Powerplants Exam 1
The ________________ end of the engine is the rear end
Accessory
Engine classification by cooling method employed
Air cooled
The volume of any dry gas varies inversely with the absolute pressure sustained by it (providing the temperature remaining constant)
Boyle's Law
A device for actuating the valve lifting mechanism
Cam
When the pressure on a sample of a dry gas is held constant, the temperature and the volume will be in direct proportion
Charles' Law
Potential energy
Compressed spring Stored energy Gasoline
The link that transmits forces between the piston and the crankshaft of an engine
Connecting rod
Engine housing
Crankcase
Transforms the reciprocating motion of the piston to rotary motion for turning the propeller
Crankshaft
The part of an aircraft engine in which the chemical heat energy of the fuel is converted to mechanical energy
Cylinder
The amount of engine life obtained while maintain the desired reliability
Durability
A form of heat engine in which the fuel releases its energy outside of the engine
ECE
The law of conservation of energy states that
Energy can neither be created nor destroyed - only converted from one form of energy to another.
A reciprocating engine that has no need of spark plug to ignite the fuel/air mixture is the two-stroke cycle engine.
False
Currently, most of the aviation engines of reciprocating type are liquid-cooled.
False
Durability is measured as the mean time between failures, while reliability is measured as the mean time between overhauls.
False
In a twin-engine aircraft configuration where the engines are mounted below the wings, engine #1 is on the right-hand side, assuming the view from the rear of the airplane looking forward.
False
In a twin-engine aircraft configuration where the engines are mounted below the wings, engine #2 is on the left-hand side, assuming the view from the rear of the airplane looking forward.
False
Reciprocating engines are generally used to power aircraft designed to fly at high-altitudes and with high-speed.
False
The aircraft powerplant generates the required lift for flight.
False
The intake valves have hollow stems filled with metallic sodium to dissipate heat rapidly.
False
The upright inline type engines offer both greater pilot visibility and a possibility for shorter landing gear.
False
Turbine engines are generally used on small aircraft with low-power and low-cost requirements.
False
Two-stroke cycle engine has separate strokes for intake, compression, power, and exhaust.
False
When referring to the right side or left side of an aircraft engine, always assume the view is from the front or propeller shaft end.
False
The sequence in which the power event occurs in the different cylinders
Firing order
A mechanical device that converts the chemical energy in a fuel into heat energy, and then the heat energy is converted into mechanical energy and useful work
Heat engine
In the engine model code, "H" stands for ...
Horizontal
A form of heat engine in which the fuel and air mixture is burned inside the engine
ICE
Which are the two large subcategories of the heat engines?
ICE ECE
A form of heat engine in which the fuel and air mixture is burned inside the engine.
Internal combustion engine
Energy in motion
Kinetic
The basic power-developing components in a reciprocating engine are:
NOT Pushrod Camshaft Rocker arm Cylinder Piston Connecting rod Lifter
During the exhaust stroke:
NOT The cylinder moves toward the TDC The piston forces the burned gases out of the cylinder The intake valve is open The exhaust valve is open
The V-type engines:
NOT have a slightly greater frontal area compared with the in-line engine. are liquid cooled. have increased weight per horsepower compared with the in-line engine.
The opposed type engines:
NOT have low-weight-to-horsepower ratio. have lower vibration levels. are predominantly liquid-cooled.
Which of the following are examples of an air-breathing engine?
NOT Scramjet
In a rotary-type engine, the propeller is attached to the:
NOT crankshaft
In the engine model code, "O" stands for ...
Opposed
A plunger that moves back and for the or up and down within an engine cylinder
Piston
It is used to attach the piston to the connecting rod
Piston pin
Stored energy
Potential
The complete installation of an aircraft engine, propeller, and all accessories needed for its proper function
Powerplant
The ________________ shaft end of the engine is the front end
Propeller
The type of reciprocating engine that has the lowest weight-to-horsepower ratio
Radial
A type of heat engine that produces thrust by heating a mass of air inside the engine and discharging it at a high velocity through a specially shaped nozzle
Reaction
A type of heat engine that changes the reciprocating (back-and-forth) motion of piston inside the cylinders into rotary motion of a crankshaft
Reciprocating
The ability of an aircraft engine to perform its design functions under widely varying operating conditions
Reliability
A pivoted arm used to open and close the engine valves
Rocker arm
A type of aircraft engine in which the crankshaft is held stationary, and the cylinders rotate about the crankshaft
Rotary
The piston position, when farthest from the engine shaft, is called:
TDC.
