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M

MOST SIGNIFICANT DIGIT

The MSD is the digit whose position within a given number expression has the greatest weighting power [13].


MOTOR

A machine that converts electrical energy to mechanical energy. It is activated by ac or dc voltage, depending on the design [5].


MOTOR LOAD

Any device driven by a motor. Typical loads are drills, saws, water pumps, rotating antennas, generators, and so forth. The speed and power capabilities of a motor must be matched to the speed and power capabilities of the motor load [5].


MOTOR REACTION

The force created by generator armature current that tends to oppose the normal rotation of the armature [5].


MOTOR STARTERS

Large resistive devices placed in series with dc motor armatures to prevent the
armature from drawing excessive current until armature speed develops counter emf. The resistance is gradually removed from the circuit either automatically or manually as motor speed increases [5].


MOVING TARGET INDICATOR

A device that limits the display of radar information to moving targets [18].


MOVING-IRON METER MOVEMENT

Same as MOVING-VANE METER MOVEMENT [3].

MOVING-VANE METER MOVEMENT

A meter movement that uses the magnetic repulsion of the like poles created in two iron vanes by current through a coil of wire; most commonly used movement for ac meters [3].


MSD

See MOST SIGNIFICANT DIGIT [13].

MTDS

An abbreviation for the marine tactical data system [17].


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