ABYC Marine Electrical Certification Exam Review

a. ABYC A-20 Battery Charging Devices

1f an inverter also serves as a battery charger it shall also meet the requirements of: a. ABYC A-20 Battery Charging Devices b. ABYC E-6 Refrigeration Equipment installation c. A-16 Electric Navigational lighting d. All of the above

c. 14.6 Amps (not Volts!!)

A 120V hot water heater is rated at 1750 watts. How much current does it use: a. 12.5 Amps b. 12.5 Ohms c. 14.6 Amps d. 14.6 Volts

a. 89 amps

A 2000 watt inverter is operating at 50% capacity with a 90% effeciency rating. With a battery voltage of 12.6 volts how many amps is the inverter drawing from the battery bank? a. 89 amps b. 99 amps c. 109 amps d. 119 amps

d. 158 amps

A 2000 watt inverter is operating inverting at 100% effeciency. With 12.6 volts, how many amps is the inverter drawing from the battery bank? a. 120 amps b. 123 amps c. 137 amps d. 158 amps

c. 150% (see 11.10.1.5.2)

A branch circuit for DC power can have overcurrent protection not to exceed _____ of conductor ampacity. a. 125% b. 135% c. 150% d. Not required

C. Excessive voltage drop across the remote starter switch

A customer complains that her generator will start from the local control panel at the generator, but not from the remote control panel at the helm. Which of the foillowing is the most probably cause? A. Bad generator starter solenoid B. Low voltage at the starter battery C. Excessive voltage drop across the remote starter switch D. Loose battery cable clamp at the starter battery

b. 150 amps (25% of capacity)

A customer has a 600 Ah 'house' battery bank and wants to recharge with the highest amperage (standard flooded batteries are being used). How high amperage is reasonable? a. 200 amps b. 150 amps c. 100 amps d. 50 amps

B. Check the voltage at the dock pedestal

A customer is complaining about low-voltage at the AC panel. What should you do first? A. Re-calibrate the panel meter B. Check the voltage at the dock pedestal C. Check the polarity indicator D. Replace the overcurrent device

C. An open neutral

A customer notes a reverse-polarity problem. All of the following are likely causes, except: A. Improperly wired shore power cord B. Improperly wired shore power inlet receptacle C. An open neutral D. Reversal of the hot and neutral conductors in the AC panel feeder cable

a. low amperage long term discharge

A deep cycle battery is one with an internal design that suits: a. low amperage long term discharge b. high amperage long term discharge c. low amperage short term discharge d. high amperage short term discharge

c. only in one direction

A diode is a semiconductor that passes current a. in any direction b. only with high voltages c. only in one direction d. when used as a triggering device

d. 12.6 - 12.8 volts

A fully charged 12 volt battery, after a period of rest during which nothing has been put in or taken out, should have a fully charged voltage of: a. 12.0 - 12.2 volts b. 12.2 - 12.4 volts c. 12.4 - 12.6 volts d. 12.6 - 12.8 volts

c. 12.7

A fully charged battery, at rest will have a voltage of: a. 12.2 b. 11.5 c. 12.7 d. 13.2

c. 135% (see A-28.11.1)

A galvanic isolator will be connected with conductors having an ampacity that is _____ of the isolator's rating. a. 120% b. 125% c. 135% d. 150%

d. hydrogen

A gassing battery gives off: a. sulfuroxide b. nitrous oxide c. nitrogen d. hydrogen

F (impedance refers to AC systems)

(T or F) Impedance can be defined as the total resistance flow in a D.C. system

c. 30 W

A light circuit uses a 12 volt battery to power a bulb which uses 2.5 amps of power. How many watts Is the light bulb? a. 10 W b. 20 W c. 30 W d. 40 W

d. Not allowing the engine to start when not in neutral

A neutral safety switch is used for: a. Safely switching between forward and reverse without damaging transmission b. Not allowing the engine to start with gear in neutral c. Safely allowing someone to be in the water (like skier) without risk of propeller strike d. Not allowing the engine to start when not in neutral

a. 100% (see E-11.10.1.5.4)

A panelboard or switchboard with no sub-main circuit breaker or fuse shall have installed, at the source of power, overcurrent protection not to exceed _______ of the load capacity of that panel, or the current carrying capacity of the feeders. a. 100% b. 120% c. 135% d. 150%

A. An open circuit in the neutral to ground link at an AC generator

A polarity indicator light that is glowing more dimly than normal could be an indicator of: A. An open circuit in the neutral to ground link at an AC generator B. An open circuit in the hot wire connection C. A ground connection with very low impedance D. Excessive AC frequency

b. 169 Volts

A sine wave for "Shore Power" AC has an RMS value of 120 volts. What is its peak value? a. 120 Volts b. 169 Volts c. 208 Volts d. 240 Volts

d. All of the above

A successful customer experience includes: a. Being neat and prompt b. Asking question to verify a complaint c. Listening to the customer d. All of the above

E. All of the above

A system voltmeter shall be installed on the main panel board if the system is permanently connected to: A. Inverter B. Generator C. Motor D. B & C above E. All of the above

f. all of the above

A system voltmeter shall be installed on the main panelboard if the system is permanently connected to a . an inverter b. a generator c. motor circuits d. b and c above e. a and b above f. all of the above

b. Technician B

A technician is checking a shore power cord with a clamp on AC current meter. The meter is reading 1.6 amps. Technician A says this is NOT a valid test because the incoming and outgoing AC electricity cancels each other out - you need to check individual wires, not around an entire cord. Technician B says this is a dangerous situation and AC may be present in the water - immediate attention to the problem is required. Who is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

0 AWG

A technician is installing a cable run from the batteries to the main DC panel board on a boat as part of a refit. The boat has a 12-volt system and the distance form the panel to the batteries is 15 ft. The maximum current draw from the panel is calculated at 90 amps. What guage cable should be used (minimum)?

d) If its maximum overload current exceeds 120% of its rated output. (see 11.6.2.3.2, exception)

ABYC requires self-limiting generators to have external over current protection... a) To match maximum rated output b) At 120% of maximum rated output c) Not at all. d) If its maximum overload current exceeds 120% of its rated output.

d. all of the above

AC grounding conductors connect metallic non-current carrying parts of the electrical equipment to which other part? a. the AC grounding system onboard the boat b. the engine negative terminal, or its bus c. the shore AC grounding conductor through the shore power cord d. all of the above

a. 10'

According to ABYC Standard E-11, the distance from the shore power inlet to the main circuit over current protection should be within a. 10' b. 12' c. 7" d. 72"

d. 35.7 amps

According to ABYC, maximum current carrying capacity of a 10 gauge wire, 105 degree C insulation, inside the engine room when bundled with 2 other current carrying wires would be? a. 60 amps b. 51 amps c. 42 amps d. 35.7 amps

a. 35.7 amps

According to ABYC, maximum current carrying capacity of a 10 gauge wire, 105 degree C insulation, inside the engine room when bundled with 2 other current carrying wires would be? a. 35.7 amps b. 60 amps c. 5I amps d. 42 amps

10'

According to ABYC, what is the maximum distance allowed between a boat's shore power connection and the main overcurrent protection device?

