Steam Boilers, Engines, Nozzles and Turbines
A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

Receiver type compound engine
Both (A) and (B)
Tandem type compound engine
Woolf type compound engine

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

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

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