ABYC Advanced Pretest Questions And
Answers
All of the following are functions of a generator voltage regulator EXCEPT: Control
generator power factor
A true-DC wind generator might be inadvertently powered by the batteries if a ________ is not
part of the installation. Blocking diode
Whic...
All of the following are functions of a generator voltage regulator EXCEPT: Control
generator power factor
A true-DC wind generator might be inadvertently powered by the batteries if a ________ is not
part of the installation. Blocking diode
Which power sources can be seamlessly transferred? " All of the above; AC generators;
Shore power; Inverters"
Which of the following needs to be considered when retrofitting an electric-propulsion engine?
Proper ventilation of batteries
In a NMEA 2000 digital switching system it is necessary to use Terminating resistors
A boat's hull potential is measured: Between a reference cell and main engine negative
, ABYC Advanced Pretest Questions And
Answers
Which statement is correct pertaining to a NMEA 2000 system? " 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:
Battery fully charged
Which tool could not-be used to diagnose excessive voltage drop? Ammeter
An advantage of an insulated DC ground system is: 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? Water Heater
Which of the following could cause a shore-power ELCI main breaker to trip? 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: 8
, ABYC Advanced Pretest Questions And
Answers
VFDs control the speed of electric motors (pumps, fans, hoists) by regulating ____?
frequency
Do VFDs typically display fault codes, and how can you determine the nature of a fault?
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 ABYCA-32
True or False: four-wire sensors are the most common configuration in today's engine-control
systems. FALSE; two- and three-wire configurations are more common.
According to ABYC A-32, "synchronization" means matching all EXCEPT amperage
Compared to traditional US power sources, _____ delivers three times the power with only 1.5
times the conductor material. three-phase power
, ABYC Advanced Pretest Questions And
Answers
In a delta configuration, the phase voltage is _____ the line voltage equal to
Three-phase power ______ than single-phase power is more efficient
Proper overcurrent protection for a three-phase motor requires a triple-pole breaker
Three-phase induction motors can be damaged by ____ in a three-phase power distribution
system. loss of voltage
The most common cause of AC ripple from an alternator is: Faulty/low-quality rectifier
diode(s)
Based on the Fourier method, total harmonic distortion is calculated using: First and third
harmonics only
The distortion caused by multiple frequencies in output is called: Harmonic distortion
AC voltage transients cause all the following EXCEPT: Capacitance coupling
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