Propulsion Flashcards
A ______ traveling in one direction constitutes a stroke.
Piston
The major difference between a two stroke and four stroke engine is the method through which they take in the _____ _____ mixture and exhaust the spent gases.
fuel/air
In a two stroke engine, _______ gases exit the cylinder through a hole in the cylinder wall.
exhaust
In a two stroke engine, the ________ stroke of the piston pressurizes the air in the crankcase.
downward
A _______ driven diaphragm fuel pump is typically found on a 4 stroke outboard engine.
mechanical
The increase in speed of the air flow through the narrow section of a ________ throat is known as the venturi effect.
carburetor
The purpose of the throttle body is to _______ air flow.
regulate
An Oil Injection outboard engine system uses a pump to draw oil from a ________.
reservoir
The Temperature Sensor provides the engine’s computer with temperature information for ______ and ignition optimization.
fuel
The Gear Case transmits ______ power to the propeller.
engine
In a jet drive system, the impeller is capable of pumping ______ _________ of water at relatively low pressures.
large volumes
The Starter Solenoid is a _______ operated, semi-automatic switch used to relay power from the battery to the starter motor.
remotely
A Magneto is generally used on smaller outboard engines to _______ electricity.
produce
The Voltage Regulator _______ of an outboard engine has the ability to turn on and off as needed to regulate the charging/electrical system.
Rectifier
Most Coast Guard installed outboard engines use an ignition system known as a __________ Discharge (CD) ignition whereby the system’s electricity is stored in a capacitor
Capacitor
Most outboard motor manufacturers recommend a gear case oil _______ _______ every 50 operational hours and oil replacement every 100 operational hours.
level check
Most outboard engine manufacturers recommend _______ _______ replacement once the engine reaches its first 100 hours.
spark plug
Most outboard manufacturers recommend that you replace the engine’s _______ pump at least semi-annually.
water
Fuel Injection occurs at or near the end of the ________ stroke and just before the power stroke.
compression
In a four stoke diesel engine, ________ ________ is used to describe the timeframe during which both the intake and exhaust valves are open.
Valve Overlap
In a two stroke diesel engine how many revolutions does the camshaft spin in relation to the crankshaft?
1:1
In the two-stroke diesel engine combustion process, the power stroke starts after the ______ passes near TDC.
piston
Diesel engines higher compression ratios are used to heat the air in the _______ to approximately 1000 degrees Fahrenheit (oF), this is this called Heat of Compression.
cylinder
The following are components of a _______: Crown, Skirt and Rings
piston
Blow-by can be best defined as Escaping _______ gasses past the rings into the crankcase.
compression
The connecting rod attached to the ________ by the connecting rod journal.
crankshaft
Backlash is best described as the amount of space between the __________ of a gear tooth and the width of space between the matting gears.
thickness
Friction bearings usually support the crankshaft, connecting rod, _________ and gear train.
camshaft
Antifriction _________ are usually found in Cooling pumps, governors, starters, turbochargers and blowers. Mainly exterior areas of an engine.
Bearings
The purpose of the flywheel is to ______ the energy during the power event and release it during the remaining events of the operation cycle.
store
Terms that best describe the _______ of the camshaft are lift, duration, flank and nose.
construction
Cam lobes are eccentric projections that change ______ motion of the camshaft to the reciprocating motion needed to operate the valves, injectors and other components.
rotary
poppet valve is part of the actuating assembly that admits _____ air and discharges exhaust gases from the combustion space.
intake
Valve guides prevent undesirable side-to-side movement of the_____ in the cylinder head.
valve
A blower or supercharger is belt or _____ driven and provides instant boost pressure to the engine at all speeds.
gear
In an open cooling system the engine is cooled directly by _______ .
seawater
Harrison Plate Type of ______ _________ is used for oil only.
heat exchanger
Plate Type heat exchanger uses a pack of __________ plates with portholes for the passage of two fluids on either side of the plate.
corrugated
Magnesium anode can NEVER be used on _________ surfaces.
aluminum
Electronic Control Unit (ECU) controls the fuel injection quantity and ______ in the common rail type electronic controlled fuel system.
timing
Use a Plastigage to measure the _______ between a bearing journal and the bearing.
clearance
Exhaust is harnessed to do work in gas ______.
turbines
Annular and Can-Annular are the two types of _________ chambers/liners.
combustion
The gas turbine base enclosure assembly’s inner walls are designed to withstand a flame of 2000 degrees for _____ minutes.
15
Sinter Disc type of clutch discs has superb ______ dissipation and durability.
heat
Spherical _____ type reduction gear bearings accept radial and/or axial loads and help maintain alignment.
roller
Teflon shaft packing offers the ______ life.
longest
A stave is a ________ strip within a cutlass bearing.
rubber
Low operational temperatures are desirable and 230-dgrees Fahrenheit has been established as the _______ limit for general bearing applications.
maximum
The two common types of _______ agents affecting bearing alloys are electrolytes and organic acids.
corrosive
Packless Sealing System (PSS) used aboard the _______
47-foot motor life boats (MLBs).
Secure the propeller and ______ _______ against uncontrolled rotation when checking or working on open marine gears.
shaft line
The primary seal on a MX9 Stern Tube Seal is ________ face type of seal.
mechanical
Line Shaft bearings may also be known as ________ bearings.
spring
The governor _________ speed by regulating the amount of fuel supplied to the engine.
controls
Bearing load is divided into three types; Radial, _______, and radial thrust.
thrust
The hand can usually be held in contact with bearing surfaces _____ 131 °F.
below
For all periods of inactivity, inspect the _____ _____seal for leakage once every 24 hours.
stern tube
Jacket water _________ rise across an engine should not exceed 10 or 12 °F.
temperature
Blue hazy smoke is most likely an indication of _____ presence in combustion chamber.
L/O
When conducting _______ tests, the engine should be operated at 80 to 90% of the Coast Guard rated load.
performance
When conducting engine performance tests, the _____ ______ and engine jacket water should be within 5 degrees of their normal operating temperature.
lube oil
0.050” is the MAXIMUM allowable rudder ______ clearance for a 2” rudder shaft.
bearing
