ABYC Advanced Pretest Exam Questions & Answers (SCORED A)
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Course
ABYC Advanced Pretest
Institution
ABYC Advanced Pretest
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 ...
ABYC Advanced Pretest Exam
Questions & Answers (SCORED A)
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
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