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
D. It increases thermal efficiency
260 kW
282 kW
296 kW
302 kW
Has high heating value
Retards electric precipitation
Promotes complete combustion
Has highly corrosive effect
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
Economiser
Fusible plug
Superheater
Stop valve
Lancashire boiler
Locomotive boiler
Babcock and Wilcox boiler
Benson boiler
150 kg/h
210 kg/h
280 kg/h
340 kg/h
Increases
Decreases
Remains unchanged
Increases/decreases depending on steam temperature requirements
Solid and vapour phases are in equilibrium
Solid and liquid phases are in equilibrium
Liquid and vapour phases are in equilibrium
Solid, liquid and vapour phases are in equilibrium
Equal
Less
More
None of these
To reduce the ratio of expansion in each cylinder
To reduce the length of stroke
To reduce the temperature range in each cylinder
All of the above
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
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
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.
Keep the burner tips cool
Aid in proper combustion
Because sputtering, possibly extinguishing flame
Clean the nozzles
0.546
0.577
0.582
0.601
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
The efficiency of steam turbines is greater than steam engines
A flywheel is a must for steam turbine
The turbine blades do not change the direction of steam issuing from the nozzle
The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades
24 m
35 m
57.5 m
79 m
1 m
1.5 m
2 m
2.5 m
A steam turbine develops higher speeds
The efficiency of steam turbine is higher
The steam consumption is less
All of these
Clearance volume to the swept volume
Clearance volume to the volume at cut-off
Volume at cut-off to the swept volume
Swept volume to the clearance volume
Vb = 0.5 V cosα
Vb = V cos α
Vb = 0.5 V² cosα
Vb = V² cosα
Drooping characteristic
Linear characteristic
Rising characteristic
Flat characteristic
Same
Less
More
None of these
Reduce speed of rotor
Improve efficiency
Reduce exit losses
All of these
Lowers the boiling point of a liquid
Raises the boiling point of a liquid
Does not affects the boiling point of a liquid
Reduces its volume
Mean diameter and thickness
Inside diameter and thickness
Outside diameter and thickness
Outside diameter and inside diameter
Back pressure turbine
Pass out turbine
Low pressure turbine
Impulse turbine
Static
Dynamic
Static and dynamic
Neither static nor dynamic
Ratio of thermal efficiency to Rankine efficiency
Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam
Product of thermal efficiency and Rankine efficiency