77. Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?
78. The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure.
79. 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
80. The diagram efficiency is the ratio of
81. The Rankine efficiency depends upon total useful heat drop and total isentropic heat drop.
82. Blading efficiency is also known as
83. The pressure of steam, in reaction turbines, is reduced in the fixed blades as well as in moving blades.
84. In order to reduce the rotor speed of an impulse turbine, the method employed is
85. The nozzle efficiency is the ratio of
86. The friction in the nozzle __________ exit velocity of steam.
87. In a reaction turbine
88. A stage, in reaction turbine, is represented by
89. When the nozzle operates with the maximum mass flow, the nozzle is said to be
90. In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
91. 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.
92. A steam nozzle converts
93. The maximum discharge of steam through a convergent-divergent nozzle depends upon
94. Steam turbines may be classified according to
95. The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
96. In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be
97. In an impulse turbine, steam expands
98. In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.
99. In a nozzle, the effect of supersaturation is to
100. The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.