The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.

Camshafts are usually driven by timing gears or （）.

A.push rods
B.chain drives
C.rocker arms
D.flywheels

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A waste heat boiler is installed on some diesel propelled vessels to （）.

A.provide steam for emergency propulsion
B.provide steam for the turbo-generator
C.heat the waste water tanks
D.steam for warming engines

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