Steam Nozzles and Turbines Questions

• The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
• Steam turbines are used for
• De-Laval turbine is a
• The steam leaves the nozzle at a
• Parson's turbine is a
• In a convergent divergent nozzle, the discharge depends upon the initial conditions of steam and the area of nozzle at throat.
• The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
• When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
• A nozzle is said to be a convergent nozzle
• The critical pressure ratio for initially dry saturated steam is more as compared to initially wet steam.
• In a reaction turbine
• The critical pressure ratio for gases is
• The velocity of steam at throat of the nozzle is __________ the velocity of sound.
• The reheat factor depends upon
• The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called
• The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.
• A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be
• In an impulse turbine
• The compounding of turbines is done in order to
• The efficiency ratio is the ratio of total useful heat drop to the total isentropic heat drop.