Propulsion

Question 1

A ______ traveling in one direction constitutes a stroke.

Answer 1

Piston

Question 2

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.

Answer 2

fuel/air

Question 3

In a two stroke engine, _______ gases exit the cylinder through a hole in the cylinder wall.

Answer 3

exhaust

Question 4

In a two stroke engine, the ________ stroke of the piston pressurizes the air in the crankcase.

Answer 4

downward

Question 5

A _______ driven diaphragm fuel pump is typically found on a 4 stroke outboard engine.

Answer 5

mechanical

Question 6

The increase in speed of the air flow through the narrow section of a ________ throat is known as the venturi effect.

Answer 6

carburetor

Question 7

The purpose of the throttle body is to _______ air flow.

Answer 7

regulate

Question 8

An Oil Injection outboard engine system uses a pump to draw oil from a ________.

Answer 8

reservoir

Question 9

The Temperature Sensor provides the engine’s computer with temperature information for ______ and ignition optimization.

Answer 9

fuel

Question 10

The Gear Case transmits ______ power to the propeller.

Answer 10

engine

Question 11

In a jet drive system, the impeller is capable of pumping ______ _________ of water at relatively low pressures.

Answer 11

large volumes

Question 12

The Starter Solenoid is a _______ operated, semi-automatic switch used to relay power from the battery to the starter motor.

Answer 12

remotely

Question 13

A Magneto is generally used on smaller outboard engines to _______ electricity.

Answer 13

produce

Question 14

The Voltage Regulator _______ of an outboard engine has the ability to turn on and off as needed to regulate the charging/electrical system.

Answer 14

Rectifier

Question 15

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

Answer 15

Capacitor

Question 16

Most outboard motor manufacturers recommend a gear case oil _______ _______ every 50 operational hours and oil replacement every 100 operational hours.

Answer 16

level check

Question 17

Most outboard engine manufacturers recommend _______ _______ replacement once the engine reaches its first 100 hours.

Answer 17

spark plug

Question 18

Most outboard manufacturers recommend that you replace the engine’s _______ pump at least semi-annually.

Answer 18

water

Question 19

Fuel Injection occurs at or near the end of the ________ stroke and just before the power stroke.

Answer 19

compression

Question 20

In a four stoke diesel engine, ________ ________ is used to describe the timeframe during which both the intake and exhaust valves are open.

Answer 20

Valve Overlap

Question 21

In a two stroke diesel engine how many revolutions does the camshaft spin in relation to the crankshaft?

Answer 21

1:1

Question 22

In the two-stroke diesel engine combustion process, the power stroke starts after the ______ passes near TDC.

Answer 22

piston

Question 23

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.

Answer 23

cylinder

Question 24

The following are components of a _______: Crown, Skirt and Rings

Answer 24

piston

Question 25

Blow-by can be best defined as Escaping _______ gasses past the rings into the crankcase.

Answer 25

compression

Question 26

The connecting rod attached to the ________ by the connecting rod journal.

Answer 26

crankshaft

Question 27

Backlash is best described as the amount of space between the __________ of a gear tooth and the width of space between the matting gears.

Answer 27

thickness

Question 28

Friction bearings usually support the crankshaft, connecting rod, _________ and gear train.

Answer 28

camshaft

Question 29

Antifriction _________ are usually found in Cooling pumps, governors, starters, turbochargers and blowers. Mainly exterior areas of an engine.

Answer 29

Bearings

Question 30

The purpose of the flywheel is to ______ the energy during the power event and release it during the remaining events of the operation cycle.

Answer 30

store

Question 31

Terms that best describe the _______ of the camshaft are lift, duration, flank and nose.

Answer 31

construction

Question 32

Cam lobes are eccentric projections that change ______ motion of the camshaft to the reciprocating motion needed to operate the valves, injectors and other components.

Answer 32

rotary

Question 33

poppet valve is part of the actuating assembly that admits _____ air and discharges exhaust gases from the combustion space.

Answer 33

intake

Question 34

Valve guides prevent undesirable side-to-side movement of the_____ in the cylinder head.

Answer 34

valve

Question 35

A blower or supercharger is belt or _____ driven and provides instant boost pressure to the engine at all speeds.

Answer 35

gear

Question 36

In an open cooling system the engine is cooled directly by _______ .

Answer 36

seawater

Question 37

Harrison Plate Type of ______ _________ is used for oil only.

Answer 37

heat exchanger

Question 38

Plate Type heat exchanger uses a pack of __________ plates with portholes for the passage of two fluids on either side of the plate.

Answer 38

corrugated

Question 39

Magnesium anode can NEVER be used on _________ surfaces.

Answer 39

aluminum

Question 40

Electronic Control Unit (ECU) controls the fuel injection quantity and ______ in the common rail type electronic controlled fuel system.

Answer 40

timing

Question 41

Use a Plastigage to measure the _______ between a bearing journal and the bearing.

Answer 41

clearance

Question 42

Exhaust is harnessed to do work in gas ______.

Answer 42

turbines

Question 43

Annular and Can-Annular are the two types of _________ chambers/liners.

Answer 43

combustion

Question 44

The gas turbine base enclosure assembly’s inner walls are designed to withstand a flame of 2000 degrees for _____ minutes.

Answer 44

15

Question 45

Sinter Disc type of clutch discs has superb ______ dissipation and durability.

Answer 45

heat

Question 46

Spherical _____ type reduction gear bearings accept radial and/or axial loads and help maintain alignment.

Answer 46

roller

Question 47

Teflon shaft packing offers the ______ life.

Answer 47

longest

Question 48

A stave is a ________ strip within a cutlass bearing.

Answer 48

rubber

Question 49

Low operational temperatures are desirable and 230-dgrees Fahrenheit has been established as the _______ limit for general bearing applications.

Answer 49

maximum

Question 50

The two common types of _______ agents affecting bearing alloys are electrolytes and organic acids.

Answer 50

corrosive

Question 51

Packless Sealing System (PSS) used aboard the _______

Answer 51

47-foot motor life boats (MLBs).

Question 52

Secure the propeller and ______ _______ against uncontrolled rotation when checking or working on open marine gears.

Answer 52

shaft line

Question 53

The primary seal on a MX9 Stern Tube Seal is ________ face type of seal.

Answer 53

mechanical

Question 54

Line Shaft bearings may also be known as ________ bearings.

Answer 54

spring

Question 55

The governor _________ speed by regulating the amount of fuel supplied to the engine.

Answer 55

controls

Question 56

Bearing load is divided into three types; Radial, _______, and radial thrust.

Answer 56

thrust

Question 57

The hand can usually be held in contact with bearing surfaces _____ 131 °F.

Answer 57

below

Question 58

For all periods of inactivity, inspect the _____ _____seal for leakage once every 24 hours.

Answer 58

stern tube

Question 59

Jacket water _________ rise across an engine should not exceed 10 or 12 °F.

Answer 59

temperature

Question 60

Blue hazy smoke is most likely an indication of _____ presence in combustion chamber.

Answer 60

L/O

Question 61

When conducting _______ tests, the engine should be operated at 80 to 90% of the Coast Guard rated load.

Answer 61

performance

Question 62

When conducting engine performance tests, the _____ ______ and engine jacket water should be within 5 degrees of their normal operating temperature.

Answer 62

lube oil

Question 63

0.050” is the MAXIMUM allowable rudder ______ clearance for a 2” rudder shaft.

Answer 63

bearing