Anthracite coal
Bituminous coal
Lignite
Peat
A. Anthracite coal
Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Work is done during adiabatic expansion
Change in enthalpy
To dry flue gases
In moisture present in the fuel
To steam formed by combustion of hydrogen per kg of fuel
All of the above
When the cross-section of the nozzle increases continuously from entrance to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
None of the above
Piston diameter, length of stroke and calorific value of fuel
Piston diameter, specific fuel consumption and Calorific value of fuel
Piston diameter, length of stroke and speed of rotation
Specific fuel consumption, speed of rotation and torque
Feed pump
Injector
Feed check valve
Pressure gauge
Serve as storage of steam
Serve as storage of feed water for water wall
Remove salts from water
Separate steam from water
Increases
Decreases
Remain constant
May increase or decrease depending upon the method of storage
Create vacuum
Inject chemical solution in feed pump
Pump water, similar to boiler feed pump
Add make up water in the system
Wet
Superheated
Remain dry saturated
Dry
CO₂
CO
O₂
N₂
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
Boiler effectiveness
Boiler evaporative capacity
Factor of evaporation
Boiler efficiency
Vertical fire tube type
Horizontal fire tube type
Horizontal water tube type
Forced circulation type
21 %
23 %
30 %
40 %
To provide reciprocating motion to the slide valve
To convert reciprocating motion of the piston into rotary motion of the crank
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide simple harmonic motion to the D-slide valve
Lowest temperature at which oil will flow under set condition
Storage temperature
Temperature at which fuel is pumped through burners
Temperature at which oil is transported
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
Frictional losses
It is not possible to achieve 0°K temperature
Leakage
Non availability of ideal substance
V = 2g H'
V = 2g/H'
V = H'/2g
V = 2gH'
Equal
Half
Double
Four times
Linearly
Slowly first and then rapidly
Rapidly first and then slowly
Inversely
Complete account of heat supplied by 1 kg of dry fuel and the heat consumed
Moisture present in the fuel
Steam formed by combustion of hydrogen per kg of fuel
All of the above
100°C
Above dew point temperature of flue gases
Below dew point temperature of flue gases
Less than wet bulb temperature of flue gases
One fourth
Half
One
Two
12 m
1.52.5 m
23 m
2.53.5 m
Steam evaporation rate per kg of fuel fired
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done by 1 kg of steam at saturation condition
The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
The flow in the convergent portion of the nozzle is subsonic.
The flow in the divergent portion of the nozzle is supersonic.
To increase the velocity of steam above sonic velocity (supersonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.
Producer gas
Coal gas
Water gas
Blast furnace gas
Before the economiser
Before the superheater
Between the economiser and chimney
None of these
Tonnes/hr. of steam
Pressure of steam in kg/cm²
Temperature of steam in °C
All of the above