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WorksheetsSteam Nozzle
Total questions: 15
Worksheet time: 12mins
Nozzle is duct of varying cross-sectional area, in which pressure energy of fluid is converted into
Mechanical Energy
Hydraulic Energy
Kinetic Energy
Some other forms of enegy
Critical pressure ratio for dry saturated steam
0.546
0.577
0.585
0.564
The critical Pressure ratio for super-heated steam
0.577
0.546
0.537
0.584
Critical pressure means pressure of steam at
throat
inlet
exit
inside the nozzle
Velocity of steam at throat corresponds to maximum discharge condition
minimum velocity
critical velocity
average velocity
mean velocity
Existence of fluid in super-heated state in wet region
Metastable
Supersaturated
superheated
moisturised
Difference between saturation temperature and temperature of supersaturated vapour
Degree of supersaturation
Degree of super-cooling
Degree of sub-cooling
Degree of sub-saturation
Degree of super-saturation
Ratio of the saturation pressure corresponding to temperature of steam condensate to actual pressure
Ratio of actual pressure to the saturation pressure corresponding to temperature of steam condensate
Ratio of actual pressure to the saturation pressure corresponding to temperature of steam evaporate
Ratio of the saturation pressure corresponding to temperature of steam evaporate to actual pressure
Nozzle efficiency is
ratio of isentropic enthalpy drop to actual enthalpy drop
ratio of actual enthalpy drop to actual isentropic enthalpy drop
ratio of isentropic enthalpy drop to saturation temperature
ratio of actual enthalpy drop to saturation temperature
Effect of friction in a nozzle
Reduction in enthalpy drop and exit velocity
Reheating of fluid
Increase in specific volume
Decrease in mass flow rate
Effect of supersaturation flow
Actual heat drop is slightly reduced
exit velocity is slightly increased
specific volume is increased
mass flow rate and entropy is decreased
Steam nozzle concept is
Very difficult to understand
Moderate
Easy to understand
Having lot of doubt
Are you familiar to make use of steam table and Mollier diagram?
Yes, I can able to refer both
I can able to refer steam table but no idea to refer Mollier diagram
I can able to refer Mollier diagram but no idea to refer steam table
No, Both are difficult to me
Nozzle velocity coefficient
velocity at the nozzle exit with isentropic flow and same exit pressure / Actual velocity at the nozzle exit
Actual velocity at the nozzle exit / Critical Velocity
Actual velocity at the nozzle exit / velocity at the nozzle exit with isentropic flow and same exit pressure
Critical Velocity / Actual velocity at the nozzle exit
Coefficient of Discharge
Actual mass flow rate / mass flow rate with isentropic flow
mass flow rate with isentropic flow /Actual mass flow rate
Actual mass flow rate / minimum mass flow rate
Minimum mass flow rate / Actual mass flow rate
