ABYC Advanced Pretest with correct answers
A metallic shore power inlet becomes hot to the touch. Which would not be a contributing factor? - Answer-Temperature rating of shore-cord insulation
/.An inter-circuit short can cause: - Answer-" All of the above; Unrelated circuits to operate s...
A metallic shore power inlet becomes hot to the touch. Which would not be a
contributing factor? - Answer-Temperature rating of shore-cord insulation
/.An inter-circuit short can cause: - Answer-" All of the above; Unrelated circuits to
operate simultaneously; Components to work at reduced capacity; An over-current
situation"
/.Which of the following is addressed by ABYC A-32? - Answer-Power conditioning and
conversion
/.LED navigation lights are required to meet: - Answer-72 Colregs
/.Which of the following are recommended for 3-phase shore power? - Answer-Power
conditioning and phase-rotation monitoring
/.Which of the following is an example of a power-quality issue? - Answer-Nuisance
tripping of magnetic circuit breakers
/.What tool can be used instead of a power-quality analyzer to measure phase
amplitude? - Answer-DVOM
/.All of the following are functions of a generator voltage regulator EXCEPT: - Answer-
Control generator power factor
/.A true-DC wind generator might be inadvertently powered by the batteries if a
________ is not part of the installation. - Answer-Blocking diode
/.Which power sources can be seamlessly transferred? - Answer-" All of the above; AC
generators; Shore power; Inverters"
/.Which of the following needs to be considered when retrofitting an electric-propulsion
engine? - Answer-Proper ventilation of batteries
/.In a NMEA 2000 digital switching system it is necessary to use - Answer-Terminating
resistors
/.A boat's hull potential is measured: - Answer-Between a reference cell and main
engine negative
/.Which statement is correct pertaining to a NMEA 2000 system? - Answer-" Both a and
b; Resistors are to be used only at both ends of the system;
NMEA cables provide power and data in a single cable"
,/.Slower than normal engine cranking could be an indication of all the following except: -
Answer-Battery fully charged
/.Which tool could not-be used to diagnose excessive voltage drop? - Answer-Ammeter
/.An advantage of an insulated DC ground system is: - Answer-Easier detection of
ground faults
/.Which equipment may not need to be changed when a boat built by an international
builder using 50 Hz AC is imported to the US? - Answer-Water Heater
/.Which of the following could cause a shore-power ELCI main breaker to trip? -
Answer-Multiple shore-power inlet neutral conductors on the load side of the ELCI are
connected
/.The maximum battery cable gauge that can be connected to a terminal via wingnut is:
- Answer-8
/.VFDs control the speed of electric motors (pumps, fans, hoists) by regulating ____? -
Answer-frequency
/.Do VFDs typically display fault codes, and how can you determine the nature of a
fault? - Answer-Yes, they do; refer to the manufacturer's list of fault codes.
/.According to ____ , seamless transfers between sources cannot maintain parallel for
more than I second - Answer-ABYCA-32
/.True or False: four-wire sensors are the most common configuration in today's engine-
control systems. - Answer-FALSE; two- and three-wire configurations are more
common.
/.According to ABYC A-32, "synchronization" means matching all EXCEPT - Answer-
amperage
/.Compared to traditional US power sources, _____ delivers three times the power with
only 1.5 times the conductor material. - Answer-three-phase power
/.In a delta configuration, the phase voltage is _____ the line voltage - Answer-equal to
/.Three-phase power ______ than single-phase power - Answer-is more efficient
/.Proper overcurrent protection for a three-phase motor requires - Answer-a triple-pole
breaker
,/.Three-phase induction motors can be damaged by ____ in a three-phase power
distribution system. - Answer-loss of voltage
/.The most common cause of AC ripple from an alternator is: - Answer-Faulty/low-
quality rectifier diode(s)
/.Based on the Fourier method, total harmonic distortion is calculated using: - Answer-
First and third harmonics only
/.The distortion caused by multiple frequencies in output is called: - Answer-Harmonic
distortion
/.AC voltage transients cause all the following EXCEPT: - Answer-Capacitance coupling
/.When attempting to diagnose intermittent power quality issues, which feature of the
power quality analyzer is used? - Answer-Data logging
/.Which function is operational when a block load is applied? - Answer-Volts per Hz
/.Which of the following components would NOT prevent a generator from creating
voltage? - Answer-Shorted droop CT
/.The following are adjustments on voltage regulators EXCEPT - Answer-Load gain
/.Electricity coming from a solar panel must be ___ before it's delivered to a battery
bank: - Answer-regulated
/.What is the first step in specifying solar capacity on a boat? - Answer-DC load analysis
/.A semiconductor - Answer-exhibits properties directly between those of conductors
and insulators
/.Cabling from the solar-panel positive terminal to the controller should induce a voltage
drop of: - Answer-not more than 3.0%
/.Diode test function on a multi-meter (DMM) is important to ensure that: - Answer-
Series circuits don't have excessive resistance.
/.A8YC Standard A-32 addresses power-conversion systems installed between all
EXCEPT: - Answer-the public utility and the dockside shore-power outlet.
/.Synchronization may refer to compatibility of: - Answer-any of the above;
voltage;frequency ;waveform
/.E-11.8.1 Load Calculations - __ - Answer-DC
, /."Statement A: Switching between AC power sources can be done with seamless
transfer. Statement B: Switching between AC power sources can apply the break-
before-make method." - Answer-Statements A and B are both True
/.E-11.8.1.1 The following method shall be used for calculating the total electrical load
requirements for determining the minimum size of each ___________, switchboard, and
their main conductors. Additionally, this information may be used to size the alternator,
or __________, and the battery. (See E-11.6.1.1 and ABYC E-10, Storage Batteries.) -
Answer-panelboard, other charging means
/.Per ABYC Standards, before a seamless tranfer, power sources shall be: - Answer-
synchronized.
/.When converting from a gasoline engine power source to an all-electric, which of the
following does NOT need to be considered? - Answer-Horsepower of the old gasoline
engine
/.Per ABYC E-30 standards, what is the maximum impedance for ground-fault
monitoring on an AC system with regard to electric propulsion? - Answer-1,000 ohms
per volt
/.Based on ABYC E-30, if a 144 VDC electric propulsion system has a battery capacity
of 240 amp-hours, what is the required AIC rating of the overcurrent protection? -
Answer-24,000
/.The best choice for mounting a digital switching power distribution module is: -
Answer-Follow manufacturer's recommendations.
/.The maximum allowable voltage drop for a DSS power distribution module is: -
Answer-3%
/.Digital switching for AC appliances is appropriate as long as ____? - Answer-It is not
used.
/.When programming electronic circuit protection in a DSS system, it is important to use
which reset feature? - Answer-Manual reset
/.Which of the following best describes the function of a galvanic isolator? - Answer-
Blocks DC current
/.A boat's hull potential is measured: - Answer-Between a reference cell and the engine
negative terminal or its bus.
/.During a corrosion survey, the hull potential has slowly shifted by 30 mV over the
course of I hour. This indicates - Answer-Extreme under protection
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