Steam Nozzles and Turbines Questions

• The stage efficiency is the ratio of energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam.
• The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
• When the inlet pressure of steam is equal to the exit pressure, then
• In an impulse reaction turbine, the pressure drops gradually and continuously over
• The expansion of steam, as it flows over the blades in reaction turbine, represents
• In pressure compounding of an impulse turbine, the total pressure drop of the steam does not take place in the first nozzle ring, but is divided equally among all the nozzle rings.
• The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
• An impulse turbine as compared to a reaction turbine, for a given power has __________ row of blades.
• The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
• The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.
• The velocity of whirl at outlet for an axial discharge turbine is
• In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is __________ the relative velocity of steam at inlet tip of the blade.
• The friction present between the steam and the nozzle surfaces reduces the heat drop by
• In a reaction turbine when the degree of reaction is zero, then there is
• Degree of reaction is defined as the ratio of
• The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)
• A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
• The critical pressure ratio is given by (where p1 = Initial pressure of steam, and p2 = Pressure of steam at throat or critical pressure)
• The effect of friction in the nozzle __________ dryness fraction of steam.
• In a reaction turbine, when steam flows through the moving blades,