Download ABYC Advanced Pretest Exam Questions and Answers and more Exams Electrical and Electronics Engineering in PDF only on Docsity!
ABYC Advanced Pretest Exam Questions with
verified Answers (SCORED A+)
A metallic shore power inlet becomes hot to the touch. Which would not be a contributing factor? :correct answer: Temperature rating of shore-cord insulation An inter-circuit short can cause: :correct 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? :correct answer: Power conditioning and conversion LED navigation lights are required to meet: :correct answer: 72 Colregs Which of the following are recommended for 3-phase shore power? :correct answer: Power conditioning and phase-rotation monitoring Which of the following is an example of a power-quality issue? :correct answer: Nuisance tripping of magnetic circuit breakers What tool can be used instead of a power-quality analyzer to measure phase amplitude? :correct answer: DVOM All of the following are functions of a generator voltage regulator EXCEPT: :correct 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. :correct answer: Blocking diode Which power sources can be seamlessly transferred? :correct answer: " All of the above; AC generators; Shore power; Inverters"
Which of the following needs to be considered when retrofitting an electric- propulsion engine? :correct answer: Proper ventilation of batteries In a NMEA 2000 digital switching system it is necessary to use :correct answer: Terminating resistors A boat's hull potential is measured: :correct answer: Between a reference cell and main engine negative Which statement is correct pertaining to a NMEA 2000 system? :correct 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: :correct answer: Battery fully charged Which tool could not-be used to diagnose excessive voltage drop? :correct answer: Ammeter An advantage of an insulated DC ground system is: :correct 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? :correct answer: Water Heater Which of the following could cause a shore-power ELCI main breaker to trip? :correct 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: :correct answer: 8 VFDs control the speed of electric motors (pumps, fans, hoists) by regulating ____? :correct answer: frequency Do VFDs typically display fault codes, and how can you determine the nature of a fault? :correct answer: Yes, they do; refer to the manufacturer's list of fault codes.
Which function is operational when a block load is applied? :correct answer: Volts per Hz Which of the following components would NOT prevent a generator from creating voltage? :correct answer: Shorted droop CT The following are adjustments on voltage regulators EXCEPT :correct answer: Load gain Electricity coming from a solar panel must be ___ before it's delivered to a battery bank: :correct answer: regulated What is the first step in specifying solar capacity on a boat? :correct answer: DC load analysis A semiconductor :correct 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: :correct answer: not more than 3.0% Diode test function on a multi-meter (DMM) is important to ensure that: :correct answer: Series circuits don't have excessive resistance. A8YC Standard A-32 addresses power-conversion systems installed between all EXCEPT: :correct answer: the public utility and the dockside shore-power outlet. Synchronization may refer to compatibility of: :correct answer: any of the above; voltage;frequency ;waveform E-11.8.1 Load Calculations - __ :correct 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." :correct 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.) :correct answer: panelboard, other charging means Per ABYC Standards, before a seamless tranfer, power sources shall be: :correct answer: synchronized. When converting from a gasoline engine power source to an all-electric, which of the following does NOT need to be considered? :correct 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? :correct 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? :correct answer: 24, The best choice for mounting a digital switching power distribution module is: :correct answer: Follow manufacturer's recommendations. The maximum allowable voltage drop for a DSS power distribution module is: :correct answer: 3% Digital switching for AC appliances is appropriate as long as ____? :correct answer: It is not used. When programming electronic circuit protection in a DSS system, it is important to use which reset feature? :correct answer: Manual reset Which of the following best describes the function of a galvanic isolator? :correct answer: Blocks DC current A boat's hull potential is measured: :correct 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 :correct answer: Extreme under protection You have detected a harmful 250mA DC galvanic current flow from the boat's ground to the dock ground through the shore-power grounding conductor.
