Stationary Engines Fundamentals Flashcards
What is an Engine?
A mechanical device that converts, fuel chemical energy, and then converting it in to mechanical energy.
The rate at which work is being done?
Power
What does a Vacuum gauge reads at atmospheric pressure?
29.92 inches mercury
What should be done before working on a large engine?
- Lock-out barring device
- Pin It
- Lock and tag Out Flywheel
The volume remaining above the piston when it’s at TDC is called?
Clearance Volume
(CV)
The action of one body to another, tending to change the state of motion of the body acted upon, is?
Force
the twisting force acting at a radius that produces a turning moment is?
Torque
The rate at which work is being done?
Power
The power required to overcome engine frictional and pumping loses?
Friction Horse
(FHP)
What is the theoretical power of an engine?
Indicated Horsepower
(IHP)
The actual power measured at the end of the crankshaft?
Brake Horsepower
(BHP)
The resistance to motion between two surfaces?
Friction
The tendency of an object in motion to stay in motion?
Inertia
The pressure that is below atmospheric pressure?
Vacuum
The movement of the piston from (TDC to BDC) Top Dead Centre to Bottom Dead Centre?
Stroke
What is the inside of a round cylinder or hole?
Bore
An engine that has the same dimensions for bore diameter and stroke length is known as?
Square Engine
An engine that has a larger bore diameter than the stroke length?
Oversquare Engine
An Engine that has a larger stroke than the bore diameter is?
Undersquare Engine
Which type of engine has a higher piston speed?
Undersquare Engine
The volume swept by all pistons in the is?
The Engine Displacement
The ratio of the total volume of the cylinder (displacement) and the combustion chamber (clearance volume) when the piston is at BDC to the clearance volume when the piston is at TDC?
Compression Ratio
Compression ratio formula?
CR= (Displacement + Clearance) / Clearance Volume
The ratio expressed as a percent, of the volume of atmospheric air drawn into the cylinder on the intake stroke to the cylinder displacement?
Volumetric Efficiency
Volumetric efficiency usually applies to?
Four Stroke Engine
Most Engines have a thermal efficiency of?
25% to 35% Efficiency
Note: School says is 25% to 45% LOL
