Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Power of the boiler
Efficiency of the chimney
Efficiency of the fan
Efficiency of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
The effect of friction on the flow of steam through a nozzle is to

Decrease the mass flow rate and to decrease the wetness of steam
Decrease the mass flow rate and to increase the wetness of steam
Increase the mass flow rate and to increase the exit temperature
Increase the exit temperature without any effect on mass flow rate

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for a compound steam engine?

The cost of the engine, for the same power and economy, is more than that of a simple steam engine
The ratio of expansion is reduced, thus reducing the length of stroke
The temperature range per cylinder is increased, with corresponding increase in condensation
The forces in the working parts are increased as the forces are distributed over more parts

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