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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
For combustion of a fuel, following is essential

Correct fuel air ratio
All the three above
Proper ignition temperature
O₂ to support combustion

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge through a chimney occurs when the height of chimney is

Infinitely long
Outside temperature is very low
Around 200 meters
Equal to the height of the hot gas column producing draught

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Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Corroding air heaters
All of these
Spontaneous combustion during coal storage
Facilitating ash precipitation

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 hd K
V = 44.72 K hd
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Increases
Decreases
Remains unchanged
Increases/decreases depending on steam temperature requirements

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is used where working pressure and power required are

None of these
High
Low
Moderate

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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