90 minutes

According to ABYC, what is the minimum battery reserve capacity?

B. Not be grounded on the boat

According to the ABYC, the shore-power grounded conductor should: A. Be connected to the AC neutral B. Not be grounded on the boat C. Be connected to the engine common positive terminal or its bus D. Be tied to the battery isolator

d. Both a & c are correct

After installing an alternator, a technician should: a. Check rotation of cooling fan b. Verify the voltage is less than 13 volts when engine is running c. Check that AC ripple is less than 0.5 VAC d. Both a & c are correct

c. Insulation temperature rating too low

All of the following could cause a conductor to overheat except. a. Undersize conductor b. Excessive amperage c. Insulation temperature rating too low d. Corroded connection

B. Inside an enclosure requiring the use of hand-tools to open

All terminations and junctions for AC conductors must be installed: A. in free air to allow for proper ventilation B. Inside an enclosure requiring the use of hand-tools to open C. In conduit D. In snap-covered junction boxes

b. 24.5 amps

Allowable amperage for AC conductors of 14 AWG, 105 degree C insulation, outside the engine spaces, when 2 current carrying conductors are bundled together is a. 35 amps b. 24.5 amps c. 20.8 amps d. none of the above

c. 285

Allowable amps less than 50 volts (not bundled). You have a cable that runs from a battery to a bow thruster. All components are in the forward cabin. The wire is good 105 C rated #0 AWG. How many amps can safely pass through that cable? a. 200 b. 242.3 c. 285 d. 330

D. Burned out 120V appliance

An "open Neutral" conductor in a 240V/120V shore power system will most likely show up as: A. Nuisance tripping of the AC main breaker B. Nuisance tripping of an appliance branch circuit breaker C. A loud humming noise emitted from the TV D. Burned out 120V appliance

d. 1 foot square

An adequate sized under-water lightning ground plate will have an area of at least: a. 10 square feet b. 4 square feet c. 2 square feet d. 1 foot square

d. Current Flow

An ampere is a measurement of: a. Power b. Resistance c. Potential to do work d. Current Flow

d. All of the above are correct

An electrical diode is a component that: a. Is found in alternators b. Is found in galvanic isolators c. Is found in battery isolators d. All of the above are correct

b. 2

An inverter or inverter charger must be installed at least ______ feet above normal accumulation of bilge water, or protected from bilge water splash. a. 1 b. 2 c. 3 d. 4

b. 125% (see E-11.10.2.5.1.1)

An isolation transformer shall have overcurrent protection rated at not more than _____ of the rated primary of the transformer. a. 100% b. 125% c. 135% d. 150%

d. Reverse Polarity

An overheated shore power connector problem could be caused by all of the following EXCEPT a. Corroded Connections b. Loose Connections c. Overload of the system d. Reverse Polarity

a. Are kept separate

At the AC distribution panels on boats the green and white wires... a. Are kept separate b. Are tied together c. Are cut d. None of the above

c. 2-450 CCA batteries in parallel (see E-11.6.1.2.1)

At what CCA do you have a disconnect switch? a. 1-450 CCA battery b. 1-650 CCA battery c. 2-450 CCA batteries in parallel d. 2-450 CCA batteries in series

1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction.

Batteries must be secured to prevent movement of more than ______ inches in any direction when a pulling force of _____ or _____, whichever is less, is applied through the center of gravity of the battery for how long?

Yellow

DC grounded conductors on new boats that are also equipped with AC systems should use what color insulated wire?

d. Yellow

DC grounded conductors on new boats that are also equipped with AC systems should use what color of insulation? a. Light Blue b. Black c. Red d. Yellow

80 F, 25 Amps, 10.5 Volts

Define: Battery reserve capacity = the number of minutes that a new, fully charged battery at ______ degrees F can be continuously discharged at ______ amps while maintaining _____ volts (for a 12 v battery)

0 degrees F, 30 seconds, 7.2V

Define: Cold Cranking Amps = the discharge load, in amperes, that a new, fully-charged battery at _____ degrees F can deliver for ______ seconds while maintaining a voltage of _____ volts (for a 12 v battery).

32 degrees F, 30 seconds, 7.2V

Define: Marine Cranking Amps = the discharge load, in amperes, that a new, fully-charged battery at _____ degrees F can deliver for ______ seconds while maintaining a voltage of _____ volts (for a 12 v battery).

As the motor heats up, winding resistance increases causing a corresponding decrease in current draw. Fire hazard. Thermal protection device recommended in motors!

Describe the reason why a locked-rotor motor may not trip an overcurrent protection device.

On diesels, the oil pressure sender may be used to switch alternator on/off and the trigger the tachometer.

Describe why a non-functional tachometer and charging system on a diesel engine may be caused by a failed oil pressure sending unit.

d. 90

Each installed battery shall not move more than one inch in any direction when pulling force of ______ lbs or twice battery weight is applied. a. 60 b. 70 c. 80 d. 90 e. 100

Overcurrent protection must be located withing 7 inches of the power source unless contained within a sheath, in which case it may be up to 40 inches away. If the power source is a battery and the conductors are sheathed, OC may be up to 72 inches away.

Explain the "7-40-72" rule

b. 16 ga. (see E-11.14.1.1.2 note: some 18 AWG exceptions exist)

For AC circuits, ABYC recommends that minimum conductor size shall be at least a. 14 ga. b. 16 ga. c. 18 ga. d. 20 ga.

