Increases expansion ratio of steam
Reduces back pressure of steam
Reduces temperature of exhaust steam
All of these
D. All of these
Heating the oil in the settling tanks
Cooling the oil in the settling tanks
Burning the oil
Suspension
1.5 to 2 m
2.5 to 3.5 m
3.5 to 4.5 m
None of these
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Increase the temperature of saturated steam without raising its pressure
Inherent moisture and surface moisture are different things
In some coals moisture may be present up to 40%
Some moisture in coal helps in better burning which is not possible with completely dry coal
It increases thermal efficiency
Increases
Decreases
Remains constant
None of these
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
Cumulative heat drop to the isentropic heat drop
Isentropic heat drop to the heat supplied
Total useful heat drop to the total isentropic heat drop
None of the above
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
Cavitation of boiler feed pumps
Corrosion caused by oxygen
Heat transfer coefficient
pH value of water
Velocity compounding
Pressure compounding
Pressure-velocity compounding
All of these
Corroding air heaters
Spontaneous combustion during coal storage
Facilitating ash precipitation
All of the above
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
50°C and normal atmospheric pressure
50°C and 1.1 bar pressure
100°C and normal atmospheric pressure
100°C and 1.1 bar pressure
Induced draft fan
Smoke meter
Chimney
Precipitator
Equal to unity
Less than unity
Greater than unity
None of these
Horizontal
Vertical
Inclined
Both horizontal and vertical
The given boiler with the model
The two different boilers of the same make
Two different makes of boilers operating under the same operating conditions
Any type of boilers operating under any conditions
The mechanical draught reduces the height of chimney.
The natural draught reduces the fuel consumption.
A balanced draught is a combination of induced and forced draught.
All of the above
Equivalent evaporation
Factor of evaporation
Boiler efficiency
Power of a boiler
Remains constant
Decreases
Increases
None of these
Boiler drums
Superheater tubes
Economiser
A separate coil located in convection path.
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
Blow off cock
Fusible plug
Superheater
Stop valve
Increases expansion ratio of steam
Reduces back pressure of steam
Reduces temperature of exhaust steam
All of these
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
Only moving blades
Only fixed blades
Identical fixed and moving blades
Fixed and moving blades of different shape
Where low speeds are required
For small power purposes and low speeds
For large power purposes
For small power purposes and high speeds
Boiler effectiveness
Boiler evaporative capacity
Factor of evaporation
Boiler efficiency
Babcock and Wilcox
Locomotive
Lancashire
Cochran
Air present in atmosphere at NTP conditions
Air required for complete combustion of fuel with no excess air
Air required for optimum combustion so as to have reasonable excess air
Air required to convert CO into CO₂