Steam Nozzles and Turbines Questions

• The action of steam in a steam turbine is
• The reheat factor is the ratio of the
• The value of the reheat factor varies from
• In a reaction turbine, when steam flows through the fixed blades,
• The discharge is __________ at critical pressure.
• The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)
• The steam enters the nozzle at a
• Which of the following statement is correct?
• In reaction turbines, the axial thrust is due to
• The blade velocity coefficient is ratio of relative velocity of steam at outlet tip of the blade to the relative velocity of steam at inlet tip of the blade.
• Parson's reaction turbine is a __________ reaction turbine.
• The efficiency of steam turbines may be improved by
• The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)
• The pressure at which the steam leaves the nozzle is known as back pressure.
• The difference of supersaturated temperature and saturation temperature at that pressure is called
• The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
• The critical pressure gives the velocity of steam at the throat
• The critical pressure ratio for initially wet steam is
• Multi-stage steam turbines are of the
• The maximum efficiency of a reaction turbine is