Steam Nozzles and Turbines Questions

• The critical pressure ratio for initially dry saturated steam is
• The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.
• The process of maintaining the speed of the turbine constant for various load conditions, is known as
• The maximum discharge of steam through a convergent-divergent nozzle depends upon
• The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.
• The ratio of the energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam is called mechanical efficiency.
• The pressure of steam at throat of a steam nozzle is called critical pressure.
• The friction in the nozzle __________ exit velocity of steam.
• The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
• The pressure of steam __________ while flowing through a nozzle.
• In a single stage impulse turbine, the velocity of steam approaching nozzles is negligible.
• When the cross-section of a nozzle first increases from its entrance to throat, and then decreases from its throat to exit, it is not a convergent-divergent nozzle.
• A stage, in reaction turbine, is represented by
• A nozzle is said to be a divergent nozzle
• The ratio of the isentropic heat drop to the heat supplied, is called
• Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?
• For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion.
• The effect of friction on the flow of steam through a nozzle is to
• The effect of supersaturation is that the
• De-Laval turbine is a