Download ASA POWERPLANT ORAL EXAM | ALL QUESTIONS AND CORRECT ANSWERS | GRADED A+ | VERIFIED ANS and more Exams Industrial Engineering in PDF only on Docsity!
ASA POWERPLANT ORAL EXAM | ALL
QUESTIONS AND CORRECT ANSWERS |
GRADED A+ | VERIFIED ANSWERS | LATEST
VERSION | STUDY THIS ONE!
What is checked when a Magneto is internally time? ------CORRECT ANSWER---------------Internally timing a Magneto consists of adjusting the breaker points so that they will open at the instant the rotating magnet is in the E Gap position, and the distributor rotor is in a position to direct the high-voltage to cylinder number one. And what position should the ignition switch be placed when using a timing light on the Magneto's? ------CORRECT ANSWER---------------In the both position. What type of ignition system is used on most turbine engines? ------ CORRECT ANSWER---------------High-intensity, intermittent Duty, capacitor discharge ignition systems. What is the E Gap in the Magneto timing? ------CORRECT ANSWER--------- ------The E Gap angle is in the position of the rotating magnet when the primary current flowing through the Magneto coil is in the greatest. The breaker points open when the rotating magnet is in the e-gap position. What is the function of an Impulse coupling? ------CORRECT ANSWER----- ----------An Impulse coupling is a spring driven coupling between the Magneto and the engine. When the engine is being started, the impulse coupling holds the rotating magnet until the Piston passes over it stops
interposition and starts down. The impulse coupling releases the magnet and a spring spins it fast so that it can produce a hot and late spark. How many igniters are used on most turbine engines? ------CORRECT ANSWER---------------2. What are two types of ignition systems used on turbine engines? ------ CORRECT ANSWER---------------High voltage systems and low voltage systems. With which type of turbine engine ignition system is a glow plug igniter used? ------CORRECT ANSWER---------------A low-voltage system. How is the strength of the magnet in a Magneto checked? ------CORRECT ANSWER---------------The Magneto is put on a test and rotated at a specific speed. The breaker points are held open and the primary circuit is measured. The strength of the magnet determines the amount of primary current. In what position is the magnet in a Magneto, when the greatest change in flux density in the coil core takes place? ------CORRECT ANSWER----------- ----A few degrees be on its neutral position. When it is in this position, the breaker points open and the primary current is interrupted. The flux change and the coil core is the greatest. In what position is the magnet in a Magneto when the breaker points begin to open? ------CORRECT ANSWER---------------In it's e gap position, just a few degrees Beyond its neutral position.
plug. The open firing and allows the gases that contain led to be purged from the spark plug that so that they will not form solid lead contaminants. Why is it important that the spark plugs be kept in numbered holes in a tray when they are removed from an engine? ------CORRECT ANSWER---------- -----Spark plugs till a good deal about the internal condition of the cylinders from which they were taken by knowing the cylinder from which each spark plug came, the mechanic can take the proper action when they spark plug indicates such conditions as detonation or overheating. Why is it important that a torque wrench always be used when installing spark plugs in an aircraft engine? ------CORRECT ANSWER---------------If the spark plugs are not put in tight enough, there is a possibility of a poor seal; if they are put into tight, there is a danger of cracking the insulation. What kind of gauge should be used to measure the electrode Gap in aircraft spark plugs? ------CORRECT ANSWER---------------A round wire gauge. What kind of electric starting system is used on many of the smaller turbine engines? ------CORRECT ANSWER---------------A starter generator. What happens when the start switch for a turbine engine with a starter generator is place to the start position? ------CORRECT ANSWER------------ ---Current flows into the starter relay which closes and actuates the ignition Exciter. Current flows through the series motor coils of the starter generator and rotates the engine until it starts.
