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94 Cards in this Set
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In a diesel engine, internal combustion causes the piston to move by? A. Pressure of gases produced by the burning of the fuel and air in the cylinder B. The admission of fuel and air into the combustion space C. Specially designed parts connected to shaft D. The concept of reciprocity |
B. The admission of fuel and air into the combustion space |
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In describing engine operation, which of the following definitions refers to the term "cycle"? A. One rotation of the engine engine crankshaft B. One stroke of the piston C. The rotation of the crankshaft that produces the turning of the jacking gear D. The sequence of events that produce a power pulse |
D. The sequence of events that produce a power pulse |
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What factors determine the number of events occurring in a cycle of operation? A. Crankshaft revolution B. Distance a piston travels during a stroke C. Number of piston D. Type of engines ( diesel or gasoline) |
D. Type of engines ( diesel or gasoline) |
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The combustion cycle specifically refers to which of the following facts? A. The mechanics of engine operation B. Period of 2 combustion cycles C. Cycles of two operation D. Mechanical cycle of operation |
A. The mechanics of engine operation |
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The 2 strokes of a 2 stroke cycle engine are? A. Power and intake B. Compression and power C. Intake and exhaust D. Exhaust and compression |
B. Compression and power |
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What is the relationship between the temperature developed in a combustion space and the compression ratio of the engine? A. Higher compression ratios create higher temperatures B. Lower temperatures create higher compression ratios C. Lower temperatures creates higher compression ratios D. Higher compression ratios create lower temperatures |
D. Higher compression ratios create lower temperatures |
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An indicator card, or pressure-volume diagram, shows graphically The? A. Compression ratio of the engine B. Relationship between pressure and volume during one cycle of the engine C. Volume of the engine D. Relationship between pressure and volume during one stroke of the engine |
B. Relationship between pressure and volume during one cycle of the engine |
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In an opposed piston engine the term crank Lead means that? A. 1 crankshaft turns faster than the other B. The two crankshafts turn in different directions C. One piston in a cylinder reaches inner dead center when the other reaches outer dead center D. One piston in a cylinder reaches inner dead center before the other |
D. One piston in a cylinder reaches inner dead center before the other |
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The difference in crank lead between the upper and lower cranks of the engine causes the lower shaft to? A. Operate most of the engines accessories B. Longer combustion events C. Exhaust events starting before Scavenging events D. Rotates faster than the upper shaft |
C. Exhaust event starting before Scavenging events |
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A Dye penetrant Test meets the requirements for quality assurance when it is conducted by what person? A. QA inspector B. Any qualified person C. Certified nondestructive testing technician D. Well trained engineman |
C. Certified nondestructive testing technician |
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Which of the following conditions is not a cause for the liner to be improperly seated? A. Metal chips B. Nicks or burrs C. Improper fillets D. Oversized liner |
D. Oversized liner |
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Which of the following symptoms is an indication of scored cylinder? A. Low compression pressure B. High compression pressure C. Rapid wearing out of strainer and liner parts D. Cracked or broken piston rings |
B. High compression pressure |
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What condition is not a cause of abnormal liner wear? A. Insufficient lubrication B. Improper starting procedures C. Dirt in the lube oil D. High cooling water temperature |
C. Dirt in the lube oil |
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You are removing a cylinder liner from an engine. When fastening the special liner puller to the liner studs, why must you tighten the Caps by hand instead of by wrench? A. Because the nuts cannot be reached with a wrench B. Because threads on both nuts and studs could be damaged by the wrench C. Because the cylinder liner could be scratched with the wrench D. Because there is some danger that the wrench could be left in the cylinder liner |
B. Because threads on both nuts and studs could be damaged by the wrench |
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The gaskets which are used between the mating surfaces of the heads and the blocks of an engine give this joint which of the following characteristics? A. Acid resistance B. Rigidity C. Protection against leakage D. Correct shape |
C. Protection against leakage |
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What symptoms do not indicate fouling in the combustion chamber? A. Excessive oil pumping B. Low compression C. Smoky exhaust D. Loss of power |
B. Low compression |
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Which of the following conditions will not cause cracks on an engine cylinder head? A. Obstruction in the combustion space B. Restriction of the cooling passages C. Addition of hot water to a cold engine D. Improperly tightened studs |
C. Addition of hot water to a cold engine |
