Exam frequency
60%
Difficulty
3/5
Drill questions
59
Source excerpts
46 CFR §111.25-1
§ 111.25-1 -1 General requirements. The requirements for generators contained in § 111.12-5 apply to motors. [CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 62 FR 23908, May 1, 1997]
46 CFR §111.50-1
§ 111.50-1 -1 Protection of equipment. Overcurrent protection of electric equipment must meet the following listed subparts: (a) Appliances, subpart 111.77. (b) Generators, subpart 111.12. (c) Motors, motor circuits, and controllers, subpart 111.70. (d) Transformers, subpart 111.20. [CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by USCG-2020-0075, 88 FR 16362, Mar. 16, 2023]
46 CFR §183.100
§ 183.100 Intent. This part contains requirements for the design, construction, installation, and operation of electrical equipment and systems including power sources, lighting, motors, miscellaneous equipment, and safety systems.
46 CFR §183.320
§ 183.320 Generators and motors. (a) Each generator and motor must be: (1) In a location that is accessible, adequately ventilated, and as dry as practicable; and (2) Mounted above the bilges to avoid damage by splash and to avoid contact with low lying vapors. (b) Each generator and motor must be designed for an ambient temperature of 50 °C (122 °F) except that: (1) If the ambient temperature in the space where a generator or motor will be located will not exceed 40 °C (104 °F) under normal operating conditions, the generator or motor may be designed for an ambient temperature of 40 °C (104 °F); and (2) A generator or motor designed for 40 °C (104 °F) may be used in 50 °C (122 °F) ambient locations provided the generator or motor is derated to 80 percent of the full load rating, and…
DOE-HDBK-1011 Vol.4 §12-1
DOE-HDBK-1011 Vol.4 §12-1 — AC motor types, nameplate data, and protection AC motors drive the great majority of shipboard auxiliaries. The induction motor dominates: a three-phase stator sets up a rotating field at synchronous speed (Ns = 120f/poles) that induces rotor currents and drags the squirrel-cage rotor along at a slight slip. It is chosen for ruggedness, low cost, and needing no rotor connections. The synchronous motor runs at exactly synchronous speed with a DC-excited rotor and, when overexcited, supplies leading reactive power to correct plant power factor, but it needs a separate excitation source and a starting means. Wound-rotor induction motors allow external rotor resistance for high starting torque and speed control. A motor's nameplate fixes its rated voltage, full-loa…
NEETS Mod. 1 §1-3
NEETS Mod. 1 §1-3 — Magnetism and electromagnetism Magnetism and electricity are inseparable in generators and motors. A magnet has a north and a south pole; like poles repel and unlike poles attract. The space around a magnet contains a magnetic field made up of invisible lines of force (flux) that leave the north pole, travel through the surrounding medium, and enter the south pole, continuing through the magnet from south to north internally. Ferromagnetic materials (iron, steel, cobalt, nickel) concentrate flux and can be magnetized. Whenever current flows through a conductor it sets up a circular magnetic field around that conductor; the left-hand rule for conductors (electron flow) relates current direction to field direction. Winding the conductor into a coil (solenoid) concentrate…
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According to federal regulations, where must each generator and motor be mounted aboard a vessel?
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