Steam Nozzle - Steam Nozzle objective type questions and answers

16. A nozzle is said to be choked when .......

   A.Flow-through it is zero

   B.Flow is attained at maximum value corresponding to critical exit pressure

   C.It is not possible to increase the flow by increasing inlet pressure

   D.It is discharging into atmosphere

17. In a nozzle,the effect of supersaturation is to.......

   A.Decrease the dryness fraction of steam

   B.Decreases the specific volume of steam

   C.Increase the entropy

   D.Increase the enthalpy drop

18. That density of super saturated steam is about.........that of the ordinary saturated vapour at the corresponding pressure

   A.Same as

   B.2 times

   C.4 times

   C.8times

19. The superposition of steam results in slight......

   A.Increase in entropy

   B.Increase of final dryness fraction

   C.Increase of discharge

   D.Increase of density

   E.All the above

20. For critical pressure ratio, the discharge through a nozzle is.......

   A.Maximum

   B.Minimum

   C.Zero

   D.Some value between maximum and minimum

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