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ABYC Marine Electrical Certification Exam Review
- 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.
- When testing for excessive EMF emission near a conductor or appliance, the tool of choice is a (n):
A. 15
C. Gauss meter
- What is the symbol for a variable resistor? variable resistor
- The primary problem with using a series circuit A. Voltage drop through the circuit to supply multiple loads is that: will be excessive
- Based on this section (Ch. 2), the most common C. Unwanted open electrical circuit problem in marine application is:
- The primary by-product of excessive electrical resistance is:
D. Heat
- One horsepower equals. B. 746 watts
- Excessive electrical resistance can be caused by D. Undersized wire, loose connec- .
- through circuits on a boat is perhaps the most common problem with electrical cir- cuitry.
tions, and corrosion
D. Resistance to electrical current flow
ABYC Marine Electrical Certification Exam Review
- When using Ohm's Law, if any two of the three values are known, the thrid value can be calcu- lated by.
- 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.
A. , Multiplication or division
C. 4
- If resistance decreases and the voltage remains B. Increase constant in a circuit, then the amperage will .
- The unit of measure for power is the. A. Watt
- A microwave oven with a wattage of 1.2 KW (1,200 watts) and a 120 VAC will draw amps.
- Cranking motor (engine) circuits are not re- quired to have.
- In a circuit, there is only one path al- lowed for electrical flow.
- In a series circuit, the amperage (current) is .
D. 10
B. Overcurrent protection
C. Series
A. The same everywhere it is mea- sured
- In all circuits, voltage is lost as it travels through B. Voltage drop the circuit, which is commonly referred to as .
- The most common type of circuit fault is a(n) .
C. Open circuit
ABYC Marine Electrical Certification Exam Review
carry the entire load current shared by the parallel conductors.
- A technician is installing the cable run from the A. 0 AWG 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 cur- rent draw from the panel is calculated at 90 amps. What gauge cable should be used at a minimum to maintain Standards compliance?
- DC grounded conductors on new boats that are D. Yellow also equipped with AC systems should use what color insulation?
- The maximum spacing for cable run support based on ABYC is:
- The smallest gauge cable allowed for un- sheathed wire runs through the boat is:
- While there's some variation among countries, in North America the preferred colors for 120 VAC are.
D. 18 in. (450 mm)
B. 16 AWG
C. black, white, and green
- If conductors color coding is not enough, alter- D. Wiring diagram or wiring legend native labeling may be used for DC conductors as long as a is provided in the boat's documentation.
- When AC and DC conductors converge at the back of panelboards, the use of insu-
B. Yellow
ABYC Marine Electrical Certification Exam Review
lation for DC negative conductors gives a quick and distinctive differential between DC nega- tive and AC hot conductors.
- The isolation on grounding conductors should be either.
C. Green or green with yellow stripe
- A time-domain reflectometer (TDR) can confirm A. Pinpoint the location of a short or continuity and. open circuit
- Most wiring-related problems occur. B. At termination points
- For battery cable gauge sizes, the tool of choice D. Box Crimper for terminations is referred to as , which leaves a square crimp on the terminal.
- Minimal support for wire bundles should occur A. 18 at least every inches, according to Standard E-11.14.4.1.9.
- DC derating table for voltage drop are specified C. 3% and a 10% for both a maximum voltage drop.
- Voltage drop is not considered with AC because B. The length of wire runs for AC .
- Conductors used for lighting, other than navi- gation lights, and other circuits where voltage drop is not critical, shall be sized for a voltage drop not to exceed.
circuits is not typically long enough to be a significant factor for perfor- mance.
A. 10%
ABYC Marine Electrical Certification Exam Review
found. Tech B says 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?
- Based on ABYC Standards, cable attachment to C. 8 AWG batteries with wing-type nuts is allowed as long as the wire gauge does not exceed:
- Traditional battery load testing methods dic- tate that a load equivalent to % of the battery's CCA rating be placed on the battery.
C. 50
- The metallic case of the battery charger should C. DC grounding system be connected to the:
- 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?
- A voltage regulator controls which of the fol- lowing?
- To check for charger output to the battery, de-energize charger, check battery open-circuit voltage, re-energize the charger and check for a voltage V DC or more.
- Tech A says that AC and DC are able to run together down the same conductor. Tech B says
C. Both techs
D. Alternator field voltage
D. Rise of 0.
A. Tech A
ABYC Marine Electrical Certification Exam Review
this is technically impossible. Which technician is correct?
