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ABYC Electrical Exam Questions and Answers for Marine Technicians, Exams of Nursing

Cranfield UniversityNursing

A comprehensive set of questions and answers related to the abyc (american boat and yacht council) electrical standards for marine applications. It covers a wide range of topics, including circuit breakers, grounding, battery systems, inverters, generators, and troubleshooting techniques. Valuable for marine technicians and students seeking to understand and apply abyc standards in their work.

Typology: Exams

2024/2025

Available from 12/22/2024

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david-waweru-1 🇬🇧

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IYRS Electrical ABYC Exam With Correct
Answers.
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- 15
When testing for excessive EMF emission near a conductor or appliance, the tool of
choice is a - ANSWER- Gauss Meter
The primary problem with using a series circuit to supply multiple loads is that -
ANSWER- voltage drop across each load will be excessive
the most common electrical circuit problem in marine applications is - ANSWER-
unwanted open
the primary by-product of excessive electrical resistance is - ANSWER- heat
the tool of choice today for tracing shorted and open circuits is the: - ANSWER- TDR
What material is recommended for clamping conductors over engines and moving
machinery according to the ABYC - ANSWER- Metal
according to ABYC acceptable minimum clearance for routing wire near a dry exhaust
section is - ANSWER- 9 inches (225 mm)
The maximum number of terminals allowed to be attached to any one terminal stud
based on ABYC is - ANSWER- 4
How much current should flow through the
DC grounding conductor in a 25-amp DC motor circuit - ANSWER- 0 amps
conductors of #10 AWG and larger shall be permitted to be connected in parallel
______ - ANSWER- Where the ampacity of each individual conductor 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 aspart of a refit. The boat has a 12-volt system, and the distance from the panel
to the batteries is 15 ft (approximately 3 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- 0 AWG
8. DC grounded conductors on new boats that are also equipped with AC systems
should use _________ insulation. - ANSWER- yellow
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IYRS Electrical ABYC Exam With Correct

Answers.

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- 15 When testing for excessive EMF emission near a conductor or appliance, the tool of choice is a - ANSWER- Gauss Meter The primary problem with using a series circuit to supply multiple loads is that - ANSWER- voltage drop across each load will be excessive the most common electrical circuit problem in marine applications is - ANSWER- unwanted open the primary by-product of excessive electrical resistance is - ANSWER- heat the tool of choice today for tracing shorted and open circuits is the: - ANSWER- TDR What material is recommended for clamping conductors over engines and moving machinery according to the ABYC - ANSWER- Metal according to ABYC acceptable minimum clearance for routing wire near a dry exhaust section is - ANSWER- 9 inches (225 mm) The maximum number of terminals allowed to be attached to any one terminal stud based on ABYC is - ANSWER- 4 How much current should flow through the DC grounding conductor in a 25-amp DC motor circuit - ANSWER- 0 amps conductors of #10 AWG and larger shall be permitted to be connected in parallel ______ - ANSWER- Where the ampacity of each individual conductor 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 aspart of a refit. The boat has a 12-volt system, and the distance from the panel to the batteries is 15 ft (approximately 3 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- 0 AWG

  1. DC grounded conductors on new boats that are also equipped with AC systems should use _________ insulation. - ANSWER- yellow

the maximum spacing for cable run support based on ABYC is - ANSWER- 16 inches (400 mm) the smallest gauge cable allowed for unsheathed wire runs through the boat is - ANSWER- 16 AWG The maximum sustained charging voltage acceptable to some gel cell battery manufacturers is - ANSWER- 14. Sheathed, ungrounded conductors connected directly to a battery must have overcurrent protection devices located within _______ of connection to the battery - ANSWER- 40 Inches on a battery where a hydrometer can be used, a cell reading of 0.050 points of a specific gravity below all of the other cells in the battery may indicate - ANSWER- A bad cell and battery replacement needed some battery manufacturers will only consider replacement on batteries whose condition has been determined by use of a - ANSWER- conductance tester Tech A says that sealed batteries can be mounted anywhere in the boat where space can be found.TechBsays that consideration should be given to ventilation and the mounting surfaces and the surrounding area near the battery, and their resistance to acid attack.Which technician is correct? - ANSWER- tech B Minimum battery reserve capacity allowed based on ABYC standards is - ANSWER- 90 Minutes Based on ABYC standards, cable attachment to batteries with wing type nuts is allowed as long as the wire gauge does not exceed - ANSWER- 8 AWG Traditional battery load testing methods dictate that a load equivalent to _____ % of the battery's CCA rating be placed on the battery - ANSWER- 100 The metallic case of the battery charger should be connected to the - ANSWER- DC grounding system Tech A says that voltage supplied to the rotor controls alternator output voltage. Tech B says that the alternator output is proportional to rotor voltage. Which Technician is correct? - ANSWER- Both Techs A voltage regulator controls which of the following? - ANSWER- Alternator field Voltage

