Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Peters Midterm
| Question | Answer |
|---|---|
| The capacity for doing work is called? | Energy |
| Boyle's Law states that the volume of any dry gas varies _____ with the absolute pressure sustained by it, the temperature remaining _______ | inversely, constant |
| Charles' Law states that the presser of a confined gas is directly proportional to its _____ | absolute temp. |
| An engine ____ is the series of events that an internal-combustion engine goes through while operating and delivering power. | cycle |
| In a four-stroke five-event cycle, these events are: | intake, compression, ignition, combustion and exhaust |
| The four-stroke five-event cycle is called _____ cycle | Otto |
| The basic power-developing parts of a typical gasoline engine are the: | cylinder, piston, connecting rod, and crankshaft |
| The distance through which the piston travels is called the ____ | stroke |
| During each stroke, the crankshaft rotates ______ degrees | 180 |
| ______ is the point which a piston has reached when it is at its maximum distance from the centerline of the crankshaft. | Top dead center |
| Is the ratio of the volume of space in the cylinder 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 |
| In a four-stroke-cycle engine, the crankshaft makes ____ r for each complete cycle. | 2 |
| Ignition is caused by a _____ which produces an electric spark in the fuel-air mixture. | spark plug |
| The ignition is timed to occur a few degrees ______ to allow time for complete combustion of the fuel. | before TDC |
| During the _____ stroke, both valves are closed, the piston moves toward TDC, compressing the fuel-air mixture and ignition takes place near the top of the stroke. | Compression |
| During the ____ stroke, the intake valve is open and the exhaust valve is closed, the piston moves downward, drawing the fuel-air mixture into the cylinder, and the intake valve closes | Intake |
| During the _____ stroke, the exhaust valve is open and the intake valve is closed, the piston moves toward the TDC, forcing the burned gases out through the open exhaust valve, and the intake valve opens near the top of the stroke. | Exhaust |
| During the ____ stroke, both valves are closed, the pressure of the expanding gases forces the piston toward BDC, and the exhaust valve opens well before the bottom of the stroke. | Power |
| The angular distance through which both valves are open is called | valve overlap |
| The exhaust valve opens before BC for two principle reasons: more thorough _______ of the cylinder and better ______ of the engine. | scavenging, cooling |
| The opening or closing of the intake or exhaust valves after TC or BC is called | valve lag |
| The opening or closing of the intake or exhaust valves before TC and BC is called | valve lead |
| The order in which the engine cylinders fire is called the _____. | firing order |
| One horsepower equals ______ ft*lb/min. | 33,000 |
| The ______ of one piston is obtained by multiplying the area of a cross section of the cylinder bore by the total distance that the piston moves during one stroke in the cylinder. | piston displacement |
| The horsepower delivered by the engine, that is, the total horsepower converted from heat energy to mechanical energy is the ____ horsepower | indicated |
| The actual horsepower delivered by an engine to a propeller or other driven device is _____ horsepower | brake |
| The part of the total horsepower necessary to overcome the friction of the moving parts in the engine and its accessories is called _____ horsepower. | Friction |
| The pressure of the fuel-air mixture in the intake manifold between the carburetor or the internal supercharger and the intake valve is called the | manifold pressure |
| The maximum continuous power is also called the | Meto power |
| The greatest power output that the engine can develop at any time under any condition is called _____ power | maximum |
| The highest level at which an engine will maintain given horsepower output is the ____ altitude. | Critical |
| The measure of the heat losses suffered in converting the heat energy of the fuel to mechanical work is _____ efficiency. | thermal |
| The efficiency of an engine is the ratio of ______ to _____ | output, input |
| The ratio of the volume of the fuel-air charge burned by the engine at atmospheric pressure and temperature to the piston displacement is the _______ efficiency | volumetric |
| An unsupercharged engine always has a volumetric efficiency of less than ____ percent | 100 |
| Detonation will result whenever the _______ and _____ in the cylinder become excessive. | temperature, pressure |
| _____ is caused when there is a hot spot in the engine that ignites the fuel-air mixture before the spark plug fires. | Preignition |
| The number of pounds of fuel burned per hour for each bhp produced is the ______ | bsfc (brake specific fuel consumption) |
| The best _____ mixture for an aircraft engine is the fuel-air mixture which permits the engine to develop maximum power at a particular rpm. | power |
| The best ______ mixture is that fuel-air mixture which provides the lowest bfsc. | economy |
| Any natural or artificial substance having greasy or oily properties which can help reduce friction between moving parts or prevent rust or corrosion is called a | lubricant |
| _____ is the weight of any substance compared with the weight of an equal volume of a standard substance. | Specific gravity |
| The temperature at which oil must must be heated in order to give off enough vaper to form combustible mixture above the surface that will momentarily flash or burn when the vapor is brought into a small flame is called the | Flash point |
| The fluid friction (or the body) of a liquid is called the _____ | viscosity |
| The viscosity ____ is an arbitrary measure of the rate of change in the viscosity of an oil with changes in temperature. | index |
| An aircraft engine oil must have _____ stability against oxidation , thermal cracking and coking. It must also have ____ stability with regard to pressure and temperature. | chemical, physical |
| When one surface sliding over another, the interlocking particles of metal on each surface offer resistance to motion known as ____ friction. | sliding |
| When a cylinder or sphere rolls over the surface of a plane object, the resistance to motion offered by the surfaces to each other is known as _____ friction | rolling |
| Most aircraft oils other than straight mineral oils contain a ______ that suspends contaminates such as carbon, lead compounds, and dirt. | dispersant |
| _____ oils react better to temperature changes than do ______ -grade oils. | multi-grade, single |
| The purpose of a _____ system is to supply oil to the engine at the correct pressure and volume to provide adequate lubrication and cooling for all parts of the engine which are subject to friction | lubrication |
| In a ____ lubrication system, a mechanical pump supplies oil under pressure to the bearings. | pressure |
| The oil temp. ______ is designed to maintain the temperature of the oi in an operating engine at the correct level. | regulator |
| The oil flow through the cooling portion of the oil temperature regulator is controlled by the oil cooler _____ valve | bypass |
| The purpose of an oil pressure ______ is to control and limit the lubricating system oil pressure. | relief valve |
| The purpose of an ______ is to remove solid particles of foreign matter from the oil before it enters the engine. | oil filter |
| A _____ oil filter is positioned between the oil pump and the engine bearings, filtering all the circulated oil of any contaminates before it passes through the bearing surface. | Full flow |
| During the inspection of the engine oil filter, the residue on the screens, disks, or disposable filter cartridge, are examined for _____ particles | metal |
| An oil _____ is usually placed in the discharge line from a vacuum pump or air pump and its function is to remove the oil from the discharged air | separator |
| The oil gage line, which is connected to the system near the outlet of the engine pressure pump is filled with, ____- viscosity oil in cold weather to obtain a true indication of the oil pressure during engine warm up. | low |
| A restricting _____ is placed in the oil gage line to retain the low-viscosity oil and to prevent damage from pressure surges. | orfice |
| Oil pressure pumps may be either the _____ type or the _____ type | gear, vane |
| The scavenge pump for a dry-sump lubrication system or turbocharger is designed with a capacity _____ than that of the pressure pump | greater |
| In a _____ -sump engine, the lubricating oil for the engine is stored in the sump, which is attached to the lower side of the engine. | Wet |
| In a ____- sump system, the oil is pumped out of the engine into the external oil tank. | Dry |
Created by:
Tiana Arch