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After inspecting the engine intake valves, you discovered that the surface of the valve head has damage. Which of the following casualties is the most probable cause? A. It is sticking B. It is bent C. It has a weak spring D. It has a loose valve seat |
B. It is bent |
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Minor pits and flaws may be removed from the valves seat by what method? A. Buffing B. Insert replacements C. Hand grinding D. Rubbing with Prussian Blue |
C. Hand grinding |
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If the threads on a rocker arm adjusting screw become worn, what must you do? A. Replace the screw only B. Replace the screw and lock nut only C. Dress the threads on the screw D. Replace the rocker arm, screw and lock nut |
D. Replace the rocker arm, screw and lock nut |
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What is the most frequent maintenance requirement for rocker arms? A. Reaming the bushing on the rocker arm B. Inspecting the rocker arm ends for wear C. Checking tappet clearance and lock nut tightness D. Replacing tappet adjusting screws and lock nuts |
C. Checking tappet clearance and lock nut tightness |
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When a lash adjuster is adequately supplied with oil, what will most likely cause it to operate noisily? A. Excessive clearance B. Broken parts C. Dirt, resin or abrasive particles D. Missing check ball or spring |
C. Dirt, resin or abrasive particles |
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Why is it necessary to scrape around the top of a cylinder bore before pulling the Piston? A. To increase clearance for the piston B. To remove any metal ridge and carbon deposits C. To remove abrasive particles and gum D. To free the piston rings |
A. To increase clearance for the piston |
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When using a brass drift to remove frozen piston ring, you must avoid damaging which of the following parts? A. The rings B. The drift C. The land D. The camshaft |
C. The land |
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Operation of an internal combustion engine above specified temperature limits may result in which of the following problems? A. Low cylinder temperatures B. Increased oil viscosity C. Low oil temperature D. Lack of lubrication of the cylinder walls |
D. Lack of lubrication of the cylinder walls |
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You are installing a new sleeve bearing. Which of the following procedures will make it easier to insert the new sleeve bearing? A. Apply plenty of grease to the bushing B. Shrink the sleeve bearing with dry ice C. Shrink the Piston with dry ice D. Heat the sleeve bearing in the oven |
B. Shrink the sleeve bearing with dry ice |
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To measure the clearance between a piston pin and bushing which of the following items should you use? A. Feeler gauge B. Micrometer C. Leads D. Prussian Blue |
B. Micrometer |
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Crankshaft journals that exceed the specified tolerance for out of roundness should be refinished by which of the following means? A. Stoning B. Grinding C. Filing D. Scraping |
B. Grinding |
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What instrument is used to take crank web deflection readings? A. Feeler gauge B. Outside micrometer C. Strain gauge D. Gauge block |
C. Strain gauge |
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What is the recommended corrective action for Journal bearings that have small raised surfaces or minor pits? A. Replace the bearing B. Stone down the raised surfaces C. Grind the surfaces with a hand grinder D. Smooth the surface with a bearing scraper |
D. Smooth the surface with a bearing scraper |
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Which of the following senses is not used by the diesel engine troubleshooter? A. Smell B. Taste C. Sight D. Hearing |
B. Taste |
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When a diesel engine can neither be cranked nor barred over, which of the following troubles is most probably indicated? A. Depleted Air Supply B. Open cylinder relief valve C. Improperly engaged turning gear D. Out of Time air starting motor |
C. Improperly engaged turning gear |
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An engine cannot be cranked, but it can be barred over. Which of the following is the most probable fault? A. Improper throttle setting B. Tripped over speed C. Engaged jacking Gear interlock D. Seized piston |
C. Engaged jacking gear interlock |
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In general what should you do if a pressure actuated air starting valve is not functioning properly because of a weak return spring? A. Placed another washer on top of the valve stem B. Replace castellated nut with a heavier one C. Restress the valve return spring D. Install a new return spring |
D. Install a new return spring |
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Metal fatigue in the nipple of a fuel system is usually caused by which of the following factors? A. Leakage B. High injection pressure C. Vibration D. Erosion |
C. Vibration |
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Which of the following problems is likely to cause failure of a diesel engine mechanical governor? A. Faulty oil seal B. Bound control linkage C. Defective starting valve D. Low oil level |
B. Bound control linkage |
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Most diesel engines are equipped with a special means of cutting off their air or fuel supply in an emergency. In which of the following situations would the special means be used? A. Engine cannot be cranked or barred over B. Parts of the exhaust system are obstructed C. Fuel oil injection system is not properly timed D. Overspeed safety device does not operate when speed becomes excessive |
D. Overspeed safety device does not operate when speed becomes excessive |