all of the following can cause an overheated electrical connection except - ANSWER- Conductor with an excessively high insulation temperature rating A customer complains that his generator will start from the local control panel at the generator, but not from the remote control panel at the helm location. Of the choices given, the most probable cause for this would be - ANSWER- Excessive voltage drop across the remote starter switch Low frequency output on a generator is probably caused by - ANSWER- low engine speed The tool of choice for testing AC generator winding insulation integrity is a - ANSWER- Megohmmeter on a brushless generator, a possible cause for low AC voltage output under load could be - ANSWER- faulty exciter winding diode rectifier Tech A sats that the ABYC has a pull test requirement for wiring connecting the generator to onboard circuits. Tech B says pull test requirements are dictated by the generator manufacturers. Which technician is correct? - ANSWER- Tech A If a customer complains of low voltage at the AC panel. the technician should first - ANSWER- Check voltage at the dock pedestal a true RMS voltmeter is required to accurately check output voltage from a - ANSWER- non-sinusoidal output inverter ABYC standard ________ applies to inverters - ANSWER- A- An AC voltmeter is required at the panel if the boat is equipped with - ANSWER- An inverter all of the following could cause a conductor to overheat except - ANSWER- Insulation temperature rating too low When Multiple conductors are bundled for a distance greater than ____ inches, the allowable ampacity of each conductor must be derated based on a table found within standard E-11 - ANSWER- 24 inches The minimum battery reserve capacity in hours or minutes for supplied battery power is ______ based on ABYC - ANSWER- 90 minutes Tech A says that a faulty circuit breaker could require an overhaul. Tech B says that circuit breakers used in recreational marine applications must be replace if found defective. Which tech is correct? - ANSWER- Tech B

the maximum allowable voltage drop permitted for panel board DC feeders based on ABYC is - ANSWER- 3% To test a 120v AC element in a water heater, the technician may run a ________ test. - ANSWER- Continuity Based on ABYC, all terminations for AC conductors must be installed - ANSWER- Inside an enclosure requiring the use of hand tools to open Based on the study guide, the best tool to use for locating short circuits today is the - ANSWER- TDR based on the material within this section, high-frequency transformers typically run ______ than traditional magnetic transformers - ANSWER- Cooler AC receptacles may be used for DC service based on ABYC standards as long as they are - ANSWER- Never used for DC service Motor circuits that do not provide their own integrated thermal cutout must be fused based on - ANSWER- Motor vendor recommendations When testing for a non-functional tachometer on a Diesel engine with a signal generator as the rpm signal source, the technician should use - ANSWER- a DVOM set to the AC volts scale When testing a temperature gauge, the technician removes the wire from the engine sending unit and grounds it to the engine block. the gauge then reads full scale. the gauge did not function before. The problem is - ANSWER- A faulty sending unit Tech A says that combined AC/DC panel boards are grounded via the DC negative bus. Tech B says that the panel board should be grounded to the AC grounding bus. which tech is correct - ANSWER- Tech B CO monitors will detect all the following except - ANSWER- Smoke The most common tool used in a corrosion survey is a - ANSWER- portable hull potential meter Appropriate bonding conductor sizing for a system tied in to offer lightning protections ____ based on ABYC - ANSWER- 6 AWG A polarity indicator light that is glowing more dimly than normal could be an indicator of - ANSWER- An open circuit in the neutral-to-ground link at an AC generator