1) Only gasoline exhaust systems shall be gas-tight to the hull interior

Transcription

1 1) Only gasoline exhaust systems shall be gas-tight to the hull interior 2) The primary purpose of an exhaust riser is to: a) direct laminar flow of exhaust gases overboard b) prevent water from flowing back to the engine c) mix jacket cooling water, exhaust gases and raw water d) silence and noise attenuation 3) Only fittings near the exhaust system terminus(i) must be accessible for inspection and repair 4) The exhaust system shall be designed and installed to prevent cooling, raw or rain water from entering the engine through the exhaust: a) Under all normal operating conditions b) Under extreme operating conditions c) While the engine is at idle 5) Propulsion engines and generator engine exhaust systems may share the same exhaust system and terminus where the generator exhaust dumps into the propulsion engine exhaust system 24 inches forward of the terminus. 6) The minimum pipe schedule for threaded pipe and fittings that is allowed to be used in engine exhaust(s) is schedule. a) 40 b) 60 c) 80 d) 120

2 7) Protective guards, jacketing, or covers shall be provided wherever persons or gear might come in contact with the exhaust system where the temperature exceeds. a) 100 degf, (37.7 degc) b) 300 deg F, (148.8 degc) c) 200 degf, (93 degc) d) 150 degf, (65.5 degc) 8) An indicator need only be installed at one helm position to indicate loss of exhaust system cooling water supply. 9) Every exhaust hose connection shall be secured with at least nonoverlapping clamps at each end to produce a secure, liquid and vapor-tight joint. a) three b) one c) two d) four 10) Stainless steel metal clamp bands for a flexible exhaust hose connection shall be a minimum of in width. a) ¾, (16mm) b) 1, (24mm) c) ½, (12mm) d) ¼, (6mm) 11) Reinforced thermoset plastic (fiberglass) waterlift mufflers and water/gas separators that retain water after engine shut-down shall withstand a minimum burst pressure test. With the muffler sealed, when the maximum pressure of 100psig is reached, the muffler shall maintain 100psig for. a) 4 minutes b) 3 minutes c) 30 seconds d) 15 minutes

3 12) In a dry exhaust system, metallic connections shall be flanged, threaded, or. a) clamped b) welded c) secured d) joined with flex hose 13) Protective guards, jacketing, or covers shall be provided wherever persons or gear might come into contact with the exhaust system where temperature exceeds exceeding. a) 300 degf, (149 degc) b) 150 degf, (65.5 degc) c) 220 degf, (104 degc) d) 200 degf, (93 degc) 14) Diesel engine flexible dry exhaust sections, where used, shall be. a) carbon steel, nickel iron chrome, stainless steel b) copper nickel, nickel iron steel, stainless steel c) nickel copper, copper nickel, nickel iron chrome, stainless steel d) carbon steel, copper nickel 15) An aluminum exhaust pipe used in a wet exhaust system for a gasoline engine shall be a minimum of schedule, with a corrosion resistance of 6061 or better, and may only be used in the self-draining section of the exhaust system. a) 40 b) 60 c) 80 d) ) Materials used in a marine engine exhaust system shall be resistant to saltwater corrosion and exhaust products, and shall be. a) dissimilar metals b) galvanically compatible c) galvanically isolated d) bonded to the negative bus

4 17) A generator exhaust terminus is permitted to be located in easily occupied cavity in order to trap exhaust 18) In order to minimize the potential for migration of carbon monoxide from machinery compartments containing gasoline engines to adjacent accommodation compartments, bulkhead and deck penetrations shall be a) sealed b) sealed in accordance with the requirements of ABYC H-2, Ventilation of Boats Using Gasoline. c) sealed in accordance with the requirements of ABYC A-24, Carbon Monoxide Detection Systems. d) sealed in accordance with the requirements of ABYC H-32, Ventilation of Boats Using Diesel Fuel. 19) Vertical dry exhaust systems shall be designed and installed to. a) arrest sparks b) reduce smoke c) reduce carbon monoxide d) reduce station wagon effect 20) For auxiliary power in sailboats, it is best to locate the siphon break on the boat's. a) centerline b) waterline c) exhaust terminus d) muffler section 21) Some siphon break devices require periodic maintenance to maintain their intended effectiveness. Some problems encountered are that prevent the device from operating. a) the formation of hydro carbons or the products of corrosion b) the formation of salts or the products of corrosion c) the formation of salts or the by-products of combustion d) the formation of verdigris or the products of crevice corrosion

5 22) In a waterlift system that is designed to prevent siphoning through the raw water pump when the engine is stopped can be accomplished through the use of a siphon break. The siphon break shall be installed at the top of a loop that shall rise high enough to assure that the high point where the siphon break device is installed will always be above the water level surrounding the boat. This loop may be 12 to 18 in. (30 to 45 cm) above the waterline at repose and. a) the loop shall be between the water pump suction and the point of injection of cooling water into the exhaust system b) the loop shall be between the water pump outlet and the exhaust system terminus c) the loop shall be between the water pump outlet and the point of injection of cooling water into the exhaust system d) the loop shall be between the exhaust manifold outlet and the point of injection of cooling water into the exhaust system 23) Clamps depending solely on spring tension shall not be used. 24) A wet exhaust system shall have a continuous source of cooling water. The cooling water shall be engine cooling water, raw water from a heat exchanger, raw water, or. a) a combination of any of the above. b) a combination engine cooling water and jacket water. c) a combination of exhaust gases and raw water. d) a combination of jacket water and raw water. 25) Exhaust system piping and components shall be supported to minimize the risk of. a) failure from corrosion, shock, contraction, and contraction. b) failure from vibration, shock, expansion, and contraction. c) failure from vibration, crevice corrosion, galvanic corrosion, and contraction. d) failure from vibration, shock, flexing, and cracking.