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Small engines
Small Engines Test 2
| Question | Answer |
|---|---|
| What is a carburetor? | A device for automatically mixing fuel in proper proportion with air to produce a combustible gas. |
| What is an air fuel ratio? | Ratio, by weight, of fuel as compared to air in carburetor mixture. |
| What is a venture? | Two tapering streamlined tubes joined at their small ends so as to reduce the internal diameter. |
| What is atmospheric pressure? | The weight of air at sea level (about 14.7 psi). |
| What is a vacuum? | A perfect vacuum has not been created as this would involve an absolute lack of pressure. The term is ordinarily used to describe a partial vacuum, that is, pressure less than atmospheric pressure. |
| What is a air bleed? | A tube in a carburetor through which air can pass into fuel moving through a fuel passage. |
| What is an up draft? | Used to describe a carburetor through which air can pass into fuel moving through a fuel passage. |
| What is an down draft? | Used to describe a carburetor type where the mixture flows downward to the engine. |
| What is an air cleaner? | A device for filtering, cleaning, and removing dust from the air admitted to an engine. |
| What is an air horn? | Part of air passage in carburetor that is on the atmospheric side of the venture. |
| What is a choke? | A reduced passage, such as a valve placed in a carburetor air inlet to restrict the volume of air admitted. |
| What is a float? | A hollow tank that is lighter than the fluid which it rests. A float is ordinarily used to automatically operate a valve controlling the entrance of a fluid. |
| What is a float level? | The predetermined height of the fuel in the carburetor bowl usually regulated by means of a suitable valve. |
| What is a linkage? | Any series of rods, yokes, and levers, etc, used to transmit motion from one unit to another. |
| What is an idle? | Refers to the engine operating at its slowest practical speed. |
| What is an intake manifold? | The tube used to conduct the gasoline and air mixture from the carburetor to the engine cylinders. |
| What are the types of engine fuels? | Gasoline, liquefied petroleum gas, natural gas, kerosene, and diesel fuel. |
| What are fuel tanks made out of? | Metal or plastic. |
| Where are fuel tanks located? | Mounted away from the engine or are contoured to fit snugly around the engine. |
| What are filler caps? | They prevent evaporation when the vent is closed, are baffled to prevent dirt and dust from entering fuel tank. |
| What is fuel lines made out of? | Rubber, steel, or plastic. |
| What is the primary purpose of the carburetor? | Produce a mixture of fuel and air to operate the engine. |
| What are the 5 conditions of operation. | Cold or hot starting, idling, part throttle, acceleration, and high speed operation. |
| What is the venture principle? | Purpose of drawing fuel into the air stream. |
| What is the function of the float system? | Maintains a constant level of fuel in the float bowl. |
| What are the 3 components of the float system? | Needle valve, float, and bowl. |
| What is the float bowl vent? | Air pressure above the fuel in the bowl and the air pressure entering the carburetor are equalized by the vent. The vent assures a continuous, free flow of fuel/ |
| What is the function of the choke system? | When closed, the choke provides a rich air fuel mixture, necessary when starting a cold engine. |
| What is the function of the throttle system? | Regulates the amount of air fuel mixture entering the cylinders. Permits the operator to vary engine speed to maintain a uniform speed when the load varies. |
| What is the idle circuit operation? | Supplies just enough air to keep the engine running. |
| What are the three functions of the governor? | Maintain a speed selected by operator that is within range of governor. Prevent over speeding that may cause engine damage. Limit both high and low speeds. |
| What is the governor operation? | Maintains speed by a throttle lever. |
| What is the springs function? | Designed to pull the throttle valve to wide open position. |
| What is the function of the air filter? | Prevents dirt / grit from entering the cylinder. |
| What are the three types of air filters? | Oil wetted, dry types, and dual element. |
| What is the air filter service? | Cleaning every twenty five hours of operating time is recommended, or once a season, in dustier conditions cleaning should be done more often. |
| On an air vane governor, controlling speed is accomplished by balancing ___ pressure with ___ ___? | Air, spring tension. |
| What are three types of air cleaners? | Paper, foam, and oil wetted. |
| Which type of air cleaner element can be used again by washing it in cleaning solvent? | Oil wetted. |
| What does fuel consist of? | Air and gasoline. |
| What is a primer? | Rubber bulb that squirts extra gasoline for starting. |
| The economizer circuit is designed to retard fuel flow to the engine at what? | Part throttle. |
| The primer on a float type carburetor pumps what? | Air pressure into the float bowl forcing fuel up the nozzle. |
| Diaphram carburetoe are operated by the ___ ___. | Atmospheric pressure. |
| A carburetors primary function is to mix proportions of ___ and ___ to operate the engine? | Air and fuel. |
| Gasoline must be ___ by the carburetor? | Atomized. |
| The usual normal air fuel mixture is a ratio of ___ parts of air to ___ parts of fuel. | 15 to 1. |
| An absolute___ is any area completely free of air or atmospheric pressure. | Vacuum. |
| As soon as the intake valve opens or the intake port is uncovered in a gas engine, ___ ___ forces air through the carburetor and manifold to fill that vacuum. | Atmospheric pressure. |
| Excessive oil in a two cycle engine fuel mixture can result in ___. | The rapid burning of gases, incomplete combustion, and fouling of the spark plugs. |
| Fuel tanks must be vented to ___ in the tank. | Prevent a vacuum. |
| A filler cap with a screw vent should be closed___. | At all times. |
Created by:
sheeba1cindy