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ABYC Marine systems
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ABYC Marine systems
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ABYC Marine systems 2022-2023. A 120 VAC electric water heater is rate at 1500 Watts. The minimum fuse size for the circuit
supplying the heater wold be:
a. 5 Amps
b. 10 Amps
c. 15 Amps
d. 20 Amps - ANS-C. 15 Amps
. A Type 1sanitation system is designed to permit:
a. direct untreated overboard discharge of waste
b. use of a holding tank only
c. treat then discharge overboard
d. treated and then held in the holding tank - ANS-C. Treat then discharge overboard
. According to ABYC A-24, a CO monitor should be installed so that it:
a. can be turned off and on with the main electrical panel supply breaker
b. can be equipped with an on/off switch
c. can never be turned off
d. is supplied by a circuit that uses a fuse or lock-out equipped circuit breaker - ANS-D. is
supplied by a circuit that uses a fuse or lockout equipped circuit breaker
. According to ABYC, all of the following considerations need to be given to evaporator
condensate drains, EXCEPT: A.contain a P-trap to prevent ingress of CO B.the diameter of the
drain C.drains overboard or into a bilge area other than shared by an engine D.orient the
containment pan to facilitate complete drainage - ANS-B. the diameter of the drain
. Diaphragm pumps are self-priming, T or F? - ANS-True
. Exposed metallic parts of a potable water system shall have provisions for electrical bonding. T
or F? - ANS-True
. For A/C ducts, how high (typically) should cool air output "supply" ducts be mounted in the
cabin? - ANS-Waist height or higher
. For A/C return air ducts, should the cabin intake be mounted high or low? - ANS-Low, near the
floor
. How many hose clamps should be used on all fuel fill lines? - ANS-Two
,. How many portable (USCG Type B-1) fire extinguishers must be present on a boat which is
between 26' and 40' in length? - ANS-3 (outside engine compartment, steering position, and
galley or passenger cockpit)
. How quickly must electric steering systems be operational after powering up? - ANS-1 second
or less
. If additional OC protection is required (within 10' of shore power inlet) and a fuse is used, what
are the limits on the rage of allowable AIC for this fuse? - ANS-It must not blow before the main
shore power circuit breaker nor be rated greater than 125% of the main shore power circuit
breaker.
. In a portable fuel tank, what percentage air expansion is required? - ANS-5%
. In fuel systems where fuel may siphon, what is required? - ANS-A shut off valve located where
it will stop siphoning action
. LPG lockers must be vented at the bottom of the locker by a dedicated vent with what
minimum diameter? - ANS-1/2 inch ID
. Name 5 materials allowable for contact use in potable water systems: - ANS-1. Copper Alloys
(incl. bronze, brass and nickelcopper) 2. AISI Type 300 series stainless steel
3. Glass-lined metal
4. FDA approved plastic 5. FDA approved rubber
. Name four mechanical (non-electrical) factors that affect pump efficiency - ANS-• intake or
discharge lift (head)
• discharge hose length
• hose bends (qty and radius)
• hose interior roughness (corrugation)
• cross-sectional reductions (check valves, thru-hulls, etc.)
. Name three types of pumps typically used in marine sanitation systems. - ANS-Flexible
Impeller, Diaphragm, Simple Piston
. Storage tank inlets may also serve as the tank vent. T or F? - ANS-False
. T or F: according to ABYC, Bilge Blower motors can tolerate 10% voltage drop when sizing DC
cables. - ANS-False - use 3% drop
. T or F: All macerator pumps are self-priming - ANS-Fals
, . T or F: Diesel machinery (engines, generators, and blowers) installed in protected spaces on
gasoline boats shall be automatically shut down upon discharge of a fixed fire extinguishing
system. - ANS-True
. T or F: Each LPG system must be fitted with a pressure gauge? - ANS-True
. T or F: Helm displacement refers to the amount of hydraulic fluid output per helm revolution. -
ANS-True
. T or F: Impeller pumps may be damaged by running dry - ANS-True
. T or F: LPG is lighter than air and will rise when released. - ANS-False. LPG is heavier than air
and will fall when released.
. T or F: metallic deck fills must be grounded - ANS-True
. T or F: Only systems using LPG cylinders of the "vapor withdraw" type are permitted. Cylinders
designed or installed to as to admit liquified gas into any other part of the system are prohibited.
- ANS-True.
. T or F: valves & petcocks for drawing gasoline from a fuel tank are not allowed. - ANS-True
. Tech A says that crushed or restricted ducting may cause icing in the evaporator. Tech B says
that dirty air filters at the evaporator may cause icing. Which is correct? A, B, Both, or Neither? -
ANS-Both are correct
. True of False: metallic fuel tanks shall be galvanized on the inside and outside for gasoline, but
only on the outside for diesel. - ANS-True
. Use of an incorrect type of sanitation hose could cause all of the following except:
a. Fire
b. Bad odor due to permeation
c. System blockage
d. Flooding on board - ANS-A. Fire
. What are the trip level and trip time maximums for ELCIs & RCDs? - ANS-30 mA, 100 ms
maximum
. What are two special features required for an AC power transfer switch (i.e., switches between
multiple AC sources to a branch circuit, device or receptacle) - ANS-Break-before-make +
Overcurrent Protected
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