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Boiler glossary Q |
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| QUADRUPLE-EXPANSION ENGINE -- A steam
engine in which the steam is expanded successively in four cylinders of
increasing size, all working on the same crankshaft. Occasionally with two
low-pressure cylinders. Consequently five cylinders but expansion in four
steps. QUALITY CONTROL -- A form of inspection involving sampling of parts in a mathematical manner to determine whether or not the entire production run is acceptable, a specified number of defective parts being permissible. QUICK-BREAK SWITCH -- A switch having a spring or other device to produce a quick break, independently of the operator. QUICK-REVOLUTION ENGINES -- A term formerly applied to high-speed steam-engines direct-coupled to generators. |
© 2007 Lars Josefsson Boilers