600 Watts for 15-amp circuit, 1000 Watts for 20-amp circuit (E-11.13.3.4)

For a branch circuit supplying both receptacle loads and permanently connected loads, what is the maximum recommended permanent load for 15-amp circuit? For 20-amp circuit?

b. isolated by proper switching

For a single shore power installation with multiple inlets, all current carrying conductors shall be a. connected together b. isolated by proper switching c. connected through galvanic isolators d. connected directly to the AC buses

seven hours (E-11.10.1.3.1)

For how long must a motor be able to sustain a locked rotor condition without inducing a fire hazard?

d. use large cranking batteries

For proper inverter operation it is important to do all of the following except a. adequately size inverter output for connected loads b. provide AC overcurrent circuit protection c. provide DC overcurrent circuit protection d. use large cranking batteries

Peak Voltage = 1.414 * RMS Voltage or, V peak * .707 = V RMS

For true RMS inverters what is the relationship between peak and RMS voltage?

c. Main battery charger

From the choices provided which device would typically not be fed from an inverter's AC output? a . Microwave oven b. Galley lighting c. Main battery charger d. Refrigerator

c. Crossover cranking stud connected to cranking motor

Genset DC wiring shall meet all of the following requirements except a. E-11 DC electrical systems on boats b. Negative ground requirement c. Crossover cranking stud connected to cranking motor d. Current carrying parts of DC wiring attached to the engine are not required to have overcurrent protection.

A. Cooler

High frequency transformers typically run _____ than traditional magnetic transformers. A. Cooler B. Hotter C. Faster D. Slower

24 inches or more (unless waterproof!)

How far above bilge water level must a battery charger be mounted?

At least 24 inches

How far away from a gasoline tank must a pre-wired battery charger's AC connection plug be located?

d. 4

How many conductors may be attached to a single terminal stud? a. 1 b. 2 c. 3 d. 4

a. 15 amps

How much current should flow through the DC grounded conductor in a 15 amp DC lighting circuit? a. 15 amps b. 0 amps c. 10 amps d. None of the above

b. 0 amps

How much current should flow through the DC grounding conductor in a 25 amp DC motor circuit. a. 25 amps b. 0 amps c. 10 amps d. 5 amps

Every 18 inches.

How often (in inches) shall wire bundles be supported?

A. Polarity check of shore cord

If a customer complains about receiving shocks from her boat when shore power is active, the technican should first test: A. Polarity check of shore cord B. Polarity check of the battery system C. Current Leakage Test D. Converter voltage check

a. polarity check of the shore cord

If a customer complains about receiving shocks from his/her boat when the boat is plugged into shore power, the first test should be a a. polarity check of the shore cord b. polarity check of the battery system c. voltage check d. converter voltage check

b. check shore power connections

If a customer complains of low voltage at the AC Panel while at the dock, the technician should first a. recalibrate the panel meter b. check shore power connections c. check polarity indictor d. replace the overcurrent protection device

B. 120% (see E-11.6.2.3.2)

If a generator is not self limiting, the power feeder conductor from the generator shall be sized to accommodate the generator's maximum rated output and shall be protected at the generator with overcurrent protection devices whose rating shall not exceed of the generator rated output . A. 100% B. 120% C. 125% D. 150%

a. have a fire suppression access port

If a generator set is equipped with a sound shield, the shield shall a. have a fire suppression access port b. have a minimum sound intensity of 77dB as measured on the decibel C scale inside the occupancy spaces of the vessel. c. Provide access to raw water pump drive belt without the need for hand tools. d. Not have screens, baffles, grilles or other means to prevent accidental contact with moving parts.

b. a GFCI device

If installed in a head, galley, machinery space, or on a weather deck, a receptacle shall be protected by a. a GPF device b. a GFCI device c. an isolation transformer d. a polarization transformer

d. 150% (see E-11.10.2.6, exception)

If there is not a standard current rating overcurrent protection device equal to 100% of the allowable current for an AC branch circuit, the next larger standard current rating may be used provided it does not exceed _______ of the maximum allowable current . a. 100% b. 125% c. 135% d. 150%

d. The total current will decrease

In a series circuit, the more resistive loads you add: a. The total voltage will increase b. The total current will increase c. The total voltage will decrease d. The total current will decrease

b. break before make transfer switch

In order to eliminate the neutral to ground connection when shore power is being transferred through the inverter a ________ is utilized. a. make before break transfer switch b. break before make transfer switch c. manual disconnect switch d. battery selector switch

b. The resistivity of copper

In the formula for circular mils, for our purposes "K" is equal to 10.75. What does this number represent? a . The wire thickness b. The resistivity of copper c. The rating of the wire insulation d. Black Magic

d. All of the above

Inverter output neutral shall be disconnected from ground at the inverter when: a. Inverter is operating as a charger b. Inverter is operating as a transfer device c. Inverter is operating in pass through mode d. All of the above

b. 600 V

Minimum AC conductor Voltage rating is: a. 300 V b. 600 V c. 1200 V d. 150 V

C. Between 150% and 200%

Most engine-driven alternators are optimally spun at what percentage of engine RPMs? A. Between 10% and 50% B. Less than 10% C. Between 150% and 200% D. Greater than 200%

b. 10.5 Volts

Most marine inverters will shut down automatically when battery voltage falls below what voltage? a. 9.7 Volts b. 10.5 Volts c. 11.7 Volts d. 12 Volts

a. wire nuts

Multi wire plugs and receptacles used in conjunction with harness type wiring systems shall incorporate means except: a. wire nuts b. molded connectors c. insulation grips d. extended terminal barrels e. all the above

Shore power Pylon Inverter (when inverting) Genset Isolation Transformer

Name the 4 places in marine electrical power where we have a neutral-ground connection.

Styrene from curing fiberglass, methane from head/holding tank, hydrogen from battery outgassing or refrigeration leaks

Name three common gasses other than CO that may trigger a CO alarm:

Excessive humidity, low supply voltage

Name two likely possible causes of falsely trigger fire alarm in an engine room space.

c. Checking voltage drop when engaging starter motor (Calder p. 78)

Of the following which is NOT a correct way of testing a battery. a. Use a load tester b. Keep track of amps going in and out with an amp hour meter c. Checking voltage drop when engaging starter motor d. Measure open circuit voltage

B. Faulty exciter winding / diode rectifier circuit

On a brushless generator, a possible cause for low AC voltage output under load could be: A. High engine RPM B. Faulty exciter winding / diode rectifier circuit C. Faulty output circuit breaker D. Excessively high DC voltage supply

shorter, thicker terminal is HOT taller, narrower terminal is NEUTRAL

On a standard 3-conductor AC outlet, which of the two blade conductors (i.e., not the rounded GROUNDING conductor) is Hot and which is Neutral?

c. 90 minutes

On a vessel with 1 charging source ABYC requires sustaining DC loads for _____ minutes: a. 30 b. 60 c. 90 d. 120

1 HP = 746 Watts

One HP = how many watts?

b. Excessive frequency

Overheating at a junction point in the AC distribution panel can be caused by all of the following EXCEPT a. Loose terminal b. Excessive frequency c. Excessive load d. Improperly sized conductor

800 CCA or 100 Ahr (exceptions: electronic equipment with battery backed memories; safety equipment such as bilge pumps, alarms, CO detectors, bilge blowers; battery chargers; I'm pressed current systems.