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In the Fulton-Sylphon automatic temperature regulator, what happens if you decrease the spring tension? A. The velocity of the cooling water decreases B. The temperature range of the regulator increases C. The temperature range of the regulator decreases D. The velocity of the cooling water increases |
C. The temperature range of the regulator decreases |
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Which of the following conditions is a major contributing factor to diesel engine power loss, starting failure and frequent stalling? A. High cooling water temperature B. Faulty operation of the governor C. Improperly engaged jacking gear D. Faulty air starting distributor |
B. Faulty operation of the governor |
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A leaking fuel injector may cause an engine to? A. Stop B. Overheat C. Operate better D. Continue to operate when you attempt to shut it down |
D. Continue to operate when you attempt to shut it down |
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What must you do an improperly operating safety valve when it is removed from an engine cylinder? A. Reset the spring tension B. Replace the shear pin C. Machine and lap the valve D. Replace it with a new one |
A. Reset the spring tension |
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When cleaning the cylinder ports of an engine, you can prevent carbon from entering the cylinder by performing which of the following actions? A. Using a vacuum cleaner while brushing off the carbon B. Jacking the engine over to a position that the piston ports are blocked C. Covering the intakes of the cylinders D. Blowing down the engine with air after you are finished |
B. Jacking the engine over to a position that the piston ports are blocked |
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Which of the following problems can result from over priming a gasoline engine? A. Overheated engine B. Inoperative engine C. Stuck piston rings D. Corroded piston crowns |
C. Stuck piston rings |
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Most oil used by the navy can be heated to what maximum temperature without damaging the oil? A. 180°F B. 185°F C. 190 °F D. 195°F |
A. 180°F |
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The size of the discharge ring used in a purifier is determined by which of the following factors? A. Viscosity of the oil B. Moisture content of the oil C. Sediment in the oil D. Specific gravity of the oil |
D. Specific gravity of the oil |
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Diesel engines are classified as reciprocating internal combustion engines because of which of the following actions? A. Use energy from fuel burned outside their cylinder B. Burn fuel in a combustion chamber that moves back and forth C. Burns fuel in a confined chamber where the energy from the fuel moves a piston back and forth D. Use a continuous combustion process to impart rotary motion to the piston |
B. Burns fuel in a combustion chamber that moves back and forth |
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The thermal energy produced by thermal combustion in an engine is transformed into what kind of energy? A. Expansion B. Internal C. External D. Mechanical |
D. Mechanical |
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One cycle of engine operation includes? A. One combustion cycle B. One mechanical cycle C. With a half of a mechanical or an entire mechanical cycle depending on the type of the engine D. One mechanical and one combustion cycle |
D. One mechanical and one combustion cycle |
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When is fuel injected into a cylinder of a diesel engine? A. Before air in the cylinder is compressed B. After air in the cylinder is compressed C. After combustion gases in the cylinder have expanded D. As air is taken into the cylinder |
B. After air in the cylinder is compressed |
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What two events occur simultaneously in a 2 stroke cycle engine? A. Scavenging and compression B. Exhaust and scavenging C. Ignition and expansion D. Exhaust and compression |
B. Exhaust and scavenging |
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After ignition of the fuel and before the piston reaches TDC, there is little change in which of the following conditions on a diesel engine? A. Pressure B. Temperature C. Energy D. Volume |
D. Volume |
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An engine having a combustion chamber ,located between a cylinder head and the crown of a piston is which of the following types? A. Double acting B. Single acting C. Horizontal acting D. Opposed acting |
D. Opposed acting |
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Crank lead is used to cause which of the following conditions? A. Longer combustion events B. Exhaust events lasting longer than scavenging events C. Exhaust events starting before scavenging events D. Higher combustion temperatures |
B. Exhaust events lasting longer than scavenging events |
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Before you begin an inspection or test of an engine frame or block, what should you do first? A. Consult the manual because specific procedures vary with engines B. Check the engines preventative maintenance schedule C. Clean the outside of the engine thoroughly D. Warm up the engine |
C. Clean the outside of the engine thoroughly |
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Broken piston rings will cause which of the following problems? A. Scored cylinder liners B. Connecting bearing failure C. High lube oil temperature D. High freshwater temperature |
A. Scored cylinder liners |
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How do you determine liner wear? A. Take piston and liner measurement and get the difference B. Take measurement at three levels in the liner C. Compare wear of the piston rings D. Compare compression readings |
