ABYC Electrical Study Guide 2025 | Marine Technician Certification Prep

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The minimum amp circuit breaker that should be used to protect a 120V water heater circuit with
a 1600-watt element would be rated at ___________ amps. - ANSWER ✔ A. 15




When testing for excessive EMF emission near a conductor or appliance, the tool of choice is a
(n): - ANSWER ✔ C. Gauss meter




What is the symbol for a variable resistor? - ANSWER ✔ variable resistor




The primary problem with using a series circuit to supply multiple loads is that: - ANSWER ✔ A.
Voltage drop through the circuit will be excessive




Based on this section (Ch. 2), the most common electrical circuit problem in marine application
is: - ANSWER ✔ C. Unwanted open




The primary by-product of excessive electrical resistance is: - ANSWER ✔ D. Heat




One horsepower equals ______________. - ANSWER ✔ B. 746 watts




Excessive electrical resistance can be caused by ____________. - ANSWER ✔ D. Undersized
wire, loose connections, and corrosion




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_________ through circuits on a boat is perhaps the most common problem with electrical
circuitry. - ANSWER ✔ D. Resistance to electrical current flow




When using Ohm's Law, if any two of the three values are known, the thrid value can be
calculated by ________. - ANSWER ✔ A., Multiplication or division




If the voltage in a circuit is 12 volts and the resistance is 3 Ohms, Ohm's Law can be used to
find that the rate of flow is _______ amps. - ANSWER ✔ C. 4




If resistance decreases and the voltage remains constant in a circuit, then the amperage will
_________. - ANSWER ✔ B. Increase




The unit of measure for power is the __________. - ANSWER ✔ A. Watt




A microwave oven with a wattage of 1.2 KW (1,200 watts) and a 120 VAC will draw __________
amps. - ANSWER ✔ D. 10




Cranking motor (engine) circuits are not required to have ___________. - ANSWER ✔ B.
Overcurrent protection




In a _______ circuit, there is only one path allowed for electrical flow. - ANSWER ✔ C. Series




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In a series circuit, the amperage (current) is ______________. - ANSWER ✔ A. The same
everywhere it is measured




In all circuits, voltage is lost as it travels through the circuit, which is commonly referred to as
___________. - ANSWER ✔ B. Voltage drop




The most common type of circuit fault is a(n) ______. - ANSWER ✔ C. Open circuit




The ______ is the most dangerous type of short circuit. - ANSWER ✔ D. Short circuit to ground




Inter-circuit shorts are usually caused by __________. - ANSWER ✔ C. An errant screw sticking
through a look or wiring harness




One horsepower is equal to __________ watts. - ANSWER ✔ A. 746




The primary by-product of excessive electrical resistance is __________. - ANSWER ✔ B. Heat




Based on what this section has told you, the tool of choice today for tracing shortened and open
circuits is the: - ANSWER ✔ D. TDR= Time-Domain Reflectometer




What material is recommended for clamping conductors over engines and moving machinery
according to ABYC? - ANSWER ✔ C. Metal




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According to ABYC, acceptable minimum clearance for routing wire near a dry exhaust section
is: - ANSWER ✔ B. 9 in. (225 mm)




The maximum number of terminals allowed to be attached to any one terminal stud based on
ABYC Standards is: - ANSWER ✔ D. 4




How much current should flow through the DC grounding conductor in a 25-amp DC motor
circuit? - ANSWER ✔ B. 0 amps




Conductors of #10 AWG and larger shall be permitted to be connected in parallel _______ -
ANSWER ✔ C. Where the ampacity of each individual conductors is sufficient to carry the entire
load current shared by the parallel conductors.




A technician is installing the cable run from the batteries to the main DC panelboard on a boat
as part of a refit. the boat has a 12-volt system, and the distance from the panel to batteries is
15 ft (approximately 5 m). The maximum current draw from the panel is calculated at 90 amps.
What gauge cable should be used at a minimum to maintain Standards compliance? -
ANSWER ✔ A. 0 AWG




DC grounded conductors on new boats that are also equipped with AC systems should use
what color insulation? - ANSWER ✔ D. Yellow




The maximum spacing for cable run support based on ABYC is: - ANSWER ✔ D. 18 in. (450
mm)




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