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
A. 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
Atmospheric temperature
500-600°C
700-850°C
950-1100°C
Lancashire boiler
Locomotive boiler
Babcock and Wilcox boiler
Benson boiler
Chimney
Induced draft fan
Both combined (A) and (B)
Steam jet draught
Vb = 0.5 V cosα
Vb = V cosα
Vb = 0.5 V² cosα
Vb = V² cosα
Horizontal
Vertical
Inclined
None of these
Simple impulse turbine
Simple reaction turbine
Impulse-reaction turbine
None of these
Same
Less
More
None of these
Mean diameter and thickness
Inside diameter and thickness
Outside diameter and thickness
Outside diameter and inside diameter
High burning rate is possible
Heat release can be easily controlled
Fuel burns economically
It is the best technique for burning high ash content fuel having low fusion ash
Higher value
Lower value
Same value
Any value
137 fire tubes and 44 superheated tubes
147 fire tubes and 34 superheated tubes
157 fire tubes and 24 superheated tubes
167 fire tubes and 14 superheated tubes
Tonnes/hr. of steam
Pressure of steam in kg/cm²
Temperature of steam in °C
All of the above
More
Less
Equal
None of these
Higher effectiveness of boiler
High calorific value coal being burnt
Fouling of heat transfer surfaces
Raising of steam temperature
Blow off cock
Stop valve
Superheater
None of these
Cut-off ratio
Expansion ratio
Clearance ratio
None of these
Work done during the Rankine cycle
Work done during compression
Work done during adiabatic expansion
Change in enthalpy
4.75 mm
5.47 mm
7.45 mm
47.5 mm
Only moving blades
Only fixed blades
Identical fixed and moving blades
Fixed and moving blades of different shape
One-half the height of chimney
Equal to the height of chimney
Two times the height of chimney
Four times the height of chimney
Constant volume flow
Constant pressure flow
Isothermal flow
Isentropic flow
30 MW
60 MW
100 MW
500 MW
Pressure only
Temperature only
Dryness fraction only
Pressure and dryness fraction
Reheating of steam
Regenerative feed heating
Binary vapour plant
Any one of these
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
Ash
Volatile matter
Moisture
Hydrogen
Cavitation of boiler feed pumps
Corrosion caused by oxygen
Heat transfer coefficient
pH value of water
Increases
Decreases
Remain same
None of these
Boil
Flash i.e. get converted into steam
Remain as it was
Cool down
2 to 4.5 m
3 to 5 m
5 to 7.5 m
7 to 9 m