Q. What is a single valve engine?
A. It is an engine in which a single valve controls the admission and distribution of steam to both ends of the cylinder, or a common slide valve engine.
Q. What is a four valve engine?
A. An engine which has separate steam and exhaust valves for each end both top and bottom of cylinder, such as a Corliss engine.
Q. Into what three classes are engines divided with reference to the manner in which they are governed?
A. Throttling engines, Automatic cut-off and Governor engines.
Q. What is an Automatic cut-off engine?
A. An engine in which the amount of steam supplied is automatically cut off at various points in the stroke, in accordance with the load and pressure. In Throttling engines the volume admitted is constant and the pressure varied. In Automatic cut-off engines, steam is admitted at the highest available pressure, and the volume is varied to meet the requirements of the load. In Governor engines, the steam is admitted and cut off by the governor.
Q. What is a throttle governed engine?