Per ABYC E-10, a battery switch must be installed in the positive conductor from each battery bank with a CCA rating greater than ____ (or greater than _____ Ah if CCA rating not available).

d. A factory installed length of wire included with a piece of equipment

Pigtails less than 7 inches (175mm) in length are exempt from overcurrent protection requirements. A pigtail is defined as: a. A factory molded cord set for shorepower. b. A length of wire (less than 7") installed by technician to a piece of electronic equipment c. The factory wiring attached to a bilge pump - d. A factory installed length of wire included with a piece of equipment

d. hot and neutral

Reverse polarity is defined as reversed connection of which circuits? a. neutral and ground b. Line 1 and Line 2 c. hot and ground d. hot and neutral

d. 72"

Sheathed ungrounded conductors connected directly to a battery must have overcurrent protection devices located within inches of the connection to the battery. a. 7 " b. 36" {slightly less than 1 meter) c. 40 " d. 72"

c. remotely activated switches

Solenoids are often used as: a. resistors b. capacitors c. remotely activated switches d. voltage regulating devices

a. Conductance tester

Some battery manufactures will only consider warranty claims on batteries whose condition has been determined by use of a a. Conductance tester b. Load tester c. Hydrometer d. Megohmmeter

d. 30 amps

Standard shore power is a. 35 amps b. 50 amps c. 25 amps d. 30 amps

Closed when in neutral (therefore, an open-circuit failure would prevent engine starting)

Start-in-gear protection switches should be open or closed when in neutral?

c. 6 " (A-31.6.1)

Strain relief shall be provided for all wiring passing through the battery charger case to relieve strain on terminals, splices or internal wiring. Unless a strain relief method is integral with the case for wiring passing through, a means to achieve strain relief shall be installed within inches of the case. a. 3 " b. 5 " c. 6 " d. 10 "

False. the battery charger case shall be tied to the engine negative terminal/bus, along with the negative output terminal of the battery charger, not at the battery charger case itself.,

T or F: A battery charger case shall be tied to the DC negative output terminal at the battery charger.

True

T or F: A shunt is a conductor of known resistance placed in series with a circuit to indicate current flow by measurement of the voltage drop across this conductor.

True

T or F: A visible means [voltmeter, light, etc] of determining an inverter is "online or in standby mode" must be installed at the main AC electrical distribution panel.

False. (only when installed in location that required GFCI per ABYC E-11)

T or F: All marine inverters shall utilize an internal or external GFCI on their AC outlets.

True

T or F: An acceptable way to check for loss of ground in an AC circuit is to plug a light bulb into a receptacle's hot and ground.

False. Anode is negative, Cathode is positive

T or F: An anode can be defined as an electrode of a supplied-current cell which is connected to the positive terminal of a DC current source .

False. Shore power neutral is tied to ground on the shore side.

T or F: Because the shore power connection is a power source, the neutral conductor should be tied to ground at the point where it comes in to the boat (shore power cable connection)

True

T or F: Boats that have an inverter installed must have a warning label noting such at the main electrical panel

True

T or F: Branch circuit breakers may open only the ungrounded conductor if the AC system on the boat is equipped with a reverse polarity indicator or input circuit isolation transformer.

False

T or F: CO detectors will also detect smoke in most situations.

False. Start batteries have a greater number of thinner plates within each cell.

T or F: Compared to deep cycle (house) batteries, cranking batteries will have thicker lead plates to facilitate the higher, short-duration current draws.

True

T or F: For AC wiring, the "hot" ungrounded conductor (i.e., not the insulation color) should be brass or copper colored and the "neutral" grounded conductor should be light silver colored.

True (provided the generator's self-limiting current, AKA "overload current", does not exceed 120% of it's rated current output)

T or F: Generators that are "self-limiting" do not require overcurrent protection if the conductors used are of sufficient ampacity and sized for maximum current available.

False

T or F: It is ok to combine different types of batteries as long as they are all of the lead-acid type (i.e. Gell Cell, SLA, AGM, Etc.)

True.

T or F: On an AC and DC combined panel that it affixed with screws, the energized AC parts on the back of the panel must be covered.

True

T or F: Pigtails less than 7 inches (175mm) in length are exempt from overcurrent protection requirements.

True

T or F: Running AC and DC conductors together is allowed so long as the AC conductors are sheathed.

True

T or F: Solid (non-stranded) conductors are not allowed for AC wiring anywhere on a boat.

False - the "L" shaped prong is Ground

T or F: The "L" shaped prong on a 20 amp shore power cord is the black or "hot" wire.

True (E-11.14.1.3.7.2)

T or F: The AC grounding conductor shall be permitted to be one size smaller than the current carrying conductors on circuits rated greater than 30 Amps

True

T or F: The metallic braid of a coaxial cable and metal conduit used for radio interference shall be connected to earth ground with an insulated stranded copper conductor

False, they must be isolated to prevent shock hazard at the unutilizd shore power connector pins.

T or F: When more than one option for shore power inlet is installed on a boat, the shore power neutrals shall be tied together on the boat.

True

T or F: boats with an enclosed accommodation compartment shall have an audible high bilge-water alarm.

True

T or F: if no standard rating OC protection device is available which equals 100% of the allowable current for the conductor being protected, the next larger rating, up to 150% of the conductor ampacity, may bee used - unless the load is a motor.

True

T or F: if power disconnect switch is in excess of 10 feet, over-current protection is required

True

T or F: it is ok to install batteries directly below an uninterrupted fuel line?

False. "Readily accessible" defines entry into the engine room in an emergency as dangerous - use a remote battery switch.

T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes that it must be located as close to the batteries as practical.

False. Auto-reset is not allowed.

T or F: magnetic transformers with integrated secondary-side overcurrent protection and automatically resetting thermal overload protection are ABYC compliant.

True

T or F: metal AC panel boards must be grounded.

False. Most are not ignition protected.

T or F: most GFCI outlets can be used in a gasoline engine room

True

T or F: when installing a remote solenoid for switching high-current draws like windlass, bow-thruster, etc, a separate appropriately sized overcurrent protection must be in place for both the low-current and high-current wiring of the solenoid.

a. Technician A

Tech A says AC & DC are able to run down the same conductor. Tech B says this is technically impossible. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

Tech A

Tech A says that AC and DC are able to run together down the same conductor. Tech B says this is technically impossible. Which is correct, A, B, neither or both?