A-32.2 SCOPE This document applies to electrical and electronic power conversion and control equipment in the AC shore power feed: A-32.2.2 to on __________operating at ___ VAC or less; single or three-phase, installed between the shore power inlet and the distribution panel, between shore power and on-board AC power sources, and between multiple on-board AC power sources for the purposes of: Power conditioning and conversion ◊ Seamless transfer between sources ◊ Parallel operation of sources :correct answer: board distribution systems, 300 A-32.4.1 ________________- an electrical, electronic or electromechanical device which typically provides the following capabilities - electrical isolation, frequency conversion and voltage conversion - between the shore outlet and the boats electrical system. Additional capabilities may be included as required by specific installations (e.g. phase conversion, power conditioning, synchronization). :correct answer: AC Shore Power Converter A-32.4.2 ___________ - an electrical, electronic or electromechanical device which typically provides manual or automatic voltage regulation. Additional capabilities may be included as required by specific installations. (e.g. electrical isolation, noise suppression) :correct answer: AC Shore Power Voltage Regulator A-32.4.3 ______ - condition in which voltage or energy available from an AC power source is inadvertently supplied to devices or connections not intended to be energized by the source supplying the power ( e.g. onboard generator set supplying power to the shore power inlet) under normal and single fault conditions. :correct answer: Backfeed A-32.4.4 ___________ - an electrical or electronic control means of preventing unintended simultaneous operation of power switching devices. :correct answer: Electrical Interlocking A-32.4.5 Independent Laboratory- a facility that: A-32.4.5.1 is engaged, as a _________, in performing periodic inspections and tests that are the same as,
or similar to, the inspections and qualification tests required for the equipment or material being evaluated, :correct answer: regular part of its business A-32.4.5 Independent Laboratory- a facility that: A-32.4.5.2 has, or has_______ to, the apparatus, facilities, personnel, and calibrated instruments that are necessary to inspect and test the equipment or material being evaluated, and :correct answer: access A-32.4.5 Independent Laboratory- a facility that:A-32.4.5.3 is not owned or controlled by: A-2.4.5.3.1 the_________ of the equipment or material to be inspected or tested or any similar equipment or material; or :correct answer: manufacturer A-32.4.5 Independent Laboratory- a facility that:A-32.4.5.3 is not owned or controlled by: A-32.4.5.3.2 a____ of the equipment or material to be inspected or tested or a vendor of similar equipment or materials; or :correct answer: vendor A-32.4.5 Independent Laboratory- a facility that:A-32.4.5.3 is not owned or controlled by: A-32.4.5.3.3 a______ of materials to the manufacturer. :correct answer: supplier A-32.4.6 __________- automatic and proportional sharing of the real (kW) and reactive (kVAR) power of paralleled AC power sources. :correct answer: Load Sharing A-32.4.7 __________ - a point of connection for all power source output ground and neutral conductors. This may be a single combined bus for both the source neutral and ground conductors or separate neutral and ground busses joined by a common conductor. :correct answer: Main AC grounding bus A-32.4.8 __________ - a connection of multiple synchronized AC power sources. :correct answer: Parallel Operation A-32.4.9 __________ - a momentary connection of separate synchronized AC power sources to avoid interruption before the transfer of power from one source to another. :correct answer: Seamless Transfer
A-32.6.1 AC shore power converters shall meet the requirements of ___________ Equipment - Semiconductor converters. :correct answer: IEC 60092 - 304 A-32.6.2 AC shore power converters incorporating ____________ shall meet the requirements of an isolation transformer in ABYC E-11, AC & DC Electrical Systems on Boats, if used for the purposes of galvanic isolation. :correct answer: isolation transformers A-32.7 _____________________ :correct answer: AC SHORE POWER VOLTAGE REGULATORS A32.7.1 Automatic voltage regulators shall maintain ±% of rated voltage. :correct answer: 10 A32.7.2 Manual voltage regulators shall indicate an under/over voltage condition outside ±% of rated voltage. :correct answer: 10 A32.7.3 If the _____uses a transformer for the purposes of galvanic isolation, it shall meet the requirements of an isolation transformer in ABYC E-11, AC & DC Electrical Systems on Boats. :correct answer: voltage regulator A-32.8 ___________ :correct answer: ELECTRICAL INTERLOCKING 32.8.1 Electrical interlocking shall be provided for ________in installations that are not capable of seamless transfer or parallel operations and to prevent a single bus from being energized by more than one non-synchronized AC power source simultaneously. :correct answer: switching devices A-32.9 __________ :correct answer: BACKFEED PROTECTION A-32.9.1 Provisions shall be made to prevent __________ of any source that is not intended to be energized or is inadvertently disconnected. NOTE: Typically, backfeed protection is used to prevent onboard generators or inverters from applying voltage to the shore cord and onshore electrical supply system, for example to prevent shock-hazardous AC voltage from being present at the shore inlet when it is disconnected from shore. :correct answer: back feeding
A-32.9.2 Backfeed protection shall operate within ___ms of the disconnection of the input AC power source. NOTE: This can be tested using IEC 62116 Test procedure of islanding prevention measures for utility-interconnected photovoltaic inverters; or IEEE 1547 Standard for Interconnecting Distributed Resources With the Electric Power System. :correct answer: 100 A-32.10 _____________ :correct answer: MULTIPLE SHORE POWER SOURCE PARALLELING AND COMBINING DEVICES A-32.10.1 Devices capable of________ multiple independent shore power sources shall: :correct answer: combining A-32.10.1 Devices capable of combining multiple independent shore power sources shall: A-32.10.1.1 Establish and maintain_______ while combining the sources. :correct answer: synchronization A-32.10.1 Devices capable of combining multiple independent shore power sources shall: A-32.10.1.2 Prevent_______ of any source that is not intended to be energized or is disconnected. :correct answer: backfeeding A-32.11 ____________ :correct answer: SEAMLESS TRANSFER A-32.11.1 AC power sources shall be ______ before seamless transfer. :correct answer: synchronized A-32.11.2 During seamless transfers between shore power and an onboard source, sources shall be paralleled for no more than I second to facilitate load transfer. EXCEPTION: Installations employing ___________ with provisions for seamless transfer and backfeed protection (See A-32.8 for backfeed protection requirements) :correct answer: AC shore power converters and/or inverters A-32.11.3 During seamless transfers between onboard AC sources, reverse power protection shall be provided in accordance with the equipment___________ instructions. (See DIAGRAM 4 (FIGURE 7-4) and DIAGRAMS (FIGURE 7-5).) :correct answer: manufacturer's A-32.12 _______________ :correct answer: PARALLEL OPERATION OF POWER SOURCES
A-32.12.5 _________ :correct answer: Generators A-32.12.5.1 Provisions shall be made to load share paralleled_______ during steady state operation. :correct answer: generators A-32.12.5.2 Reverse power protection shall be provided in accordance with the equipment_________ instructions. :correct answer: manufacturer's A-32.12.5.3 During seamless transfers between on board AC sources, reverse power protection shall be provided; for generators, reverse power shall not exceed __% of rated output. :correct answer: 15 A-32.12.6 _________ :correct answer: Inverters A-32.12.6.1 Inverters operating in parallel with shore power and/or generators shall not have the output ______________ at the inverter. :correct answer: neutral grounded A-32.12.6.2 During seamless transfers between on board AC sources, ___________ shall be provided for inverters. Converters with an inverter output reverse power shall not be possible. NOTE: See ABYC A-31, Battery Chargers and Inverters, for stand-alone inverter installations. :correct answer: reverse power protection A-32.12.6.3 When the output of two or more inverters are connected in parallel to one another and to no other AC power source, the output neutrals shall be grounded at each inverter or at the main ___________. :correct answer: AC grounding/neutral bus A-32.12.7 __________ :correct answer: Shore Power Converters A-32.12.7.1 Provisions shall be made to prevent______ of any source that is not intended to be energized or is inadvertently disconnected. :correct answer: backfeeding A-32.12.7.2 Provisions shall be made to ___________the output of paralleled shore power converters. :correct answer: load share E-30 _____________ :correct answer: ELECTRIC PROPULSION SYSTEMS
