ASA 104 exam questions with ANSWERS

ASA 104 exam questions with ANSWERS
|\ |\ |\ |\ |\




Engine Start Up Procedure - CORRECT ANSWERS ✔✔1.
|\ |\ |\ |\ |\ |\ |\ |\



Locate battery selector switch and turn to the starter
|\ |\ |\ |\ |\ |\ |\ |\ |\



battery
2. Verify that the gear shift is in neutral.
|\ |\ |\ |\ |\ |\ |\ |\




3. Locate the shut off lever and be sure that it is pushed
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



in.
4. Turn key and push the start button.
|\ |\ |\ |\ |\ |\ |\




5. Allow the engine to idle and check that coolant water is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



being discharged astern.
|\ |\ |\




6. Reduce throttle to idle position.
|\ |\ |\ |\ |\




Raw water Coolant System Components - CORRECT
|\ |\ |\ |\ |\ |\ |\



ANSWERS ✔✔Through-hull value |\ |\




Water strainer |\




Water pump / impellor
|\ |\ |\




Heat exchanger |\




Exhaust mixer |\




Exhaust through-hull (above the water line)
|\ |\ |\ |\ |\




Closed water Coolant System Components - CORRECT
|\ |\ |\ |\ |\ |\ |\



ANSWERS ✔✔This system circulates throughout the
|\ |\ |\ |\ |\ |\

,engine and in most modern sailing vessels also through
|\ |\ |\ |\ |\ |\ |\ |\ |\



the onboard fresh hot water tank.
|\ |\ |\ |\ |\ |\




As the closed water system circulates through the heat
|\ |\ |\ |\ |\ |\ |\ |\ |\



exchanger, the raw water system draws off the heat from |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



the engine block much like a car's radiator and fan do.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\




The two most important parts of this system are the fresh
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



water pump and the heat exchanger.
|\ |\ |\ |\ |\ |\ |\




The skipper cannot easily service the fresh water coolant
|\ |\ |\ |\ |\ |\ |\ |\ |\



pump; this unit will need to be removed from the engine
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



and parts replaced by a professional or DIY.
|\ |\ |\ |\ |\ |\ |\ |\




Inside the systems is also a thermostat like the one in a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



car. You can remove this and run the engine safely
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



without it, if it is not opening. |\ |\ |\ |\ |\ |\ |\




However, the usual problem with the closed water coolant |\ |\ |\ |\ |\ |\ |\ |\



system is a broken hose or connection.
|\ |\ |\ |\ |\ |\ |\ |\




One needs to check the level of the fresh water system.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



This should be a 50/50 mixer of fresh water and anti-
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



freeze. |\




This system becomes pressurized as the engine heats up,
|\ |\ |\ |\ |\ |\ |\ |\



so one should not remove the radiator cap when the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



engine block is hot. |\ |\ |\




1. Fuel system - Components - CORRECT ANSWERS ✔✔1.
|\ |\ |\ |\ |\ |\ |\ |\ |\



Deck fill |\




2. Fuel tank with vent hose to the outside
|\ |\ |\ |\ |\ |\ |\ |\




3. Fuel pick-up line inside the fuel tank
|\ |\ |\ |\ |\ |\ |\

,4. Fuel shut off valve
|\ |\ |\ |\




5. Water separator - not all systems have this This will
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



remove any water from the diesel fuel. |\ |\ |\ |\ |\ |\




6. Primary fuel filter - removes larger impurities from the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



fuel and will need to be serviced on a regular schedule In
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



most modern vessel, these two units are combined into
|\ |\ |\ |\ |\ |\ |\ |\ |\



one unit like on board At Last.
|\ |\ |\ |\ |\ |\




7. Lift pump - also has a primer lever to prime the fuel
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



lines
8. Secondary fuel filter - removes smaller impurities from
|\ |\ |\ |\ |\ |\ |\ |\ |\



the fuel before it is sent to the injector pump
|\ |\ |\ |\ |\ |\ |\ |\ |\




9. Injector pump - high pressure, the fuel lines into and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



out of this pump change from rubber to metal
|\ |\ |\ |\ |\ |\ |\ |\




Injectors
10. Unused fuel return lines
|\ |\ |\ |\




Fuel Planning - CORRECT ANSWERS ✔✔One needs to first
|\ |\ |\ |\ |\ |\ |\ |\ |\



know the tank capacity. |\ |\ |\ |\




Our first calculation will be to determine how much fuel
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



the vessel consumes in one hour at cruising RPM.
|\ |\ |\ |\ |\ |\ |\ |\ |\




Next, we must determine the consumption of fuel per
|\ |\ |\ |\ |\ |\ |\ |\ |\



nautical mile per mile NMPG. |\ |\ |\ |\ |\




Using this number, we can now calculate our range under
|\ |\ |\ |\ |\ |\ |\ |\ |\



power.
|\ |\

, Naturally, one will need to have a reserve for |\ |\ |\ |\ |\ |\ |\ |\ |\



emergencies. |\




The textbook recommends 1/3 reserve.
|\ |\ |\ |\ |\




Often larger impurities will accumulate near the bottom of
|\ |\ |\ |\ |\ |\ |\ |\



the tank and these can cause major problems, especially
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



with lots of wave action.
|\ |\ |\ |\




There are a number of issues which can decrease our
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



range. These include |\ |\ |\




- wind and waves, as well as the
|\ |\ |\ |\ |\ |\ |\ |\




- condition of the vessel's haul and the weight of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



vessel, crew, and gear. |\ |\ |\ |\




Of course, the wind and waves could also increase our
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



range!


At Last has a 40 gallon fuel tank.
|\ |\ |\ |\ |\ |\ |\ |\




- Using my recommendation, that will give us 26 usable
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



gallons. |\




- At 2500 rpm, she uses 0.75 gallons per hour at a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



cruising speed of 6.5 kt per hour. |\ |\ |\ |\ |\ |\ |\




- At Last would travel approximate 8.6 nm per 1 gallon of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



fuel. - - Therefore, her cruising range under power would
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



be 223 nm. |\ |\ |\