Final Exam
Primary responsibility for compliance with Airworthiness Directives lies with the _____________________________.
Aircraft owner or operator.
Properly certificated mechanic holding an Inspection Authorization who conducts appropriate inspections.
Certificated mechanic who maintains the aircraft.
The three main parts of a crankshaft are the main journals, crankpins and propeller flange.
True
False
One location where a plain bearing may be used in a reciprocating engine are on the magneto drive shaft.
True
False
To aid in cooling, hollow exhaust valves may be filled with liquid freon.
True
False
The following engine designation, TSIO-550, indicates that we have a turbocharged, supercharged, inline, vertically opposed, 550 cubic inch displacement engine.
True
False
The purpose of dynamic dampers are to reduce vibration and to balance the power pulses in the engine.
True
False
Compression ratio is the ratio between the _____________________________.
Cylinder volume with piston at bottom dead center and at top dead center.
Combustion chamber pressure on the combustion stroke and on the exhaust stroke.
Piston travel on the compression stroke and on the intake stroke
Master and articulated rod assemblies are used in _____radial_____ type engines.
True
False
Airworthiness Directives are issued primarily to _____________________.
Present recommended maintenance procedures for correcting potentially hazardous defects.
Correct an unsafe condition that has been found and likely to exist in products of similar type and design
Provide information about malfunction or defect trends.
The different types of piston designs are flat, recessed, domed and cupped.
True
False
Piston ring gaps are staggered to prevent blow-by.
True
False
The five events of a four-stroke cycle engine in the order of their occurrence are ___________________.
Intake, compression, ignition, power, exhaust.
intake, power, compression, ignition, exhaust.
Intake, ignition, compression, power, exhaust.
Under the Federal Aviation Regulations, an aviation maintenance technician is required to perform maintenance on an aircraft so that it______________________.
Always meets its original type design.
Exceeds minimum standards with regard to aerodynamic function, structural strength, resistance to vibration, and other qualities affecting airworthiness
Is at least equal to its original or properly altered condition.
Connecting rods attach the _____piston______ to the _____crankshaft________.
True
False
One function of a reciprocating engine piston is to transmit the force of combustion to the camshaft.
True
False
On a four-stroke cycle engine, the following will occur. Intake valve opens ______on the intake stroke____________________. Intake valve closes ______on the compression stroke____________________. Exhaust valve opens _____on the intake stroke____________________. Exhaust valve closes _____on the power stroke____________________. Ignition occurs _____on the compression stroke_________.
True
False
If air/fuel ratio is proper and ignition timing is correct, the combustion process should be completed ___________________________________________.
20 to 30° before top center at the end of the compression stroke.
Just after top center at the beginning of the power stroke.
When the exhaust valve opens at the end of the power stroke.
Chromed cylinders are, “channeled” to create microcracks on the cylinder walls to retain oil.
True
False
The primary concern in establishing the firing order for an opposed engine is to _____________________.
Provide for balance and eliminate vibration to the greatest extent possible.
Keep power impulses on adjacent cylinders as far apart as possible in order to obtain the greatest mechanical efficiency.
Keep the power impulses on adjacent cylinders as close as possible in order to obtain the greatest mechanical efficiency.
What is the principal advantage of using propeller reduction gears?
To enable the propeller RPM to be increased without an accompanying increase in engine RPM
To enable the engine RPM to be increased with an accompanying increase in power and allow the propeller to remain at a lower, more efficient RPM.
To enable the engine RPM to be increased with an accompanying increase in propeller RPM.
Two functions of piston rings are to push oil into the cylinder and prevent hydraulic lock.
True
False
The most common type of reciprocating engine in production today is the diesel engine because of stricter fuel bands.
True
False
4 types of aircraft reciprocating engines are the radial, in-line, v-type and opposed type engines.
True
False
The purpose of two or more valve springs in aircraft engines is to ___________________.
equalize side pressure on the valve stems.
Equalize valve face loading.
Eliminate damaging vibration
The two types of engine crankcases are sectional and spilt half cases.
True
False
What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?
Oil viscosity valve.
Oil pump.
Oil pressure relief valve.
Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of
Oil at a specific temperature.
Distilled water at a specific temperature.
Mercury at a specific temperature.
The viscosity of a liquid is a measure of its
Rate of change of internal friction with change in temperature.
Resistance to flow.
Weight, or density.
What type of oil does most engine manufacturers recommend for new reciprocating engine break-in?