E-30.1 PURPOSE This standard is a guide for the design, construction, and installation of alternating current (AC) and direct current (DC) electrical systems on boats for the purpose of propulsion. NOTES: 1. _____________ has promulgated mandatory requirements for electrical systems in Title 33, CFR 183 Subpart I. Refer to the CFR for current federal requirements. :correct answer: The United States Coast Guard E-30.1 PURPOSE This standard is a guide for the design, construction, and installation of alternating current (AC) and direct current (DC) electrical systems on boats for the purpose of propulsion. NOTES: 2. ABYC E-11, AC and DC Electrical Systems on Boats outlines information for voltages less than ___VAC and __VDC. :correct answer: 300, 60 E-30.1 PURPOSE This standard is a guide for the design, construction, and installation of alternating current (AC) and direct current (DC) electrical systems on boats for the purpose of propulsion. NOTES: 3. Three phase power systems pose different and significant risks from those encountered with single phase systems and should only be installed and maintained by properly trained technicians under appropriate engineering supervision, and in accordance with specifications detailed in any of the various recognized standards including____, ABS, Det Norske Veritas, etc. :correct answer: IEEE E-30.1 PURPOSE This standard is a guide for the design, construction, and installation of alternating current (AC) and direct current (DC) electrical systems on boats for the purpose of propulsion. NOTES: 3. Three phase power systems pose different and significant risks from those encountered with single phase systems and should only be installed and maintained by properly trained technicians under appropriate engineering supervision, and in accordance with specifications detailed in any of the various recognized standards including IEEE,____, Det Norske Veritas, etc. :correct answer: ABS E-30.1 PURPOSE This standard is a guide for the design, construction, and installation of alternating current (AC) and direct current (DC) electrical systems
current carrying parts of AC electrical equipment to the AC grounding bus, engine negative terminal or its bus, and to the source ground. :correct answer: Grounding E-30.4.3 ___________ - a mechanical assembly comprised of battery cells and restraining frames or trays and possibly components for battery management. :correct answer: Battery Pack E-30.4.4 __________- a mechanical switching device capable of making, carrying, and breaking currents under normal load conditions, and also making, carrying for a specified time, and breaking currents under specified abnormal conditions such as those of a short circuit. :correct answer: Circuit Breaker E-30.4.5 ____________- an area where moisture is intermittently present ( e.g., bilge, head, galley). :correct answer: Damp Area E-30.4.6 ___________ - a mechanical switching device which, in the open position, complies with requirements specified for the isolating function. :correct answer: Disconnect Device E-30.4.7 ___________ - the electrical resistance between a voltage source and any conductive structure. A value greater than or equal to 500 ohms per volt for DC systems and 1000 ohms per volt for AC systems is defined as "isolated:' Isolation is measured from all current carrying conductors of power relative to any conductive structure. :correct answer: Electrical Isolation E-30.4.8______ - a device which by melting opens the circuit in which it is inserted, breaking the current flow when it exceeds a given value for sufficient time. :correct answer: Fuse E-30.4.9 __________ - enclosed space that is surrounded by permanent boat structure and is intended to remain dry under normal use. :correct answer: Interior Space E-30.4.10 ___________ - a space that contains engine(s) and/or motors(s) for mechanical or electrical power or propulsion. :correct answer: Machinery Space
E-30.4.11 __________ - an assembly of devices, such as circuit breakers, fuses, switches, instruments, and indicators, for the purpose of controlling and/or distributing electrical power. :correct answer: Panelboard (switchboard) E-30.4.12 _____________ - voltage levels that can harm humans through electric shock (see UL 2231, Personnel Protection Systems for Electric Vehicle (EV) Supply Circuits: General Requirements and UL 2202, Electric Vehicle (EV) Charging System Equipment). DC voltages over 60 V and all AC voltages are considered potentially hazardous. :correct answer: Potentially Hazardous Voltage E-30.4.13 __________- a device whose maximum output is restricted to a specified value by its magnetic or electrical characteristics. :correct answer: Self-limiting E-30.4.14 __________ - All exterior areas exposed to weather and not fully enclosed by permanent boat structures. :correct answer: Wet Area E-30.5.1 The electrical wiring, connections, and installation shall be in accordance with the requirements of ________, AC and DC Electrical Systems on Boats except when otherwise noted. :correct answer: ABYC E- 11 E-30.5.2 Optional equipment at or below 60 VDC or 300 VAC, dependent and connected to this system such as low voltage AC and/or DC appliances (e.g. ,galley stoves, HVAC, water heaters,), shall be powered by isolated sources, such as __________ DC to DC converters, galvanically isolated DC to AC inverters, or AC safety/isolation transformers. :correct answer: galvanically isolated E-30.5.3 The ________________________ shall be considered when choosing cable size, 30°C (86 °F), 50°C (122°F) and 60°C (140°F) degree ambients are represented in TABLE I. The ambient environment design temperature of machinery spaces shall be considered to be 122°F (50°C). :correct answer: ambient environment design temperature
