

24. The bituminous coal is non-caking if its carbon content is
A.78-81%
B.81-85%
C.85-90%
D.90-95%

25. 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

26. Water at pressure of 4 kg/cm2 and 160C temperature when exposed to atmosphere will
A.Boil
B.Flash i.e. get converted into steam
C.Remain as it was
D.Cool down

27. 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

28. In a throttling process
A.Steam temperature remaisn constant
B.Steam pressure remains constant steam enthalpy remains constant
C.(f) steam entropy remains constant
D.(g) steam volume remains constant.

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