- When installing an inverter in a split bus appli- cation, it is important to provide:
- The best fuse type to use for the DC feed to an inverter is:
- On an inverter that does not provide a true sine wave output, low-voltage troubleshooting must be accomplished using a(n) -type DVOM.
- As part of an inverter installation, a battery switch is required if the DC power source has a cumulative CCA rating of or more.
D. Both A and C
B. Class T
C. True RMS
A. 801
- The tool of choice for determining an inverter's D. Gauss Meter level of EMI is the:
- According to ABYC, the shore-power grounded conductor should:
B. Not be grounded onboard the boat
- If a customer complains about receiving shocks A. Polarity check of the shore cord from his/her boat when the boat is plugged into shore power, the first test should be:
- If a customer complains of low voltage at the AC panel, the technician should first:
- A customer complains about a reverse polarity problem. All of the following are likely causes of the problem except:
B. Check voltage at the dock pedestal
C. An open neutral.
- Battery types generally fall into one of tow broad categories: "deep-cycle" and " ."
- An important characteristic of cranking batter- ies, compare to deep-cycle batteries, is that due to the relatively thin plate format, they typically .
- Voltage-sensing battery combiners available today do not suffer from inherent voltage drop of a diode, typically about volts.
- The calibration of a battery hydrometer is based on , which is one of the primary components of the electrolyte.
- The numbers on a float scale will be around for a fully charged battery cell.
A. Cranking
D. Recharge more quickly
B. 0.
C. Water
A. 1.260-1.
- A hydrometer reading will be close to the base- A. 1 line of for water.
- A battery should rest for hours before an accurate reading can be derived for battery testing.
- Two 12-volt batteries connected in series will give volts
- Most engine-driven alternators with self-con- tained voltage regulators are set to volts, which is too high for a gel cell.
C. 8-
C. 24
D. 14.
- A household staple used to clean batteries and A. Baking soda neutralize acid is.
- Battery are electronic control boxes de- C. Equalizers signed to distribute mixed voltage.
- A healthy, fully charged battery at rest will show D. 12. a minimum of volts, measured across its terminals.
- Batteries must securely installed to allow less than inch(es) of movement in any plane, and the installation must provide a means to contain any spilled or leaked elec- trolyte.
- Each metallic fuel line and fuel system compo- nent within inches of the horizontal or vertical plane of the battery surface contain- ing the terminals, as installed, shall be shielded with dielectric material to protect against acci- dental short-circuiting.
- Battery cables and other conductors size AWG and larger will not be connected to a battery with wing nuts.
- An overcurrent protection devices should be located as close as practical to the source of power -- the basic rule within inches.
B. 1
D. 36
C. 6
B. 7
- A is a material used as a continuous pro- C. Sheath tective covering, such as overlapping electrical
- A DC case ground should not be more than gauge size(s) less than the DC cur- rent- carrying conductor from the output side of the charger, or, in the case of an inverter, the combined DC feed, and return when in charge mode.
- One of the unique characteristics of a true DC generator is that it will also function as a(n) .
- Two diodes connected in series will induce about a volt drop.
- Pigtails less than inches in length are exempt from overcurrent protection require- ments.
- When selecting an inverter, is the primary concern.
A. 1
B. DC motor
D. 1.
A. 7
B. Output capacity
- The efficiency loss through inverters is typically B. 5% to 15% between , so a battery charger cannot be powered from one and create a per- petual system.
- The defines how much amperage a fuse or breaker can be subjected to without locking or welding itself into the permanently closed position.
D. AIC rating
- A. Battery Switch
The ABYC requires a(n) in any DC feed from a battery bank with a capacity over 800 CCA.
- The main circuit breaker(s) are considered to be C. Branch the first breaker(s) in a circuit connected in se- ries with the battery. All subsequent breakers, including sub-main breakers, connected in se- ries with a main circuit breaker are considered to be " circuit breakers."
- A battery switch shall be installed in the conductor(s) from each battery or battery bank with a CC rating greater than 800 amperes or 100 AH if CCA is unavailable.
- of the AC output waveform of some inverters may affect the operation of some GFCI devices.
B. Positive
A. Harmonic Distortion
- Since some inverters do not necessarily output C. True root mean square (RMS) a true sine waveform of AC, a DVOM that uses a(n) algorithm for interpreting what is "sees" is a must.
