Exam (elaborations)
ADOC JOSMRC Part 1.
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Exam of 19 pages for the course Accounting 405 at Accounting 405 (ADOC JOSMRC Part 1.)
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ADOC JOSMRC Part 1What are the six core principles of Sound Shipboard Operating Principles? -
ANS-Formality;
Forceful backup;
Procedural compliance;
Integrity;
Questioning attitude;
Level of knowledge
voltage - ANS-electromotive force/potential difference [V]
current - ANS-the flow of electrons, by-products are heat and magnetic field [I/A]
resistance - ANS-electrical quantity that measures how the device/material reduces the
electric current flow through it [R ohms]
Ohm's Law - ANS-law relating the voltage difference b/w 2 points,
the electric current flowing b/w them, and the resistance of the path of the current
V=IR
Open Circuit - ANS-infinite resistance, zero current
short circuit - ANS-minimum resistance, max current
power - ANS-rate at which electrical energy is transferred by a circuit; rate at which
work is being done (watts, HP, joules per sec) [P]
Types of AC Power - ANS-True: dissipated by load (W)
Reactive: power absorbed & returned in load
Apparent: derivation of true & reactive
Power Factor - ANS-Ratio of real power flowing to load to apparent power in circuit; ID
power lost (heat, magnetic field); standard is 0.8 pf or 80%
Direct Current - ANS-unidirectional flow of electric charge [DC]
Alternating Current - ANS-electric current in which flow of electric charge periodically
reverses direction [AC]
,Frequency - ANS-# of cycles per sec [Hz]
Polarity - ANS-direction of current flow in electrical circuit, from positive to negative
(electrons flow from negative to positive)
Conductors - ANS-substance in which electrical charge carriers, usually electrons,
move easily from atom to atom with the application of voltage (silver, gold, copper)
Insulator - ANS-Having extremely high resistance to the flow of charge through them
(wood, fiberglass, plastic, rubber)
Capacitance - ANS-device to store electric charge; one or more pairs of conductors
separated by an insulator [C]
Capacitor Safety - ANS-use shorting probe, discharge capacitors before work on equip
Inductance - ANS-passive 2 terminal electrical component which resists changes in
electric current passing through it; Energy is stored in a magnetic field around the coil
as long as current flows [L]
Requirements for AC EM induction
"Momma's Fried Chicken" - ANS-Motion (Rel)
Field (mag)
Conductor
prime mover - ANS-engine that converts fuel to useful work
Parts of a Generator (4) - ANS-Internal;
Permanent Magnetic Alternator; Governor;
Voltage Regulator
Internal parts of a generator - ANS-Stator;
rotor;
Poles;
Armature;
Field Windings
stator - ANS-Stationary element;
Conductor of MFC;
, Houses Armature Windings
rotor - ANS-Rotating element;
Receives excitation voltage from the rotating rectifier assembly;
Provides main magnetic field for the generator;
Consists of Field Windings
poles - ANS-Most Naval Generators have 4 poles (2 N, 2 S)
armature - ANS-Moving conductor of MFC;
Current carrying piece
field windings - ANS-Produces magnetic field in a motor/generator
Permanent Magnetic Alternator - ANS-120 VAC excitation power to voltage regulator
during initial start-up; once the main generator field voltage reaches 340 VAC, the VR
will switch excitation power over to the main generator field
Governor - ANS-convert electrical signal to mechanical motion, to control amount of fuel
injected to engine
Voltage Regulator - ANS-maintains 450 VAC generated; adjusts DC voltage on rotor
Transformer theory - ANS-Transfers AC Power from one circuit to another by EM
Induction;
FREQUENCY is not changed;
No Moving Parts;
"Step-Up" or "Step-Down";
Determined by "Turns ratio" of primary and secondary windings
selective tripping - ANS-Provides for removal from the system of a faulted part only,
leaving the rest of the
system in operation;
Ensures protective device closest to fault trips
selected tripping - ANS-Manual tripping of a breaker or switch;
Turing on/off light switches;
Turning on/off equipment; T/S, Ground Isolation procedure used to isolate faulted
component
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