Linearly
Rapidly first and then slowly
Slowly first and then rapidly
Inversely
B. Rapidly first and then slowly
More
Less
Equal
May be more or less depending on capacity of reheater
Surface condenser
Jet condenser
Barometric condenser
Evaporative condenser
Wet steam
Saturated steam
Superheated steam
Cushion steam
100 bar
150 bar
200 bar
250 bar
All the fuel burns instantaneously producing high energy release
Fuel burns with less air
Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Explosion in furnace
Temperature, time, and turbulence
Total air, true fuel, and turbulence
Thorough mixing, total air and temperature
Total air, time, and temperature
Infinitely long
Around 200 meters
Equal to the height of the hot gas column producing draught
Outside temperature is very low
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
Low
Very low
High
Very high
One-fourth
One-third
Two-fifth
One-half
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
Wholly in blades
Wholly in nozzle
Partly in the nozzle and partly in blades
None of these
Steam boiler
Steam turbine
Steam condenser
Steam injector
Give maximum space
Give maximum strength
Withstand pressure inside boiler
Resist intense heat in fire box
In the drum
In the fire tubes
Above steam dome
Over the combustion chamber
Prevent the bulging of flat surfaces
Avoid explosion in furnace
Prevent leakage of hot flue gases
Support furnace freely from top
ηS = ηB × ηN
ηS = ηB / ηN
ηS = ηN / ηB
None of these
180° to each other
90° to each other
0° to each other
None of these
Horizontal
Vertical
Inclined
Horizontal and inclined
More
Equal
Less
Could be more or less depending on the size of plant
No heat drop in moving blades
No heat drop in fixed blades
Maximum heat drop in moving blades
Maximum heat drop in fixed blades
Provide air around burners for obtaining optimum combustion
Transport and dry the coal
Cool the scanners
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone.
Climatic conditions
Temperature of furnace gases
Height of chimney
All of these
Increase thermal efficiency of boiler
Economise on fuel
Extract heat from the exhaust flue gases
Increase flue gas temperature
30 MW
60 MW
100 MW
500 MW
1 m
1.5 m
2 m
2.5 m
12 m
1.52.5 m
23 m
2.53.5 m
Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler
Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler
Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes
Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube
One
Two
Three
Four
0.17 MN/m²
1.7 MN/m²
17 MN/m²
170 MN/m²