Steam Nozzles and Turbines Questions

• The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
• A binary vapour plant consists of
• The Parsons' reaction turbine has
• A turbine is said to have an axial discharge when the steam leaves the blade tip at __________ to the direction of the blade motion.
• The turbine, in which the general direction of the steam flow is parallel to the turbine axis, is called axial flow turbines
• In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2) will be
• The turbine blades do not change the direction of steam issuing from the nozzle.
• The ratio of total useful heat drop to the total isentropic heat drop, is called
• In a nozzle, whole frictional loss is assumed to occur between
• The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity (V) at inlet)
• Thermal equilibrium means that the flow of steam is
• The variation of steam pressure in the nozzle depends upon
• The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
• A regenerative steam cycle renders
• The ratio of the useful heat drop to the isentropic heat drop is called
• The critical pressure ratio (p2/p1) is given by
• The flow through a nozzle is regarded as
• The ratio of the workdone on the blades to the energy supplied to the blades, is called
• The turbine blades are
• The impulse reaction turbine has its driving force