Exam 1 Questions Flashcards
The type of engine selected for an aircraft generally depends largely on?
Aircraft’s Cruising Speed
Generally, the more cylinders an engine has _____?
The more power it can produce
An aircraft engine must be designed to run at _____% power most of the time
65% - 75%
The first engine to convert steam into mechanical power was the ______?
Aeolipile
The “cycle” of a reciprocating engine is called the _______ cycle.
Otto
A big advantage of a radial engine is that they are very _______.
Resistant to damage
Select the engine that has the highest horsepower-to-weight ratio.
Inline
Opposed
V-type
Radial
Radial
Which selection below does not belong in a list of how aircraft engines are classified
Turbo-charging
Cooling Method
Cylinder Arrangment
Displacement
Turbo-charging
Displacement of an engine is?
The total amount of gases displaced by the piston during a stroke, expressed in cubic inches
The component which transforms the reciprocating motion of the piston and connecting rod into rotary motion for turning the propeller is?
Crankshaft
The component between the piston and the crankshaft
Connecting Rod
An engine that uses a master and articulating rods would be a ______ engine.
Radial
The engine part designed to keep the fuel/air charge in the combustion chamber is a ______?
Compression Ring
Match the type of bearing with its designed use. (Radial Loads, Thrust Loads, Radial and Thrust Loads)
Plain Bearing
Ball Bearing
Roller Bearing
Plain Bearing > Radial Loads
Ball Bearing > Thrust Loads
Roller Bearing > Radial and Thrust Loads
The purpose of an oil ring on a piston is to prevent gases from escaping past the piston during the compression stroke. T or F?
False
Boyle’s Law
Direct relation between pressure and temperature. As pressure increases, temperature will also increase proportionally.
Charle’s Law
Inverse relation between pressure and volume. As pressure increase volume decreases. As volume decreases, pressure increases.
The distance a piston moves from BDC to TDC is the _______.
Stroke
The part of an engine that holds the valves and valve operating mechanism, also forms the ______.
Combustion Chamber
The component that houses the reciprocating parts and is considered to be the “foundation of the engine” is the _________.
Crankcase
Select the type of Connecting Rod used by a Radial Engine.
Master and Articulated
What component is considered to be the “backbone” of the internal-combustion engine?
Crankshaft
These are used on a Crankshaft to relieve the whipping and vibration caused by the rotation.
Dynamic Dampers
The type of propeller shaft for low powered aircraft and that is integral to the crankshaft (actually a part of it)
Tapered
The device on a piston that prevents fuel-air mixture from escaping the combustion chamber.
Compression Ring
The component that conducts heat away from the piston to the piston walls is ________?
Piston Rings
The part of the engine that forms the combustion chamber is the _________?
Cylinder Head
Device within the engine that controls or regulates the direction of flow of a fluid or gas is a _________?
Valve
The opening into the combustion chamber of a reciprocating engine is a ________?
Port
Component that holds a valve closed
Valve spring
Engine component that actuates the valve operating mechanism is the ________?
Camshaft
The camshaft is turned by the?
Crankshaft
Match the component with the correct description of its function. (Power or not power producing)
Crankshaft
Valves
Cylinder Head
Connecting Rod
Camshaft
Piston
Cylinder
Crankshaft (Power producing)
Valves (Not power producing)
Cylinder Head (Not Power producing)
Connecting Rod (Power Producing)
Camshaft (Not power producing)
Piston (Power Producing)
Cylinder (Power Producing)
Volumetric Efficiency
The ratio of the volume of the fuel-air charge burned by the engine at atmospheric pressure and temperature to the piston displacement.
Thermal Efficiency
The ratio of the heat energy converted into useful work to the heat energy contained in the fuel
Mechanical Efficiency
The ratio of BHP to IHP, showing the percentage of power developed in the cylinders that actually reaches the propeller shaft
The crankshaft rotates 360 degrees for each stroke of the engine. T or F?
False
At what point in the operating cycle of an engine does ignition take place?
Just before TDC
The ___________________________ of an engine is the ratio of the volume of space in the cylinders when the piston is at the bottom of its stroke to the volume when the piston is at the top of its stroke.
Compression Ratio
Which engine efficiency is increased by valve overlap?
Volumetric
_______ is the horsepower developed by the ending, that is, the total horsepower converted from heat energy to mechanical energy.
IHP
__________ is the actual horsepower delivered by an engine to a propeller or other driven device. It is IHP minus the friction horsepower.
BHP