This includes fluctuating voltage and load conditions which will occur during normal operation of the vessel. :correct answer: functionally tolerant E-30.5.9 Electrical transients resulting from normal operation of the vessel shall not cause ___________ of the vessel or its operating systems (see ABYC P-27, Electric/Electronic Steering Systems and ABYC P-24, Electric/Electronic Propulsion Control Systems for commonly used EMI/EMC testing criteria). :correct answer: false shutdowns E-30.5.10 All electrical equipment located in the same compartment or space as a battery or battery pack that has the possibility of admitting flammable gas or substances shall be _____________ according to ABYC E-11 AC and DC Electrical Systems on Boats. :correct answer: ignition-protected E-30.5.11 All conductors for 60VDC and over shall indicate the correct polarity and be orange in color or otherwise______ as exceeding 60 VDC.AII conductors for systems operating at a voltage greater than 300VAC shall be _______ as such. :correct answer: identified E-30.5.12 Battery bank installations shall be provided with: E-30.5.12.1 a _______ that is capable of disconnecting the battery source when under rated load and :correct answer: switch E-30.5.12 Battery bank installations shall be provided with: E-30.5.12.2 a disconnector with a means of being_______ in the open position for maintenance operations. :correct answer: locked E-30.5.13 Areas and equipment that are not designed for passenger contact (e.g., battery compartments and electrical assemblies) shall be: E-30.5.13.1 accessible only with use of ______ and :correct answer: tools E-30.5.13 Areas and equipment that are not designed for passenger contact (e.g., battery compartments and electrical assemblies) shall be: E-30.5.13.2________ appropriate to the hazard present. :correct answer: labeled E-30.5.14 On systems of 60 VDC and over as well as on all AC systems, the system________ shall provide documentation and installation requirements for
proper procedures to isolate and lock power sources to prevent unintended or accidental contact with energized components. :correct answer: manufacturer E-30.7 ___________ :correct answer: MONITORING E-30.7.1 _________- a monitoring system shall be installed to provide warning of the impedance of less than 500 ohms per volt for DC systems and 1000 ohms per volt for AC systems, between the source of voltage and any conductive surface. :correct answer: Ground Fault Monitor E-30.7.2 The vessel operator shall be _____ to the existence of a system fault or failure that could lead to further damage to the electrical system, if allowed to persist uncorrected. :correct answer: alerted E-30.7.3 Warning by means of a warning light or alarm visible and/or audible from each helm station and any system monitoring location shall be given in the event of a failure. NOTES: Examples of these conditions include, but are not limited to: 1. _____________ :correct answer: Loss of battery system isolation, E-30.7.3 Warning by means of a warning light or alarm visible and/or audible from each helm station and any system monitoring location shall be given in the event of a failure. NOTES: Examples of these conditions include, but are not limited to: 2. _________ :correct answer: Low state of charge E-30.7.3 Warning by means of a warning light or alarm visible and/or audible from each helm station and any system monitoring location shall be given in the event of a failure. NOTES: Examples of these conditions include, but are not limited to: 3. ___________ :correct answer: Over temperature E-30.7.3 Warning by means of a warning light or alarm visible and/or audible from each helm station and any system monitoring location shall be given in the event of a failure. NOTES: Examples of these conditions include, but are not limited to: 4. ________ :correct answer: Potentially hazardous voltage E-30.7.3 Warning by means of a warning light or alarm visible and/or audible from each helm station and any system monitoring location shall be given in the