B. Take measurement at three levels in the liner |
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Under which of the following conditions are corrosive vapors most likely to condense on the cylinder walls of an engine? A. While operating at temperatures exceeding normal B. While operating with the lube oil pressure below normal C. While warming up after it is first started D. While operating in such a way that normal lube oil pressure is exceeded |
B. While operating with the lube oil pressure below normal |
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You are inspecting a cylinder head for cracks. Which of the following is not a correct procedure to use? A. Perform a compression test B. After bringing the piston of each cylinder to TDC, apply compressed air C. Examine by sight or with magnetic powder D. Perform a hydrostatic test that is used on a water jacket cylinder |
A. Perform a compression test |
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What sbould you do if you discover a warped or distorted cylinder head during an inspection? A. Machine the head to correct tolerance B. Replace the head as soon as possible C. Over torque the head to compensate for the warpage D. Reduce the load on the engine |
B. Replace the head as soon as possible |
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What valve problems will cause a valve to hang open? A. Burned B. Floating C. Sticking D. Bent |
D. Bent |
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What valve casualty is usually caused by desirous deposits left by improper lube oil or fuel? A. Burned B. Sticking C. Weak D. Bent |
B. Sticking |
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Which of the following valve casualties will cause the valves to fail to close completely? A. Burned B. Floating C. Sticking D. A weak spring |
D. A weak spring |
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When replacing a valve seat insert, which of the following procedures should you follow? A. Plan the operation so that the insert is placed slowly and precisely B. Use boiling water to heat the valve seat C. Drive the insert down with a special tool D. Shrink the valve guide or counterbore with dry ice |
C. Drive the insert down with a special tool |
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Which of the following defects does not warrant valve spring replacement? A. Lose of 2% of length B. Damage to protective coating C. Hairline cracks D. Rust pits |
A. Loss of 2% of length |
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To adjust the intake Tappet valve of a 4 stroke cycle engine , the piston must be in what position? A. On the intake stroke B. On the compression stroke C. Between the compression and power stroke D. Between the intake and compression stroke |
B. On the compression stroke |
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After setting a tappet clearance and locking the adjusting screw with a locknut, what is your next step? A. Recheck the clearance B. Adjust the next tappet C. Warm the engine and reset the clearance D. Check the manufacturer's manual to see if the clearance is correct |
A. Recheck the clearance |
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Whih of the following actions should you take to insert a camshaft into the camshaft recess? A. Rotate as you push it in B. Shake it up and down C. Apply grease to it D. Hit it with a sledge |
A. Rotate as you push it in |
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To scour the top of a cylinder bore before pulling it out of the piston, you should use which of the following tools? A. Power grinder B. File C. Metal scraper D. Emery cloth |
C. Metal scraper |
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In addition to ring gap, what other factors must you measure to ensure correct ring fit? A. Ring end gap B. Ring to land clearance C. Ring width D. Ring circumference |
B. Ring to land clearance |
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If the oil flow to a piston is restricted, where will the deposits be formed? A. On the underside or the piston crown B. Behind the compression ring C. On the piston walls D. On the topside of the piston crown |
A. On the underside or the piston crown |
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When inserting new piston bushing, what are three things you must check? A. Alignment, clearance and appearance B. Cleanliness, clearance and appearance C. Appearance, alignment and cleanliness D. Cleanliness, alignment and clearance |
D. Cleanliness, alignment and clearance |
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A rough spot or slIght score on a crankshaft journal should be removed by dressing with which of the following material? A. Fine sandpaper B. Rough sandpaper C. Fine oilstone D. Grinder |
C. Fine oilstone |
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Impending bearing failures may be indicated by which of the following factors? A. Higher than normal lube oil pressure and lower than normal lube oil temperature B. Lower than normal lube oil pressure and higher than normal lube oil temperature C. Higher than normal lube oil pressure and temperature D. Lower than normal lube oil pressure and temperature |
B. Lower than normal lube oil pressure and higher than normal lube oil temperature |
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Which of the following means of determining clearances will not leave an impression in the soft bearing metal? A. Leads B. Shim stock C. Feeler gauge D. Plastigage |
D. Plastigage |
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Which of the following actions will be the greatest aid in detecting minor leaking? A. Standing watch B. Conducting administrative inspection C. Conducting material inspection D. Conducting routine cleaning |
C. Conducting material inpsection |
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Which of the following is a symptom of excessive clearance between a piston and its cylinder? A. Piston slap B. Less oil consumption C. Minimal carbon deposits D. Blue exhaust |
