Steam Boilers, Engines, Nozzles and Turbines
The three "Ts" for good combustion are

Thorough mixing, total air and temperature
Total air, time, and temperature
Temperature, time, and turbulence
Total air, true fuel, and turbulence

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Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Increase the temperature of saturated steam without raising its pressure
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

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Stack gases should not be cooled to the dew point
Approach temperature should be as low as possible
Handling and maintenance should be easier
Heat transfer area should be optimum

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Product of thermal efficiency and Rankine efficiency
Ratio of thermal efficiency to the Rankine efficiency
Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam

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Steam Boilers, Engines, Nozzles and Turbines
Pick up the correct statement as regards Cornish boiler and Lancashire boiler

Cornish is water tube and Lancashire is fire tube
Cornish is fire tube and Lancashire is water tube
Lancashire has two fire tubes and Cornish has one
Cornish has two fire tubes and Lancashire has one

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