B. Tech B

Tech A says that combined AC/DC panel boards are grounded via the DC negative bus. Tech B says that such panel boards should be grounded to the AC grounding bus. Which tech is right? A. Tech A B. Tech B C. Both techs are correct D. Neither tech is correct

b. Technician B

Tech A says that combined AC/DC panels 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? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

a. Tech A

Tech A says that lightening protection must not have a bend over 90 degrees. Tech B says that a total of 90 degrees must not be exceeded. Who is correct? a. Tech A b. Tech B c. Both Tech A and Tech B d. Both are incorrect

Both.

Tech A says that voltage supplied to the rotor controls the alternator output voltage. Tech B says that the alternator output is proportional to the rotor voltage. Which is correct, A, B, Both or Neither?

A. Tech A

Tech A says the ABYC has pull-test requirement for wiring connecting the generator to onboard circuits. Tech B says pull-test requirements are dictated by the generator manufacture. Which one is correct? A. Tech A B. Tech B C. Both Techs D. Neither Tech

a. Technician A

Technician A says double pole circuit breakers must be used to provide Overcurrent protection for both the ungrounded and grounded conductors of an AC input circuit. Technician B says simultaneous opening fuses may be used for this application. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

a. Technician A

Technician A says generator output loads should be balanced between legs. Technician B says as long as total output load is below the maximum rated output no balance requirement exists. Which response is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

b. Technician B

Technician A says gensets must have an independent self-priming pump for the cooling system. Technician B says if the genset has a dry stack exhaust it is not required to have an independent pump for the cooling system. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

c. Neither A nor B

Technician A says inverter AC backfeeding is caused by improper switching of an external power source. Technician B says that backfeeding is caused by DC reversed polarity. Which technician is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

b. Technician B

Technician A says overcurrent protection for the main shore power feeders must be with 7" of the source of power (the hull inlet connector) or 40" if the wires are sheathed or otherwise protected. Technician B says the main shore power disconnect breaker must be within 10' of the inlet to the boat. Which is correct? a. Technician A b. Technician B c. Neither A nor B are correct d. Depending on other conditions, both may be correct.

b. Technician B

Technician A says that AC circuit overcurrent protection devices shall not exceed the maximum current carrying capacity of the conductor being protected. Technician B says it is allowable to go up to 150% over the current allowed in table VI A-C of E-11. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

a. Technician A

Technician A says that a generator's neutral and ground must be connected together at the generator. Technician B says that they must be kept separate. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

a. Technician A

Technician A says that a generator's neutral and ground must be connected together at the generator. Technician B says that they must be kept separate. Which technician is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

d. Both A and B (see E-11.9.3.2)

Technician A says the AC system wiring must include a voltmeter installed on the main panelboard if the system wiring is permanently connected to a genset. Technician B says a voltmeter must be installed if the genset is connected to any permanently installed motor or inverter circuit. Which is correct? a. Technician A b. Technician B c. Neither A nor B d. Both A and B

B. Tech B

The A says the a faulty circuit breaker could require an overhaul. Tech B says that circuit breakers used in recreational marine applications must be replaced if found defective. Who's right? A. Tech A B. Tech B C. Both may be correct, depending on circumstances D. Neither

d. 15.0 amps

The current flowing through a 120 volt AC heating element at 1800 watts is a. 0.5 amps b. 1.0 amps c. 5.0 amps d. 15.0 amps

d. All of the above are likely causes

The customer reports that the generator will not crank from either the local or remote control panel. Which of the following are likely causes? a. low battery voltage b. bad starter solenoid c. faulty start switch on the remote panel d. All of the above are likely causes

D. 135% (see A-31.6.5.1.2, exception)

The inverter DC grounding conductor may be one size smaller than than the minimum size conductor required for the DC current carrying conductors providing the overcurrent protection device in the DC positive conductor is rated no greater than __________ of the ampacity of the DC grounding conductor and the conductor is no smaller than 16 AWG. A. 100% B. 120% C. 125% D. 135%

c. 125 (see E-11.10.2.5.1.1 and E-11.10.2.5.2)

The maximum allowable overcurrent protection rating for either the primary or secondary side of an isolation transformer is _____ % a. 100 b. 120 c. 125 d. 150

B. 3%

The maximum allowable voltage drop permitted for panel board DC feeders is: A. 2% B. 3% C. 10% D. 15%

B. 3%

The maximum allowable voltage drop permitted for panelboard DC feeders based on ABYC is: A. 2% B. 3% C. 10% D. 12%

d. 4

The maximum number of terminals to be attached to any one terminal stud based on ABYC Standard is: a. 1 b. 2 c. 3 d. 4

C. 14.1 V

The maximum sustained charging voltage acceptable to some gell cell battery manufacturers is: A. 13.8 V B. 14.5 V C. 14.1 V D. 13.2 Vll

B. 90 min

The minimal battery reserve capacity in minutes for a supplied battery power, based on ABYC. A. 30 min B. 90 min C. 120 min D. 200 min

b. 15 amps

The minimum amp circuit breaker that should be used to protect a 120 volt water heater with a 1600 watt element would be rated at ______ amps . a. 10 amps b. 15 amps c. 20 amps d. Overcurrent not listed

a. 15

The minimum amp circuit breaker that should be used to protect a 120VAC water heater with a 1600 watt element would be rated at ________ amps. a. 15 b. 10 c. 30 d. 20

b. 2" (E-11.14.4.1.6)

The minimum space for conductor runs near water-cooled enigine exhaust is a. 1" b. 2" c. 4" d. 9"

C. Unwanted open

The most common electrical circuit problem in marine applications is: A. Short circuits B. Too much continuity C. Unwanted open D. Inter circuit Short

d. All of the above

The neutral for AC power sources shall be grounded at which point? a. through the shore power cable and shall not be grounded on board the boat. b. Generator neutral shall be grounded at the generator c. Inverter neutral shall be grounded at the inverter when inverter is producing AC power. d. All of the above

a. 5 mA

The nominal trip rate for GFCI receptacles in the US is: a. 5 mA b. 10 mA c. 15 mA d. 30 mA

D. No device allowed (see E-11.5.5.5)

The overcurrent protection device that shall be installed on the AC grounding (green) conductor has a current rating of ____________ of the conductor's rated ampacity. A. 100% B. 125% C. 150% D. No device allowed

D. Heat

The primary by-product of excessive electrical resistance is: A. Increased Amperage B. Increased Voltage C. Reduced Ambient Temperature D. Heat

b. between the hull inlet connector and the grounding wire inside the boat

The recommended circuit location to install a galvanic isolator is between the a. AC grounding bus and the DC negative b. between the hull inlet connector and the grounding wire inside the boat c. AC neutral and AC grounding bus d. None of the above

c. Megohmmeter

The tool of choice for testing AC generator winding insulation integrity is a: a. TDR b. Fox and Hound c. Megohmmeter d. Clamp Type ammeter

c. Greater than or equal to 25,000 ohms.

