Steam Nozzle - Steam Nozzle objective type questions and answers


21. The difference of supersaturated temperature and saturation temperature at that pressure is known as .......


   A.Degree of supersaturation

   B.Degree of superheat

   C.Degree of undercooling

   D.None of these


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C.Degree of undercooling

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22. For a convergent divergent nozzle,critical pressure ratio occurs when .......


   A.Velocity at exit becomes sonic

   B.Shock wave of occurs

   C. Nozzle efficiency is maximum

   D.Increase in exit and inlet pressure ratio does not increase steam flow rate


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D.Increase in exit and inlet pressure ratio does not increase steam flow rate

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23. For a convergent divergent nozzle, the mass flow rate remains constant if the ratio of exit and inlet pressures.........


   A.Is less then critical pressure ratio

   B.Is equal to the critical pressure ratio

   C.Is more then critical pressure ratio

   C.Is infinity


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C.Is more then critical pressure ratio

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24. Mack number is more than unity in the following portion of a convergent divergent nozzle......


   A.Convergent potion

   B.Straight portion

   C.Throat

   D.Divergent potion


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D.Divergent potion

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25. If a flow is to be continuously accelerated from a subsonic to a supersonic velocity in nozzle,it must .......


   A.Be convergent

   B.Be divergent

   C.Have throat

   D.Have first divergent section and then convergent section


✔ View Answer


C.Have throat

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