Internally fired boiler
Externally fired boiler
Natural circulation boiler
Forced circulation boiler
Reduce hardness and for removal of solids
Increase efficiency of thermal power plant
Increase heat transfer rate
Increase steam parameters
0.1 to 0.2 kg
0.2 to 0.4 kg
0.6 to 0.8 kg
1.0 to 1.5 kg
Remain same
Increases
Decreases
Behaves unpredictably
It has heating value
It helps in electrostatic precipitation of ash in flue gases
It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
It erodes furnace walls
47.5 mm, 130 mm
32.5 mm, 180 mm
65.5 mm, 210 mm
24.5 mm, 65 mm
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Brake thermal efficiency
200-400 kcal/ kg
800-1200 kcal/ kg
2000-4000 kcal/ kg
5000-8000 kcal/ kg
Anthracite coal
Bituminous coal
Lignite
Peat
Constant volume
Constant temperature
Constant pressure
Constant entropy
Remains constant
Increases
Decreases
Behaves unpredictably
One
Two
Three
Four
Economiser
Superheater
Both (A) and (B)
None of these
A horizontal steam engine requires less floor area than a vertical steam engine
The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure
The compound steam engines are generally non-condensing steam engines
All of the above
Same
More
Less
Less or more depending on size of boiler
Pressure alone
Temperature alone
Pressure and temperature
Pressure and dryness fraction
In the drum
In the fire tubes
Above steam dome
Over the combustion chamber
Same as
2 times
4 times
8 times
373°K
273.16°K
303°K
0°K
Chimney
Induced draft fan
Both combined (A) and (B)
Steam jet draught
Receiver type compound engine
Tandem type compound engine
Woolf type compound engine
Both (A) and (B)
Surface condenser
Jet condenser
Barometric condenser
Evaporative condenser
High calorific value
Produce minimum smoke and gases
Ease in storing
High ignition point
Enthalpy
Superheating
Super saturation
Latent heat
Back pressure turbine
Pass out turbine
Low pressure turbine
Impulse turbine
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing
Heat is transferred by bleeding some gas from furnace
kg of steam produced
Steam pressure produced
kg of fuel fired
kg of steam produced per kg of fuel fifed
40 %
50 %
75 %
90 %
Coking coal
Non-coking or free burning coal
Pulverised coal
High sulphur coal
Equal to
Less than
Greater than
None of these