- Gear that functions normally when run from a shore power source but either functions errati- cally or not at all when run from an inverter (or generator) is almost always a(n) issue.
- A(n) reads the strength of magnetic field emission and can be used to establish a
D. Waveform
A. Guass Meter
- A(n) galvanic isolator is an isolator that, if after meeting all other criteria of this standard, meets the requirements of an effec- tive ground-fault path when subjected to test conditions.
- Standard 28.7.7 states that conductor(s) shall be supported and/ or clamped to relieve strain within inch(es) of the isolator case.
D. fail safe
C. six
- A galvanic isolator shall be provided with wiring D. 135 terminals or wire leads for connection of con- ductors, having an ampacity that is percent of its nominal rating.
- An overcurrent feeder protection device shall be rated at not more than % of the rated primary current of the transformer.
- The total impedance of polarity indication and protection devices connected between normal current carrying conductors (ground{white} conductors and ungrounded {black} conduc- tor) and the grounding conductor shall not be less than ohms at 120 volts, 60 hertz at all times.
- The first step in troubleshooting shore-power related issues is to.
- A dropped neutral can cause AC equipment onboard to fail, depending upon how well-bal- anced the two "legs" of the system are and
C. 125
C. 25,
A. confirm the integrity of the electri- cal supply at the dock
D. neutral
what is turned on when the conductor becomes disconnected.
- Most of the newest AC generators come with built-in diagnostics, often displayed as a on a digital display.
D. Trouble code
- During troubleshooting, if there is a low voltage B. Voltage drop reading at the generator is normal, there is a(n) problem between the genset and the AC panel.
- The normal frequency range for an AC genera- tor is Hz.
- A(n) should be used to troubleshoot diodes and capacitors in an AC generator, al- though specific resistance values for the com- ponents used and which terminals to use as check points will also need to be verified.
- are used to confirm the integrity of the winding insulation inside a generator or motor and can also be used to check everyday appliances for ground leaks to the case of the equipment.
- Iron and steel parts shall be protected against by painting, galvanizing, plating, or by other protective coating.
C. 57-
A. Multimeter (DVOM)
B. Megohmmeters
D. Corrosion
- The generator and feeder conductors to a junc- A. 120 tion box for connection to a load shall be pro-
cations must be replaced if found defective. Which tech is correct?
- The maximum allowable voltage drop permit- ted for panelboard DC feeders based on ABYC is:
- All of the following could cause a conductor to overheat except:
B. 3%
C. Insulation temperature rating too low
- To test a 120 V AC element in a water heater, the C. Continuity technician may run a test.
- Based on ABYC, all terminations for AC conduc- B. Inside an enclosure requiring the tors must be installed:
- Based on the study guide, the best tool to use for locating short circuits:
- To safely diagnose the condition of a capacitor, you should the capacitor.
- AC receptacles may be used for DC service based on ABYC Standards as long as they are:
- Motor circuits that do not provide their own integrated thermal cutout must be fused based on:
- When testing for a non-functional tachometer on a diesel engine with a signal generator as the rpm signal source, the technician should use:
use of hand tools to open
D. TDR
C. isolate and discharge
D. Never to be used for DC service
D. Motor vendor recommendations
A. A DVOM set to the AC volts scale
- When testing a temperature gauge, the techni- D. A faulty sending unit cian removes the wire from the engine sending unit and grounds it to the engine block. The gauge did not function before. The problem is:
- Tech A says that combined AC/DC panelboards are grounded via the DC negative bus. Tech B says that the panelboard should be grounded to the AC grounding bus. Which tech is correct?
B. Tech B
- CO monitors will detect all the following except: D. Smoke
- The most common tool used in a corrosion sur- A. Portable hull potential meter vey is a(n):
- Appropriate bonding conductor sizing for a system tied in to offer lightning protection is based on ABYC.
- A polarity indicator light that is glowing more dimly than normal could be an indicator or:
- The RMS multiplier you use to determine har- monic distortion in an AC power supply is:
- When clamping a shore power cord and ac- tivating AC circuits one by one, the techni- cian notices that the AC leakage current mea- sured keeps getting higher as each appliance is turned on. This most likely indicates:
B. 6 AWG
An open circuit in the neu- tral-to-ground link at an AC genera- tor
D. 1.
D. A neutral-to-ground link at the boat's AC panelboard
- B. warning label