The foundation of the reciprocation engine is:
The crankcase
Which of the following statements are true.
The engine piston is a movable wall of the combustion chamber. The engine piston works under high operating temperatures and pressures.
Which type of reciprocating engine does have the smallest frontal area resulting in low drag?
The in-line type
Which is the most popular type reciprocating engine for light conventional aircraft and helicopters?
The opposed type engine.
The valve mechanism component, which is situated between the pushrod and the valve, is:
The rocker arm
The valve mechanism component, which is situated between the camshaft and the valve pushrod, is:
The tappet or lifter
Boyle's Law states that
The volume of any dry gas varies inversely with the absolute pressure sustained by it (providing the temperature remaining constant)
A reciprocating engine that has separate strokes for intake, compression, power, and exhaust is also called a four-stroke cycle engine.
True
Currently, most of the aviation engines of reciprocating type are air-cooled.
True
In a twin-engine aircraft configuration where the engines are mounted below the wings, engine #1 is on the left-hand side, assuming the view from the rear of the airplane looking forward.
True
The cylinder head provides opening into which the spark plugs are inserted.
True
The valve-timing diagram gives a visual concept of the valve timing to the engine shaft rotation.
True
Turbine engines are generally used to power aircraft designed to fly at high-altitudes and with high-speed.
True
When referring to the right side or left side of an aircraft engine, always assume the view is from the rear or accessory end.
True
In the engine model code, "T" stands for ...
Turbocharged
Which of the following are examples of a reaction engine?
Turboprop Rocket
A four-throw type crankshaft is used in:
V-8 engines. Four-cylinder opposed engines.
Any device for regulating or determining the direction of flow of a liquid or gas
Valve
The jet-powered aircraft is a product of:
WWII
Kinetic energy
Water in a waterfall Flying aircraft Energy of motion
Charles' Law states that
When the pressure on a sample of a dry gas is held constant, the temperature and the volume will be in direct proportion
The rear end of an aircraft engine is the:
accessory end.
An aircraft V-type engine generally has:
an even number cylinders per row.
An opposed type engine generally has:
an even number cylinders.
Aircraft engines may be cooled by:
either air or liquid.
The connecting rod is made of :
either aluminum or steel alloy
The first successful aircraft engine had/was:
four cylinders liquid-cooled magneto ignition
The power delivered by a reciprocating engine is measured in:
horsepower.
When the engine piston draws fuel-air mixture in the cylinder:
is moving down.
When the engine piston transfers the force of the expanding gases to the engine shaft:
is moving down.
The cylinder barrel:
is provided with a mounting base is where the engine piston reciprocates
The crankcase provides
mountings for attachment to the airplane support for the attachment of the cylinders
A type of aircraft engine in which the cylinders and the crankshaft are mounted horizontally is a/an:
opposed type.
Plunger that moves back and forth or up and down within an engine cylinder is called:
piston
The power delivered by a turbojet engine is measured in:
pounds of thrust.
The valves are kept in a closed position by two or more helical-coil springs to:
provide redundancy and dump out all spring-surge vibrations during engine operation.
The counterweights:
provide static balance of the crankshaft.
The firing order of an aircraft engine:
provides for balance and dampens engine vibrations.
The valve seat:
provides the strong surface to withstand the constant hammering during valve operation.
The dynamic damper:
relieve the whip and vibration caused by the rotation of the crankshaft.
The piston pin is hollowed for lightness and is made of:
steel alloy
The crankshaft journal where the connecting-rod bearing is attaching to is called:
the crankpin the throw
The engine component that transforms the reciprocating motion of the piston and connecting rod to rotary motion for turning the propeller is:
the crankshaft.
The connecting rod is the link between:
the piston and the crankshaft of the engine.
The valve mechanism component, which is situated between the valve lifter and the rocker arm, is:
the pushrod
In a twin-engine aircraft configuration where the engines are mounted below the wings, engine #1 is on the left-hand side, assuming the view from:
the rear of the airplane looking forward.
For each revolution of the crankshaft,
there are two strokes of the piston.
Any device used to regulate or direct a flow of a liquid, gas, etc. is called a:
valve.
The engine part that is attaching the piston to the connecting rod is the:
wrist pin.
