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 TM 5-685/NAVFAC MO-912
Magnetism
Switchgear
General term, covers switching and interrupting de-
Property of certain materials which exerts a me-
vices including their associated control, instrumen-
chanical force, attraction or repulsion, on an adja-
tation, metering, protective devices, and housing.
cent mass of similar materials.
Used relative to generation, transmission, distribu-
Otto cycle
tion, and conversion of electric power.
The operating principle by which a piston (recipro-
cating) engine operates, called constant volume
Instrument that measures angular speed, such as
that of a rotating prime mover shaft. Tachometers
Polychlorinated biphenyls
covered herein usually use a magnetic pick-up to
sense speed.
PCB, a liquid with high dielectric strength that was
used as an insulator in power transformers, relays,
Two-cycle (two-stroke) engine
circuit breakers, etc.
A reciprocating (piston) engine using diesel oil for
fuel. The engine produces one power impulse per
Scavenging
cylinder for every two strokes of the piston. One
The removal of exhaust (burned) gases from the
stroke is one pass through the cylinder.
cylinders of a piston (reciprocating) engine. Also,
refers to the collection and removal of excess lubri-
Turbocharge
cating oil from a bearing housing in a gas turbine
A method of increasing the volume of air charge in
engine.
the cylinders of piston engines to produce higher
power output. Flow of exhaust gases operates a tur-
Supercharge
bocharger.
A method of increasing the volume of air charge in
Voltage regulator
the cylinders of piston engines to produce higher
A device which controls the output voltage of a gen-
power output. A belt or chain driven blower is used
erator.
to supercharge an engine.
Glossary 3
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