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
C. 157 fire tubes and 24 superheated tubes
Barometric pressure + actual pressure
Barometric pressure - actual pressure
Gauge pressure + atmospheric pressure
Gauge pressure - atmospheric pressure
150 kg/h
210 kg/h
280 kg/h
340 kg/h
Heat transfer takes place across cylinder walls
Work is done
Steam may be wet, dry or superheated after expansion
All of the above
Reheat factor
Stage efficiency
Internal efficiency
Rankine efficiency
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
1 m
1.5 m
2 m
2.5 m
Corroding air heaters
Spontaneous combustion during coal storage
Facilitating ash precipitation
All of the above
3.3 bar
5.46 bar
8.2 bar
9.9 bar
Non-coking bituminous coal
Brown coal
Peat
None of the above
Straight
Circular
Curved
None of these
0.1 kg/cm²
1 kg/cm²
100 kg/cm²
225.6 kg/cm²
Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Forced circulation takes place
Tubes are laid vertically
1.5 to 2 m
2.5 to 3.5 m
3.5 to 4.5 m
None of these
Producer gas
Coal gas
Water gas
Blast furnace gas
p₁. p₂
p₁/p₂
p₂/p₁
p₁ + p₂
Pulverising coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Binding the pulverised coal into briquettes
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 gases from furnace
Locomotive boiler
Cochran boiler
Cornish boiler
Babcock and Wilcox boiler
Diagram efficiency
Nozzle efficiency
Gross efficiency
None of these
0.1 to 0.2 kg
0.2 to 0.4 kg
0.6 to 0.8 kg
1.0 to 1.5 kg
Increases steam pressure
Increases steam flow
Decreases fuel consumption
Decreases steam pressure
Absolute velocity at the inlet of moving blade is equal to that at the outlet
Relative velocity at the inlet of the 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 equal to that at the outlet
Remains constant
Increases
Decreases
Behaves unpredictably
Carbon, hydrogen, nitrogen, sulphur, moisture
Fixed carbon, ash, volatile matter, moisture
Higher calorific value
Lower calorific value
Blow off cock
Feed check valve
Economiser
Fusible plug
Higher value
Lower value
Same value
Any value
Steam enters and exhausts through the same port
Steam enters at one end and exhausts at the centre
Steam enters at the centre and exhausts at the other end
None of the above
Regeneration
Reheating of steam
Both (A) and (B)
Cooling of steam
Remains same
Decreases
Increases
None of these
Equal to the velocity of sound
Less than the velocity of sound
More than the velocity of sound
None of these