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Steam Nozzles and Turbines
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A binary vapour plant consists of
mercury boiler
All of These
steam condenser
Steam turbine
The purpose of governing in steam turbines is to
maintain the speed of the turbine
reduce the effective heat drop
reheat the steam and improve its quality
completely balance against end thrust
In a nozzle, the effect of supersaturation is to
decrease dryness fraction of steam
increase the heat drop
decrease specific volume of steam
increase the entropy
A regenerative steam cycle renders
decreased work output per unit mass of steam as well as increased thermal efficiency
increased work output per unit mass of steam
decreased work output per unit mass of steam
increased thermal efficiency
The value of the reheat factor varies from
1.08 to 1.l0
1.2 to 1.6
1.6 to 2
1.02 to 1.06
Reheating of steam in a turbine
reduces wear on the blades
All of These
increases the efficiency of the turbine
increases the workdone through the turbine
Thermal equilibrium means that the flow of steam is
polytropic
Hyperbolic
Isothermal
isentropic
The reheat factor depends upon
turbine stage efficiency
All of These
initial pressure and superheat
exit pressure
The effect of supersaturation is that the
All of These
exit velocity of steam reduces
entropy and specific volume of the steam increases
mass of the steam discharged increases
The expansion of steam in a nozzle follows
Joule cycle
Rankine cycle
Stirling cycle
Carnot cycle
Parson's reaction turbine is a __________ reaction turbine
40 percent
60 percent
70 percent
50 percent
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of aturbine.
The degree of reaction will be
0.56
1.67
0.4
0.67
The density of supersaturated steam is about __________ that of the ordinary saturated vapour at the corresponding pressure
8 times
2 times
4 times
same as
A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as
pass out turbine
low pressure turbine
impulse turbine
back pressure turbine
The Parsons' reaction turbine has
only moving blades
fixed and moving blades of different shape
only fixed blades
identical fixed and moving blades
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
velocity remains constant
velocity decreases
pressure remains constant
velocity increases
The critical pressure ratio for initially dry saturated steam is
0.582
0.577
0.546
0.601
The efficiency of steam turbines may be improved by
any one of these
binary vapour plant
regenerative feed heating
reheating of steam
In an ideal impulse turbine, the
relative velocity at the inlet of the moving blade is equal to that at the outlet
absolute velocity at the inlet of moving blade is equal to that at the outlet
axial velocity at inlet is equal to that at the outlet
whirl velocity at inlet is equalto that at the outlet
The action of steam in a steam turbine is
static and dynamic
static
neither static nor dynamic
Dynamic
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