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
A. Lowest temperature at which oil will flow under set condition
Has high heating value
Retards electric precipitation
Promotes complete combustion
Has highly corrosive effect
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
(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n - 1)/2] n + (1/n)
(p₂/p₁) = [(n + 1)/2] n - (1/n)
It increases the thermodynamic efficiency of the turbine
Boiler is supplied with hot water
It decreases the power developed by the turbine
All of the above
Mean diameter and thickness
Inside diameter and thickness
Outside diameter and thickness
Outside diameter and inside diameter
The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The amount of water evaporated from and at 100°C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100°C
Internally fired
Externally fired
Internally as well as externally fired
None of these
Remains constant
Increases
Decreases
Behaves unpredictably
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
Induced steam jet draught
Chimney draught
Forced steam jet draught
None of these
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
21 %
23 %
30 %
40 %
Back pressure turbine
Pass out turbine
Low pressure turbine
Impulse turbine
15 %
20 %
30 %
45 %
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
Efficiency of the boiler
Efficiency of the chimney
Efficiency of the fan
Power of the boiler
60°
90°
180°
270°
Diagram efficiency
Nozzle efficiency
Gross efficiency
None of these
30 MW
60 MW
100 MW
500 MW
0.18 MN/m²
1.8 MN/m²
18 MN/m²
180 MN/m²
Increases evaporative capacity of the boiler
Increases the efficiency of the boiler
Enables low grade fuel to be burnt
All of the above
The factor of evaporation for all boilers is always greater than unity.
The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
None of the above
Heat transfer takes place across cylinder walls
Work is done
Steam may be wet, dry or superheated after expansion
All of the above
0.2 to 0.5
0.5 to 0.65
0.65 to 0.9
0.8 to 1.2
421 kg.m
421 kg.m
539 kg.m
102 kg.m
LaMont boiler
Lancashire boiler
Velox boiler
Benson boiler
Blow off cock
Feed check valve
Economiser
Fusible plug
1000 J
360 kJ
3600 kJ
3600 kW/sec
Only moving blades
Only fixed blades
Identical fixed and moving blades
Fixed and moving blades of different shape
Temperature, time, and turbulence
Total air, true fuel, and turbulence
Thorough mixing, total air and temperature
Total air, time, and temperature