What happens when the start switch for a turbine engine with a starter generator is placed in the Run position? ------CORRECT ANSWER----------- ----The starter relay opens, shutting off current to the ignition Exciter and the motor windings and the starter generator. The generator fuel relay is closed connecting the voltage regulator to the starter generator. The output of the generator flows to the bus through the generator circuit breaker. What is indicated if the starter relay Chatters rather than locks and, when the start switch is placed in the start position? ------CORRECT ANSWER---- -----------The battery voltage is too low to supply enough current to hold the relay engaged. Why are air turbine starters superior too electric starters for large turbine engines? ------CORRECT ANSWER---------------They are lightweight for the torque they produce. Where does the air turbine starter gets its air for starting the engines on a jet transport airplane? ------CORRECT ANSWER---------------From an APU, GPU, or from a running engine. What is the purpose of the shear section in an air turbine drive shaft? ------ CORRECT ANSWER---------------If the ratchet mechanism fails to release and the engine drives the starter to a speed higher than its design speed, the shear section will break and disconnect the starter from the engine. What prevents too high and air pressure from over-speeding an air turbine starter? ------CORRECT ANSWER---------------The air shut off and regulating valve.
Does a turbine engine controlled by a FADEC require manual trimming? --- ---CORRECT ANSWER---------------No, this is done by the FADEC. When should a turbine engine be retrimmed? ------CORRECT ANSWER---- -----------Anytime there is a decrease in engine thrust, and after any maintenance that the manufacturer specifies as requiring retrimming. Are the instruments installed in an aircraft suitable for use when trimming a turbine engine? ------CORRECT ANSWER---------------No, a special analyzer trimmer such as a Jet Cal should be used. What specifications are used to trim a turbine engine? ------CORRECT ANSWER---------------The data play specifications for the specific engine. This data was obtained when the engine was calibrated in the manufacturers test cell. Where should ambient temperature be measured when trimming a turbine engine? ------CORRECT ANSWER---------------In a shaded area as near to the engine inlet as is practical. In what position should the crankshaft be when a magneto is being timed to the engine? ------CORRECT ANSWER---------------The piston in cylinder no.1 should be in the correct position for ignition to occur. This is normally about 30 degrees before top center on the compression stroke. What is the purpose of a cold cylinder check? ------CORRECT ANSWER---- -----------A cold cylinder check determines which cylinder is not firing. Run
the engine for a few minutes at the speed, and on the magneto, at which it runs roughest. Shut it down and feel the exhaust stack near the cylinder head. The cylinder with the stack that is not as hot as the others is the cylinder that has not been firing. What is checked on engine run up to determine the operational condition of the engine? ------CORRECT ANSWER---------------Idling RPM and manifold pressure, engine acceleration, maximum static RPM and manifold pressure, magneto drop, ignition switch safety check, propeller pitch change, propeller feathering, oil pressure, fuel pressure, and fuel flow. How can you determine the firing order of an 18-cylinder radial engine? -----
- CORRECT ANSWER---------------Begin with cylinder 1, add 11 and subtract 7, whichever will keep the numbers between 1 and 18. 1- 12 - 5 - 16 - 9 - 2 - 13 - 6 - 17 - 10 - 3 - 14 - 7 - 18 - 11 - 4 - 15 - 8. What are two main causes of a cylinder having low compression? ------ CORRECT ANSWER---------------Piston rings not seating or broken, and valves not seating or burned. What is a hydraulic lock in an aircraft engine? ------CORRECT ANSWER---- -----------Oil has drained past the piston rings and filled the combustion chamber of cylinders that are below the center line of the engine. If the crankshaft is turned over with this oil in the cylinder it will lock, and there is a probability that the piston, cylinder, or connecting rod will be damaged. How is a hydraulic lock removed from an aircraft engine? ------CORRECT ANSWER---------------Remove a spark plug from the locked cylinder and drain all the oil out. Clean the spark plug and reinstall it.