The total impedance of polarity indicating and protection devices connected between normal current carrying conductors and the grounding conductor (green wire) shall be: a. This is a bad question as there should be no connection between the grounding and neutral conductors in any place other than at a source of power. b. No greater than 1 ohm. c. Greater than or equal to 25,000 ohms. d . None of the above.

b. Make sure the field wire has appropriate voltage when engine is running

To check a voltage regulator is working properly, the best thing a technician can check: a. Make sure the unit has 12 volts when engine is running b. Make sure the field wire has appropriate voltage when engine is running c. Make sure it's LED indicator lights come on d. You cannot test a voltage regulator without sending to the factory for certified bench testing

d. AC output

To check an inverters _________ a technician may need a true RMS meter: a. DC input b. DC output c. AC input d. AC output

d. when in invert mode

To comply with ABYC requirements, a Neutral to Ground connection must be present at the inverter during which of the following conditions: a. when in charge rnode b. when in standby mode c. when in transfer mode d. when in invert mode

C. Continuity

To test a 120V AC element in a hot water heater, the tech may run a _____ test. A. Voltage B. Capacitance C. Continuity D. Inductance

c. Continuity

To test a 120VAC element in a water heater the technician may run a test. a. Voltage b. Capacitance c. Continuity d. Inductance

d . Gaussmeter

Tool of choice for determining an inverters level of EMI is the: a . DVOM b. Wattage meter c. Oscilloscope d . Gaussmeter

False

True or False: AC receptacles may be used for DC service, provided they are properly labeled.

b. Technician B

Two technicians are discussing increasing the number of traditional lead-acid golf cart batteries on a customer's vessel from 4 to 8. Both technicians agree that batteries have to be accessible for inspection and maintenance according to the NFPA. Technician A says that the batteries must be in a vented box and secure. Technician B says that boxes are not necessary and a sealed composite tray matching what the boat already has would be fine and looks better. Who is correct? a. Technician A b. Technician B c. Both A & B are correct d. Neither

d. Neither are right.

Two techs are rewiring an old sailboat. Tech A says they should use all series circuits to keep the wiring clean and simple. Tech B says series circuits should only serve a single load. Who is correct? a . Tech A b . Tech B c. Both are right. d. Neither are right.

e. Both a and d

Under certain circumstances, ABYC requires that a metallic shorepower Inlet receptacle be insulated from the hull. When is that required? a. When an isolation transformer is used b. When no reverse polarity light is provided c. When the boat is not bonded d. When a galvanic isolator is installed e. Both a and d

d. Under no circumstances is this permitted

Under which condition may a genset with non ignition protected components be installed in a compartment containing a gasoline propulsion engine? a. the compartment is ventilated in compliance with ABYC E-11 b. the compartment is equipped with automatic fire suppression system. c. The compartment contains a vapor detector d. Under no circumstances is this permitted

b. 16 AWG

Using the circular mills formula, what size wire would you need for a green, 96 watt running light that is 16' away from the distribution panel in a 24 volt vessel. a. 18 AW G b. 16 AWG c. 14 AWG d. 2/0 AWG

a. At both ends of the cable

Voltage drop could be used to test for a bad starter cable. To test the cable a technician would use the DVOM and check voltage at what two points? a. At both ends of the cable b. The battery terminals c. The positive cable at starter and engine block (ground) d. At the starter solenoid and engine block (ground)

D. TDR

Wha is the best tool to use for locating short-circuits? A. Megger B. Amp Clamp C. DVM D. TDR

At least 135% of isloator's nominal rating. (A-28.11.1)

What ampacity is required for wire and terminals connecting a galvanic islolator?

Class T fuse rated for appropriate AIC

What device is typically found to satisfy the required OC protection between a battery charger and the batteries?

Resetting mechanism cannot overrid over current interrupting mechanism. (Note: some residential breakers are not trip free)

What does "trip free" breaker mean?

c. The breaker will trip out regardless of conditions

What does "trip free" circuit breaker mean? a. The breaker is inexpensive b. The breaker will have lots of nuisance trips c. The breaker will trip out regardless of conditions d. The breaker will only trip at 150% of its rated amperage

4 AWG

What gauge wire is required at a minimum for the primary down conductor from a lightning Air Terminal?

6 AWG

What gauge wires is required for lightning protection system secondary conductors?

d. Baking Soda

What household item is used to neutralize battery acid? a. WD 40 b. Baking Powder c. Bleach d. Baking Soda

D. All of the above are possible

What is a likely cause of non-functioning galvanic isolator? A. a shorted isolator diode B. Improper current rating of the isolator diode C. An on-board neutral-to-ground connection D. All of the above are possible

b. There could be severe radio interference from the new device.

What is a possible problem with installing a new solid state Voltage regulator to replace a manual one? a. Overcurrent protection will have to match new amperage draw from device. b. There could be severe radio interference from the new device. c. Reverse influx could result, and diodes will have to be installed to modify voltage flow. d . None of the above

Equipment Leakage Current Interrupter - within 10 feet of shore power connection unless an isolation transformer is located within 10' of shore power connection.

What is an ELCI and where is it required to be installed?

b. 210

What is the allowable amps of a single #2 AWG conductor outside the engine space, rated at 105 C? a. 178.5 b. 210 c. 147 d. 126

b. Use corrosion block

What is the best way to prevent corrosion on a battery cable a. Use WD 40 b. Use corrosion block c. Heat shrink the entire battery post d. Use pure copper lugs

b. 12" (see E-10.7.8)

What is the closest distance an unshielded metallic fuel system component can be to a battery terminal? a. 8" b. 12" c. 16" d. 24"

c. It should read '0' VDC

What is the expected voltage across a 'closed' switch that is operating properly a. It should read current battery voltage b. It can be up to 10% less than battery voltage c. It should read '0' VDC d. Not enough information provided

a. 120 volts AC

What is the expected voltage when measured between Hot and Neutral for a 120 Volt AC circuit? a. 120 volts AC b. 120 Volts DC c. 0 Volts AC d. None of the Above

Ampacity < 20 Amps, voltage drop across terminals < 50 mV @ 20 A flow, no separation with a one-minute pull of 6 lb force.

