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Block 8
| Question | Answer |
|---|---|
| Which allows free fluid flow in one direction and no fluid flow in the other direction? | Shuttle valve |
| Relief valves are used in hydraulic systems | as damage-preventing units. |
| The removal of air from an aircraft hydraulic system is generally accomplished | by operating the various hydraulic components through several cycles. |
| The component in the hydraulic system that is used to direct the flow of fluid is the | selector valve |
| If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening | may distort the flare. |
| The installation of a new metal hydraulic line should be made with | enough bends to allow the tube to expand and contract with temperature changes and v to absorb vibration |
| Which characteristics apply to aircraft hydraulic systems? 1. Minimum maintenance requirements. 2. Lightweight. 3. About 80 percent operating efficiency (20 percent loss due to fluid friction). 4. Simple to inspect. | 1,2,4 |
| What is one advantage of piston-type hydraulic motors over electric motors? | There is ho fire hazard if the motor is stalied. |
| Exhaust shroud heaters are most commonly found on... | single-engine aircraft |
| Air that has been passed between a sheet metal shroud and the engine exhaust muffler, to provide cabin heat, is a characteristic of what type of heater? | Exhaust Shroud Heater |
| Air that has been passed between a combustion chamber and stainless steel outer cylinder, to provide cabin heat, is a characteristic of what type of heater? | Combustion Heater |
| The duct limit switch is made up of____________ separate switches. | Three |
| In a combustion heating system, this type of switch cycles the heater when the desired cabin temperature is met. | cycling switch |
| In a combustion heating system, this type of switch cycles the heater when the heater reaches a high temperature. (Not an over-temperature condition) | cycling switch |
| Aircraft heaters should be inspected and serviced in reference to the... | Manufacture's Maintenance Manual |
| A small amount of carbon monoxide, over an extended period of time, will reduce the crew's ability to operate the aircraft. | True |
| What is the purpose of a pressure relief valve. | limit the amount of pressure preventing failure of components |
| The cabin pressure of an aircraft in flight is maintained at the selected altitude by... | controlling the rate at which air leaves the cabin |
| How much pressure will be needed to produce a force of 2,000 pounds if the piston has an area of 2.5 square inches? | 800 psi |
| During a routine contamination check, hydraulic fluid that appears to be visibly clean is good/usable fluid. | False |
| What type of valve in an aircraft hydraulic system permits fluid to flow freely in one direction, but restricts the rate at which fluid is allowed to flow in the other direction? * | orifice check valve |
| What test is used to determine the serviceability of an oxygen cylinder? | pressure test with water |
| How is the cabin pressure of a pressurized aircraft usually controlled? | By a pressure-sensitive valve that controls the output pressure of the pressurization pump. |
| Pascal's Law states that pressure applied to any part of a confined liquid is transmitted with undiminished intensity to every other part. | True |
| What is the main purpose of a pressurized reservoir in a hydraulic system? | Prevent hydraulic pump cavitation. |
| The spherical-type accumulator is constructed in______________ halves that are fastened, threaded, or welded together. | Two |
| The primary purpose of a hydraulic actuating unit is to transform. | fluid pressure into useful work |
| Characteristics of MIL-H-7644 hydraulic fluid are * | blue color, vegetable base, will burn, natural rubber |
| The priority valve gives priority to the non-critical hydraulic subsystems over critical systems when system pressure is low. | False |
| In addiction to viscosity, what are three important characteristics of hydraulic fluids that manufactures take into account? | fire point, flash point, and chemical stability |
| What are the two general types of contamination found within hydraulic systems? | abrasives and nonabriasives |
| Skydrol@ is ______ dyed color? * | Purple |
| The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is | exhausted or dumped, usually overboard. |
| When the cabin is pressurized in ___________ mode, the pressurization system maintains the cabin altitude at a single pressure. * | isobaric |
| Commercial aircraft fly between 30,000 and 40,000 feet depending on weight. | True |
| The cabin pressure of an aircraft in flight is maintained at the selected altitude by... | controlling the rate at which air leaves the cabin |
| The standard pressure of the atmosphere, at sea level is___________ * | 14.7 PSI |
| The lack of oxygen and its affects on the human body is called___________? | hypoxia |
| What are the three typical sources of air used to pressurize reciprocating aircraft? | engine-driven compressor, turbocharges, and superchargers |
| On some cabin pressurization systems, pressurization on the ground is restricted by the | main landing gear operated switch. |
| Oxygen bottles are labeled with the words "Aviators Breathing Oxygen" and regulated by the__________ * | DOT |
| Oxygen lines are color coded_________ * | green and white |
| An 02 (oxygen) cylinder should should never be completely emptied and considered empty between___________ psi. | 50 and 100 |
| The difference between the air pressure inside the aircraft's cabin and the air pressure outside the cabin is called | cabin differential pressure |
| An aircraft pressurization cycle is considered to be four complete series of events of operations that recur regularly. | False |
| The purpose of the dump valve is a pressurized aircraft is to relieve.. | all positive pressure form the cabin |
| What test is used to determine the serviceability of an oxygen cylinder? | pressure test with water |
| The altitude controller maintains cabin altitude by modulation of the | outflow valve |
| What type of oxygen system uses the rebreather bag-type mask? | Continuous flow |
| How is the cabin pressure of a pressurized aircraft usually controlled? | By an automatic outflow valve that dumps all the pressure in excess of the amount for which it is set. |
| Although aviation oxygen is similar to commercially processed oxygen, aviation oxygen is processed further to removed minute traces of nitrogen. | False |
| What is the purpose of a pressure relief valve. | limit the amount of pressure preventing failure of components |
| The cabin pressure of an aircraft in flight is maintained at the selected altitude by... | controlling the rate at which air leaves the cabin |
Created by:
Okenis