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Block 15
| Question | Answer |
|---|---|
| Stochiometric Mixtures | 15:1. The perfect mixture for combustion of fuel |
| Best power mixture | Mixture ratio 0.080 |
| Downdraft | Carburetor in which air passes downward |
| All float type Carburetors are | Updraft |
| The higher air is in the engine | The leaner the mixture |
| The lower the air gets | The richer the mixture |
| Lean mixture causes what | Loss of power and loss of fuel |
| The richer the mixture? | Loss of power and serious overheating |
| What causes detonation | Lean Mixture |
| 15:1 is? | 0.067 |
| What does 1 represent in the mixture of the carburetor | Fuel |
| What is a Venturi used for? | It is used in the throat of the carburetor to measure the air flow. |
| Mixture control system | Determines the ratio of the fuel to air mixture . |
| Which method of lubrication is not suitable of use in an aviation aircraft | Gravity |
| Which component in an oil lubrication system is used to aid in accelerating the warming up of engine oil | Tank hopper |
| Which of the following lubrication systems utilizes an external oil tank? | Dry sump tank |
| What does the designation “w” after the oil grade represent? | Winter Use |
| The temperature at which an oil’s wax content, normally held in solution , begins to solidify and separate into tiny crystals . | Cloud point |
| Which of the following is not a function of engine lubricating oil | Inflate |
| What type of friction is associated with gear type pump? | Wiping friction |
| Mineral oil was augmented with the introduction of what additives which were used as stabilizing agents that were quickly replaced because of buildup? | Metallic salts |
| In general a lubricating oil system must have a tank with a capacity how much greater than the system oil demand ? | 10% |
| The three criteria for selecting a suitable oil take into account high operating temperature, high bearing and what ? | Large clearance |
| Which oil type is still utilized during break in or wear in periods for a new or overhauled engine ? | Mineral based |
| Which of these is not an advantage to using the pressure lubrication method? | Pump back suction mitigation |
| Which type of oil is especially not recommended for use in aircraft reciprocating engines during the break in period? | Synthetic oils |
| Which class of lubrication system would have an integral means of storing the oil used in the engine . | Wet sump system |
| The Saybolt Universal Viscosimeter is used to establish the designation numbers for which scale? | Commercial grades |
| The point at which a liquid will begin to give off ignitable Vapors is known as what? | Flash point |
| The primary purpose of a lubricant is to reduce friction . | True |
| The measure of the change in viscosity of oil with a given change in temperature range is | Viscosity index |
| Which of the following uses the wet sump as it’s sources of oil? | Splash Method |
| The three methods of lubricating oil distribution through out the moving parts of an internal combustion engine are pressure feed_________, and combination | Splash |
| What is the device that controls the volume of the fuel/air mixture to the cylinders? | Throttle valve |
| What two factors make up the air metering force in a pressure carburetor . | Impact air and boost Venturi |
| What effect would the application of carburetor heat have on a fuel/air mixture during operation . | The mixture will become richer |
| What are the fuel metering forces of a conventional float type carburetor | Float chamber section Venturi suction |
| What is the function of a blast tube found on aircraft engines? | A device to cool an engine accessory. |
| The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to | force cooling air into close contact with all parts of the cylinders. |
| What is the purpose of an augmenter used in some reciprocating engine exhaust systems? | To aid in cooling the engine. |
| Increased engine heat will cause volumetric efficiency to: | Decrease. |
| What is the position of the cowl flaps during engine starting and warm-up operations under normal conditions? | Full open at all times. |
| Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of | cooling. |
| Which of the following should a mechanic consult to determine the maximum amount of cylinder cooling fin that could be removed when cracks are found? | Engine manufacturer's service or overhaul manual. |
| A bent cooling fin on an aluminum cylinder head | should be left alone if no crack has formed. |
| The undersides of pistons are frequently finned. The principal reason is to | provide for greater heat transfer to the engine oil |
| Which statement is true regarding the air passing through the combustion section of a jet engine? | Most is used for engine cooling. |
| Prolonged idling of an engine will usually result in | foreign material buildup on spark plugs. |
| Where are cooling fins usually located on air-cooled engines? | Cylinder head, cylinder barrel, and inside the piston. |
| How do cowl flaps aid in cooling a horizontally opposed aircraft engine? | Controls the amount of air flowing around the cylinders. |
| A broken cooling fin on a cylinder head | may be filed to smooth contours if damage and/or repair limits are not exceeded. |
| High cylinder head temperatures are likely to result from | a very lean mixture at high power set-tings. |
| Cylinder head temperatures are measured by means of an indicator and a | thermocouple sensing device. |
| Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly? | baffle and cowl arrangement. |
| During ground operation of an engine, the cowl flaps should be in what position? | Fully open. |
| An engine becomes overheated due to excessive taxing or improper ground run-up. Prior to shutdown, operation must continue until cylinders have cooled, by running engine at | idle RPM. |
| Reciprocating engines used in helicopters are cooled by | a fan mounted on the engine. |
Created by:
Okenis
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