What is the general rule for use of friction connectors?

8 AWG

What is the largest guage wire that may be connected to a bettery with wing-nuts?

36 inches

What is the max allowed unsupported cable length for battery cables?

2-3%

What is the max typically allowable % difference between true sinusoidal peak AC voltage and harmonically distorted peak AC voltage?

30 mA, 100 ms

What is the maximum allowable trip current & time for ELCI/RCD at the main shore power input?

1 sq. ft.

What is the minimal required surface area for lightning protection system's immersed ground plate?

No smaller than 1 size below the DC current carrying conductors between the charger and batteries - provided OC protection on positive DC output is no greater than 135% of DC grounding cable ampacity and conductor is no smaller than 16 AWG.

What is the minimal wire size required for a battery charger case connection to DC ground/engine negative?

AIC = 5000 Amps (E-11 table IV-A)

What is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery bank rated at 12 V, 1500 CCA?

AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating.

What is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery bank rated at more than 2200 CCA or more than 500 Ahr?

75 C (167 F) (E-11.14.1.1.3)

What is the minimum insulation temperature rating for conductors routed inside an engine room?

50 VDC (E-11.14.1.2.1)

What is the minimum voltage rating for all DC conductors?

D. TDR (time-domain reflectometer)

What is the preferred tool for tracing shorted and open circuits? A. Ohm meter B. Amp clamp C. Volt meter D. TDR (time-domain reflectometer)

6 lbs for 1 minute (E-11.13.2.3)

What is the pull-test requirement for DC plug/receptacles?

16 AWG

What is the smallest guage wire allowed for unsheathed wire runs through the boat?

c. Metal

What material is recommended for clamping conductors over engines and moving machinery according to ABYC a. PVC b. Nylon c. Metal d. Any of the above will work

Batteries will feed back into solar array or wind generator coil and discharge (possibly damage). Note: many voltage regulators have integral blocking diodes.

What may happen to a solar array or wind generator used to charge batteries without a blocking diode?

The sub-panel breaker's trip point shall be no greater than 100% of the total current draw for the entire sub-panel.

What must be true of a sub-panel input circuit breaker's rating such that the main breaker may be sized up to 150% of the sub-panel feeder conductor's ampacity?

Must be protected with dielectric insulating material

What provision must be in place on any fuel line located within 12 inches of a battery terminals?

40 lbs (E-11 Table XV)

What tensile force must a 10 Gauge crimp connector withstand for one minute?

Wire brush and backing soda.

What tool and common household staple are used to clean battery terminals?

Mega ohm meter (AKA "merger"), 1 M Ohm

What tool is used to test the insulation integrity of a generator windings and what is the generally accepted Mimimal measurement?

Insulated Metallic Hanger Clamps

What type of clamps are to be used for supporting wire bundles when routed over engines and machinery?

c. Green #8

What wire is best suited for bonding under-water components: a. Black or Yellow or green #8 b. Black or Yellow #8 c. Green #8 d. None of the above

a. test with an RMS voltmeter

When a customer complains of low inverter AC output voltage, the first thing the technician should do is: a. test with an RMS voltmeter b. replace the inverter c. test with a calibrated averaging voltmeter d. readjust the customer's voltmeter

a. connected to the boats AC ground

When an inverter is producing AC power, the inverter output neutral conductor should be a. connected to the boats AC ground b. floating above ground c. greater than 25,000 ohms below ground d. greater than 25,000 ohms above ground

1500 Watts / 20 A circuit (E-11.8.2.2.1.2)

When calculating AC loads for small galley appliances, how many watts should be used for each 20 amp circuit?

2 Watts / sq. ft. (E-11.8.2.2.1.1)

When calculating AC loads, what is the recommended wattage per square foot of living area?

d. When installed immediately under a split lock washer and nut. (see E-10.8.5)

When can a flat washer be used on a battery terminal? a. When it has a resistance of less than .01 ohms b. When installed immediately under a wing nut c. When installed in between the base of the battery terminal and the conductor terminal. d. When installed immediately under a split lock washer and nut.

c. When connected in series AmpHrs is increased.

When combining batteries in DC installation, which statement is NOT true. a. two 12 volt batteries connected in series will give 24 volts. b. two 12 volt batteries connected in parallel will give 12 volts c. When connected in series, AmpHrs is increased. d. When connected in series, AmpHrs stays the same.

d. All of the above

When completing a job after a partial rewiring of a customer's boat, the technician should: a. Update the boat's wiring diagram b. Test the operation of the system c. Explain all of the changes to the owner d. All of the above

a. Isolate the grounding system from the main ship grounding system. (see E-30.5.2)

When grounding an electrical propulsion system you should always remember too... a. Isolate the grounding system from the main ship grounding system. b. Install a blocking diode between it and your main ground bus. c. Tie your ground into your bonding system. d. Combine it with your main grounding system.

D. None of the above

When installing a starter over current protection must be within inches of the battery. A. 7" B. 40" C. 72" D. None of the above

d. Wind direction indicator

When installing a wind generator, the technician must consider all of the following except: a. Safe height above the deck b. Use of blocking diodes c. Voltage regulation d. Wind direction indicator

> 25 degrees above ambient

When measuring temperature to determine potential electrical issues involving excessive connector resistance, what is the threshold for concern?

a. not connected together

When more than one shore power inlet is installed, ABYC recommends that the neutrals are a. not connected together b. connected together c. connected to AC grounding bus d. connected to DC grounding bus

24 inches (E-11.14.1.3.7.1)

When multiple DC conductors are bundled together for a distance of greater than ____ inches, the allowable ampacity of each conductor must be derated based on the table found within standard E-11

a. On the deep-cycle side

When simultaneously recharging two different types of batteries (house & start) with diode type battery isolator, where is it best to sense the voltage for charging source? a. On the deep-cycle side b. On the cranking battery side c. Sense both together d. Either side, does not matter

d. All of the above

When testing a battery, the hydrometer is used to test a. State of charge b. For bad cells c. Specific gravity d. All of the above

50%

When testing a fully charged start battery for capacity with a load tester, what % of CCA rating should be induced by the load to test resulting voltage?

1.260 - 1.285 (temperature dependent)

When testing a wet-cell battery with a hydrometer, what reading indicates a fully charged battery?

0.050 points of specific gravity below other cells = bad cell.

