Quantcast Appendix I Glossary - Cont'd -141200438
 

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MULTIMETER-- A single meter combining the
LINEAR-- Straight line relationship where changes in
functions of an ammeter, a voltmeter, and an
one function are directly proportional to changes in
another function.
NEGATIVE TEMPERATURE COEFFICIENT--
LOAD-- (1) A device through which an electric current
The temperature coefficient expressing the amount
flows and which changes electrical energy into
of reduction in the value of a quantity, such as
another form, (2) Power consumed by a device or
resistance for each degree of increase in
circuit in performing its function.
temperature.
LOGIC-- A method for describing the existing
NEUTRAL-- In a normal condition, neither positive or
condition of circuits and devices that can remain at
negative. A neutral object has a normal number of
only one of two opposite conditions at a particular
electrons.
time, such as ON or OFF, UP or DOWN, IN or OUT.
NO-BREAK POWER SUPPLY-- A device that
MAGNETIC FIELD-- The space in which a magnetic
supplies temporary power to the console during
force exists.
failure of the normal power supply.
MAGNETIC POLES-- The section of a magnet where
NOBLE-- A state in which a metal tends not to be
the flux lines are concentrated; also where they
active; the positive direction of electrode potential.
enter and leave the magnet.
NOBLE METAL-- A metal that is not very reactive,
MAGNETISM-- The property possessed by certain
such as silver, gold, or platinum, which may be
materials by which these materials can exert
found naturally in metallic form on earth.
mechanical force on neighboring masses of
NOBLE POTENTIAL-- A potential toward the
magnetic materials and can cause currents to be
positive end of a scale of electrode potentials.
induced in conducting bodies moving relative to the
magnetized bodies.
NONTRIP-FREE CIRCUIT BREAKER-- A circuit
breaker that can be held ON during an overcurrent
MANUAL THROTTLE CLUTCH-- Means of
condition.
m e c h a n i c a l l y disconnecting the throttle
handwheels, mounted on the engine-room console,
NORMAL MODE-- Operating condition at normal
ahead speeds, differing from maneuvering, where
from the reach rods that are connected to the throttle
certain functions, pumps, or valves are not required,
valves.
while others are for proper operation of ship and
MEGA-- A prefix meaning one million, also Meg.
machinery.
MHO-- Unit of conductance; the reciprocal of the ohm.
NULL POSITION-- Condition where the output shaft
MICRO-- A prefix meaning one-millionth.
is positioned to correspond to that which the input
shaft has been set.
MICROTESLA-- Equal to one million teslas.
OCTAL CODE-- Numeric system consisting of eight
MILLI-- A prefix meaning one-thousandth.
consecutive digits, 0 through 7.
MODULE-- Subassemblies mounted in a section.
OHM-- The unit of electrical resistance. It is that value
MONITOR-- One of the principal operating modes of
of electrical resistance through which a constant
a data logger that provides a constant check of plant
potential difference of 1 volt across the resistance
conditions.
will maintain a current flow of 1 ampere through
the resistance.
MONITORING POINT-- The physical location at
which any indicating device displays the value of a
OHM'S LAW-- The current in an electric circuit is
parameter at some control station.
directly proportional to the electromotive force
in the circuit. The most common form of the law is
MOVING-VANE METER MOVEMENT-- A meter
E= IR, where E is the electromotive force or voltage
movement that uses the magnetic repulsion of the
across the circuit, I is the current flowing in the
like poles created in two iron vanes by current
circuit, and R is the resistance of the circuit.
through a coil of wire: most commonly used
OHMIC VALUE-- Resistance in ohms.
movement for ac meters.

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