Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From heating an intermediate material and then heating the air from this material
Heat is transferred by bleeding some gases from furnace
From a metal wall from one medium to another
By direct mixing

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for a compound 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
The cost of the engine, for the same power and economy, is more than that of a simple steam engine

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Steam Boilers, Engines, Nozzles and Turbines
Besides mean effective pressure, the data required to determine the indicated power of an engine include

Piston diameter, length of stroke and speed of rotation
Piston diameter, specific fuel consumption and Calorific value of fuel
Specific fuel consumption, speed of rotation and torque
Piston diameter, length of stroke and calorific value of fuel

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