When testing a wet-cell battery with a hydrometer, what threshold is used to determine a bad cell?

b. 0.4 V

When testing an alternator, the maximum AC ripple reading to ensure minimal RFI interference should be: a. 0.2 V b. 0.4 V c. 1.0 V d. 4 V

c. To have 12 volts with a keyswitch

When troubleshooting a charging problem with a voltage regulator, a technician should find the brown wire: a. To provide AC signal for the tachometer b. To have between 0 and 12 VDC c. To have 12 volts with a keyswitch d. Any of the above will work

c. 6 volt, 440 amp/hr

When two 6 volt, 220 amp/hour golf cart batteries are connected in parallel, the resulting output is: a. 6 volt; 220 amp/hr b. 12 volt, 220 amp/hr c. 6 volt, 440 amp/hr d. 12 volt, 440 amp/hr

d. 12 volt, 220 amp/hr

When two 6 volt, 220 amp/hour golf cart batteries are connected in series, the resulting output is: a. 6 volt, 440 amp/hr b. 6 volt, 220 amp/hr c. 12 volt, 440 amp/hr d. 12 volt, 220 amp/hr

D. A neutral-to-gound link at the boats AC panel board

When using a high-resolution amp clamp on a shore power cord and activating AC circuits one by one, the technician notes that the AC leakage current measured increases with each appliance. This most likely indicates: A. An open-circuit in the grounding conductor on the dock B. Excessively high voltage delivered by the utility company C. Excessive voltage drops in the AC power supply to the boat D. A neutral-to-gound link at the boats AC panel board

c. A-31

Which ABYC standard refers to the fuse in the DC positive conductor for inverter/battery charger output protection? a. A-25 b. A-27 c. A-31 d. A-34

a. AC induction motors

Which AC equipment should not run & will be damaged from a 'square' or 'modified' wave inverter a. AC induction motors b. Flatscreen T V c. Printers d. AC halogen lighting

b. shuts down for low voltage output condition

Which is NOT a correct statement regarding the automatic shut-down device for a permanently installed Genset? a. shuts down for excessive coolant temperature b. shuts down for low voltage output condition c. shuts down for low oil pressure d. shuts down for loss of exhaust coolant

d. blocking mode

Which is not a correct mode of operation of an inverter? a. inverting mode b. transfer mode c. charging mode d. blocking mode

e. Answer C & D are correct

Which is the primary function of a converter? a. Convert AC to DC b. Convert DC to AC c. Convert DC to DC d. Act as a fixed voltage DC power supply e. Answer C & D are correct

b. Convert DC to AC

Which is the primary function on an inverter? a. Convert AC to DC b. Convert DC to AC c. Act as a fixed voltage DC power supply d. None of the above

b. Group 4D

Which of the following battery has the largest case or physical size of the battery case? a. Group 24 b. Group 4D c. Group 31 d. Cannot determine without knowing the CCA

d. directly over batteries

Which of the following is not a correct installation practice for an inverter installation? a. a ventilated dry, accessible location b. where ambient temperature does not exceed 30 degrees C c. away from heat sources such as dry exhaust d. directly over batteries

a. block DC current

Which of the following is the function of a galvanic isolator? a. block DC current b. block AC current c. block fault currents d. reduce galvanic noise

d. both a and c

Which of the following metals may exhibit two distinct corrosion potentials (and occupy two different positions on the galvanic scale) depending on the composition of the electrolyte, other environmental factors, and/or surface conditions of the metal itself? a. Type 316 stainless steel b. Silicone bronze c. Type 304 stainless steel d. both a and c

a. Transfer from one AC power source circuit to another shall be made by a make before break type switch

Which of the following statements is NOT TRUE: a. Transfer from one AC power source circuit to another shall be made by a make before break type switch b. A means for disconnecting all power sources from the load shall be provided at the same location c. Individual circuits shall not be capable of being energized by more than one source of electrical power at a time d. Each shore power inlet, generator, or inverter is a separate source of power.

Cranking

Which type of battery generally recharges faster? Deep cycle or cranking?

d. 50 - 85%

While out cruising (away from the dock), batteries on a typical cruiser have what percentage of charge? a. 0 - 100% b. 25 - 75% c. 50 - 100% d. 50 - 85%

In case of an internal short to the case, the AC grounding wire would not carry enough current.

Why do battery chargers require a separate case connection to main AC grounding bus and Engine negative / DC grounding bus?

Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in the electrolyte.

Why might a fully-discharged wet-cell type battery freeze?

a. low engine speed

With the generator running and AC output frequency is low, what is the probable cause? a. low engine speed b. low exciter voltage c. high exciter voltage d. defective output circuit breaker

11.4 Amp current draw, use 15 Amp breaker

You are installing a 220 volt electric heater in a boat. The heater is rated at 2500 watts. How many amps will it draw? What size circuit breaker would you use?

c. 200 amps

You have a customer with an 800 Ah 'house' battery bank who wants to recharge with the biggest amount of amperage he can. Standard flooded batteries are being used. a. 5O amps b. 1OO amps c. 200 amps d. 400 amps

b. 8 AWG (using E-11 Table IX, 3% voltage drop, 40' total distance, 10 Amps)

You're installing a 500 GPH bilge pump to be used as a shower pump (just to drain the shower grey-water). It draws 8 amps, is 20' from the distribution panel, and operates at 12 volts. Using the ABYC voltage drop table, what size wire is needed? a. 14 b. 8 c. 10 d. 12

b. The total current will increase

in a parallel circuit, the more resistive loads you add: a. The total voltage will increase b. The total current will increase c. The total voltage will decrease d. The t o t a l current w i l l decrease

d. all of the above

lf a separate, independent AC powered battery charger is fitted along with an inverter/charger, the independent AC powered charger must be: a. fitted with output protection fuses to protect the DC output b. not be powered when the inverter is producing AC c. fitted with an AC case grounding wire d. all of the above

c. 125% (see E-11.10.2.8.3.1)

lf fuses are used in addition to the main shore power disconnect circuit breaker, their rating shall be such that the circuit breakers trip before the fuses open the circuit, in the event of overload. The ampere rating of the additional fuses shall not be greater than ________ percent of the rating of the main shore power disconnect circuit breaker. a. 100% b. 120% c. 125% d. 135%

b. 8 amps (E-11 Table XII Conductor Ampacity - Flexible Cords)

maximum current carrying capacity for an flexible cord of 16 AWG with 2 current carrying conductors inside the engine spaces is a. 6 amps b. 8 amps c. 10 amps d. 20 amps