Same
Less
More
None of these
B. Less
Steam pressure exceeds the working pressure
Water level in the boiler becomes too low
Both (A) and (B)
None of the above
40 %
50 %
75 %
90 %
Last superheater or reheater and air preheater
Induced draft fan and forced draft fan
Air preheater and chimney
None of the above
Cumulative heat drop to the isentropic heat drop
Isentropic heat drop to the heat supplied
Total useful heat drop to the total isentropic heat drop
None of the above
Approach temperature should be as low as possible
Handling and maintenance should be easier
Heat transfer area should be optimum
Stack gases should not be cooled to the dew point
Wet
Superheated
Remain dry saturated
Dry
Atmospheric temperature
500-600°C
700-850°C
950-1100°C
21 %
23 %
30 %
40 %
Pressure only
Temperature only
Dryness fraction only
Pressure and dryness fraction
Decrease dryness fraction of steam
Decrease specific volume of steam
Increase the entropy
Increase the heat drop
Unburnt carbon in ash
Incomplete combustion
Ash content
Flue gases
Locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Lancashire boiler
Babcock and Wilcox boiler
Locomotive boiler
Cochran boiler
Water level indicator
Pressure gauge
Safety valve
All of these
Condenser efficiency
Nozzle efficiency
Boiler efficiency
Vacuum efficiency
Horizontal
Vertical
Inclined
Both horizontal and vertical
The expansion of steam in a nozzle follows Rankine cycle.
The friction in the nozzle increases the dryness fraction of steam.
The pressure of steam at throat is called critical pressure.
All of the above
Blades are equiangular
Blade velocity coefficient is unity
Blades are equiangular and frictionless
Blade solidity is 0.65
Indicated power
Brake power
Frictional power
None of these
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace
Water is converted into steam in one pass without any recirculation
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place
None of these
Has no effect on
Decreases
Increases
None of these
Decreasing initial steam pressure and temperature
Increasing exhaust pressure
Decreasing exhausts pressure
Increasing the expansion ratio
0.1 to 0.2 kg
0.2 to 0.4 kg
0.6 to 0.8 kg
1.0 to 1.5 kg
0.18 MN/m²
1.8 MN/m²
18 MN/m²
180 MN/m²
Steam jet
Centrifugal fan
Chimney
Both (A) and (B)
Anthracite coal
Bituminous coal
Lignite
Peat
Better burning
More calorific value
Less radiation loss
Medium sized units
2 to 4.5 m
3 to 5 m
5 to 7.5 m
7 to 9 m
The content of sulphur
The content of ash and heating value
The proximate analysis
The exact analysis