STEAM BOILERS, ENGINES, NOZZLES AND TURBINE MCQ
Q11. On kcal/kg in S.I. unit is equal to
(a) 427 J/kg
(b) 4.72 J/kg
(c) 4.1868 kJ/kg
(d) 42.7 J/kg.
Q12. Mechanical equivalent ( J) of heat is equal to
(a) 427 J/kcal
(b) 427 kgf-m/kcal
(c) 427 J/kg
(d) 4.1868 kJ/kg.
Q13. The critical point is the point at which
(a) melting and boiling temperature became equal
(b) the change of volume accompanying evaporation is maximum
(c) the change of volume accompanying evaporation is zero
(d) none of the above.
Q14. Sublimation of ice to steam takes place if the pressure is
(a) 225.65 kgf/cm2
(b) 1 kgf/cm2
(c) less than 0.0062 kgf/cm2
(d) 1 kgf/cm2
Q15. At a low pressure
(a) boiling point rises markedly and melting point drops slightly
(b) boiling point rises slightly and melting point drops markedly
(c) boiling point drops markedly and melting point rises slightly
(d) boiling point drops slightly and metaling point rises markedly.
Q16. Dryness fraction of wet steam is given by
(a) ration of mass of dry steam to the mass of suspended liquid water
(b) ratio of mass of suspended liquid water to mass of dry steam
(c) ratio of mass of dry stream to the sum of mass of suspended liquid water and dry steam
(d) ratio of sum of mass of suspended liquid water and dry steam to the mass of dry steam.
Q17. If the mass of dry steam is equal to 10 kg and mass of suspended liquid water is 5 kg in a mixture of wet steam, then dryness fraction is equal to
Q18. Sublimation region is the region where
(a) liquid and vapour phases are in equilibrium
(b) solid and liquid phases are in equilibrium
(c) solid, liquid and vapour phases are in equilibrium
(d) sollid and vapour phases are in equilibrium.
Q19. The equivalent evaporation of boiler is measure to compare
(a) any type of boilers operating under and conditions
(b) the two different boilers of the same make
(c) the given boiler with the model
(d) none of the above.
Q20. The standard cycle for comparing the performance of steam plants is
(a) Carnot cycle
(b) Rankine cycle
(c) Otto cycle
(d) Joule cycle.
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