A. Piston slap |
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If an engine cannot be cranked, but can be barred over, which of the following systems is the most probable source of trouble? A. Starting B. Fuel C. Ignition D. Lubrication |
A. Starting |
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Which of the following practices tends to reduce or eliminate the formation of gummy deposits that cause upper and lower piston of pressure activated air starting valves to stick in the cylinders? A. Increasing the tension of the valve return spring B. Drain the storage tank and water traps of the air starting system C. Jacking the engine over manually before starting to free any valves that may be stuck D. Decreasing the tension of the valve return spring |
B. Drain the storage tank and water traps of the air starting system |
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What is the main reason for troubles in the fuel and injection pumps? A. Contaminated fuel B. Improper adjustments C. Coated fuel lines D. Excessive vibrations |
A. Contaminated fuel |
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What are the two main causes of leakage in fuel tanks? A. Corrosion and excessive fuel line pressure B. Metal fatigue and improper welds C. Vibration and metal fatigue D. Clogged fuel lines and corrosion |
B. Metal fatigue and improper welds |
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Which of the following actions will cause the overspeed safety device of an engine to become inoperative? A. Trying to start the engine with low air starting pressure B. Tripping the device accidentally while trying to start the engine C. Shutting off the fuel supply after starting the engine D. Shutting off the air supply after starting the engine |
B. Tripping the device accidentally while trying to start the engine |
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What diesel engine system is likely to be at fault if a cylinder misfires regularly? A. Lubrication B. Fuel C. Exhaust D. Ignition |
B. Fuel |
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What corrective actions should you take if the water in the cooling system of a diesel emergency generator overheats because the thermostat fails to function? A. Clean the bellows of the element B. Adjust the tension of the regular spring C. Clean the freshwater cooler D. Replace the thermostat |
D. Replace the thermostat |
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Which of the following troubles in the engine exhaust system will cause back pressure? A. Obstruction in the combustion space B. Thermostat failure C. Restricted exhaust D. Restricted oil filter |
C. Restricted exhaust |
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How can you determine whether blower rotor gears are worn excessively? A. Measure the clearance between the leading and the trailing edges of the rotor lobes B. Measure the backlash of the gear sets C. Measure the clearance between the rotor lobes and the casing D. Check the timing of the rotors |
A. Measure the clearance between the leading and the trailing edges of the rotor lobes |
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What should you do immediately after disconnecting the linkage to the governor, if you are checking an engine for a stuck control rack? A. Visually inspect the rack B. Try to move the rack by hand C. Test the return springs D. Clean and remove rack |
B. Try to move the rack by hand |
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Which of the following is a result of the engine having clogged exhaust ports during operation? A. Low exhaust temperature B. Overheating of the lube oil C. Popping of the cylinder safety valves D. Dirty fuel oil |
C. Popping of the cylinder safety valves |
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What kind of noise will most likely be coming from an engine operating with a broken engine part? A. Rattling B. Clicking C. Pounding D. Knocking |
C. Pounding |
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When the starting motor of a gasoline engine turns but fails to crank the engine, the trouble is usually found where? A. Drive assembly B. Engine timing C. Fuel system D. Ignition system |
D. Ignition system |
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You are checking for trouble in a fuel system that has a wobble pump. If the pump feels or sounds dry, where is the most likely cause? A. In the carburetor B. In the line to the fuel pump C. In the fuel pump D. Between the fuel pump and the supply pump |
D. Between the fuel pump and supply pump |
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Oil purifiers are designed to give maximum efficiency when you operate the purifier at what limits? A. Minimum speed B. A speed determined by prevailing conditions C. A speed between minimum and maximum and below rated speed D. Maximum designed speed and rated capacity |
D. Maximum designed speed and rated capacity |
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When the military symbol 9250 lube oil is to be purified, it should be heated to what specific temperature? A. 140°F B. 160°F C. 175°F D. 180°F |
D. 180°F |
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What is the best method of determining the efficiency of a purifier? A. Oil clarity test B. Oil analysis C. Batch process D. Bowl sediment check |
B. Oil analysis |
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A cyliner compression leak is indicated when the pressure in a particular cylinder of an engine signals which of the following conditions? A. It is much higher than the pressure in the other cylinders B. It is much lower than the pressure in the other cylinders C. It fluctuates from normal to much below specified pressures D. It fluctuates from normal to much above specified pressures |
B. It is much lower than the pressure in the other cylinders |