Semi-synthetic oil.
Ashless-dispersant oil.
Straight mineral oil.
What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods
The oil becomes diluted with gasoline washing past the pistons into the crankcase.
The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles.
Exposure to heat and oxygen causes a decreased ability to maintain a film under load.
Which of the following has the greatest effect on the viscosity of lubricating oil?
Engine RPM
Temperature.
System pressure.
What type of oil does most engine manufacturers recommend after new reciprocating engine break-in?
Ashless-dispersant oil.
Metallic-ash detergent oil.
Straight mineral oil.
The oil used in reciprocating engines has a relatively high viscosity due to
the reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure).
The relatively high rotational speeds.
Large clearances and high operating temperatures.
In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?
Engine oil below normal operating temperature.
Engine stopped with no oil flowing after runup.
Engine oil above normal operating temperature.
Cylinder walls are usually lubricated by
A direct pressure system fed through the crankshaft, connecting rods, and the piston pins to the oil control ring groove in the piston.
Splashed or sprayed oil.
Oil that is picked up by the oil control ring when the piston is at bottom center.
What advantage does mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?
Friction resistance.
Cooling ability
Chemical stability.
In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a
vent.
Bypass valve.
Relief valve.
The recommended aircraft engine lubricants are
Mineral or synthetic based.
animal, mineral, or synthetic based.
Vegetable, mineral, or synthetic based.
As an aid to cold-weather starting, the oil dilution system thins the oil with
alcohol.
gasoline.
Kerosene.
What will result if an oil filter becomes completely blocked?
Oil will flow at the normal rate through the system.
Oil flow to the engine will stop.
Oil will flow at a reduced rate through the system.
If an oil filter element becomes completely clogged, the
Oil will be bypassed back to the oil tank hopper where larger sediments and foreign matter will settle out prior to passage through the engine.
Bypass valve will open and the oil pump will supply unfiltered oil to the engine.
Oil supply to the engine will be blocked
How does high-tension ignition shielding tend to reduce radio interference?
Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads.
Prevents ignition flashover at high altitudes.
Reduces voltage drop in the transmission of high-tension current.
A cylinder's compression is considered failed once it falls below 20% of its rated pressure.
True
False
When removing a shielded spark plug, which of the following is most likely to be damaged?
Center electrode.
Core insulator.
Shell section.
The primary coil has a greater number of turns than the secondary coil.
True
False
The primary coil has a greater number of turns than the secondary coil.
True
False
When timing a magneto internally, the alignment of the timing marks indicates that the __________________.
Magnets are in the E-gap position.
Breaker points are just closing.
Magnets are in the E-gap position.
Which of the following contains a minimum checklist for 100-hour inspections of engines?
14 CFR Part 33 Appendix A.
Engine Specifications or Type Certificate Data Sheets
14 CFR Part 43 Appendix D.
When the switch is off in a battery ignition system, the primary circuit is __________________.
Opened.
Shorted.
Grounded.
What is the difference between a low-tension and a high-tension engine ignition system?
A low-tension system produces relatively low voltage at the spark plug as compared to a high-tension system.
A high-tension system is designed for high-altitude aircraft, while a low-tension system is for low- to medium-altitude aircraft.
A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.
The electrical circuit from the spark plug back to the magneto is completed by grounding through the __________________.
P-lead.
Engine structure.
Cockpit switch
When using a timing light to time a magneto to an aircraft engine, the magneto switch should be placed in the __________________.
LEFT or RIGHT position (either one).
BOTH position.
OFF position.
Two ways the magnetos are mounted to an aircraft engine are either base or flange type.
induced when the primary circuit is interrupted.
Induced when the primary circuit discharges via the breaker points.
Conducted from the primary winding via the discharge of the capacitor.
When inspecting an aircraft reciprocating engine what document is used to determine if the proper magnetos are installed?
Engine Manufacturer's Maintenance Manual
Aircraft Engine Type Certificate Data Sheets
Instruction for continued airworthiness issued by the engine manufacturer
Which of the following would be cause for rejection of a spark plug?
Carbon fouling of the electrode and insulator.
Insulator tip cracked.
Lead fouling of the electrode and insulator.
{"name":"Final Exam", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"Primary responsibility for compliance with Airworthiness Directives lies with the _____________________________., The three main parts of a crankshaft are the main journals, crankpins and propeller flange., One location where a plain bearing may be used in a reciprocating engine are on the magneto drive shaft.","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}