What checks should be made to determine the proper operation of a reciprocating engine installation? ------CORRECT ANSWER---------------Idle RPM and mixture, static RPM, propeller pitch change operation, magneto check, ignition switch safety check, and carburetor heat check. Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine? ------CORRECT ANSWER--------------- In the Type Certificate Data Sheets (TCDS) for the aircraft. What are the basic steps in troubleshooting an engine installation? ------ CORRECT ANSWER---------------A. Know how the system should operate B. Observe how the system is operating. C. Divide the system to find the trouble. D. Look for the obvious problems first. Where do you find the procedures to follow when correcting a defective condition in an aircraft engine? ------CORRECT ANSWER---------------In the engine maintenance manual. Where do you find instructions for removing an engine from an aircraft? ---- --CORRECT ANSWER---------------In the aircraft maintenance manual. What must normally be done to a nose-wheel airplane before removing an engine? ------CORRECT ANSWER---------------The tail of the airplane must be supported.
What should be done to the cylinders to protect them from rust and corrosion when preparing the engine for long-time storage? ------ CORRECT ANSWER---------------Spray a preservative oil inside the cylinders and replace the spark plugs with desiccant plugs. What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine? ------CORRECT ANSWER---------------The correct plugs or caps. Never cover the end of a line with tape. What is meant by a QEC engine assembly? ------CORRECT ANSWER------ ---------An engine that has been prepared for a quick engine change. The engine is on its mount and all of the accessories are installed. A minimum of time is required to change engines. All that is needed is for the controls, wiring, and fluid lines to be connected to the firewall. What is meant by rigging the engine controls so they have some "cushion"? ------CORRECT ANSWER---------------The control on the engine component must contact its stop before the control handle in the cockpit reaches its stop. This causes the control handle to spring back a slight amount when it is moved to the extent of its travel. What are two ways of pre oiling an engine? ------CORRECT ANSWER------- --------A. before the spark plugs are installed and after the oil tank or sump is filled, turn the engine over with the starter until oil runs out of the fitting to which the oil pressure gage connects. B. Use a pre oiler tank. Air pressure forces oil through all of the passages until some of it flows from the oil pressure gage fitting.
Where can you find the model of magneto that is approved for an engine specified by the examiner? ------CORRECT ANSWER---------------T C D S for the engine. What is a Supplemental Type Certificate? ------CORRECT ANSWER--------- ------An approval issued by the FAA for a modification to a type-certificated airframe, engine, or component. What paperwork is necessary for the installation of a magneto that was not approved for an engine when it was certificated, but is approved for the engine when installed according to an STC? ------CORRECT ANSWER----- ----------A form FAA 337 must be completed stating that the installation was done in accordance with the specific STC. What are three types of flow-indicating systems used for turbine engine? --- ---CORRECT ANSWER---------------Vane-type flow meters, synchronous mass-type flow meters, and electronic motorless mass flow meters. What do mass flow systems measure? ------CORRECT ANSWER------------- --The mass of the flow. This is affected by the density of the fuel which is in turn affected by the fuel temperature. In what units is an electronic motorless mass flow meter system calibrated? ------CORRECT ANSWER---------------Pounds per hour of fuel flow. What is indicated in a turbine engine if the fuel flow for all conditions is high? ------CORRECT ANSWER---------------If there are other instrument abnormalities, there are possibly damaged turbine components.
Who is authorized to repair a fuel flow indicating system? ------CORRECT ANSWER---------------The components can be repaired only by an FAA approved repair station certificated for the particular instruments. Where can you find the electrical power requirements for a fuel flow indicating system? ------CORRECT ANSWER---------------In the aircraft maintenance manual. Where in the fuel system is the fuel flow transmitter located? ------ CORRECT ANSWER---------------Between the fuel control and the fuel nozzles. What kind of indicating system is used to measure oil temperature in a small, single engine, general aviation airplane? ------CORRECT ANSWER-- -------------A sealed system in which a bulb, partially filled with a highly volatile liquid, is installed inside the oil strainer. The bulb is connected to a pressure gage by a copper tube. The pressure of the gas above the liquid is proportional to the temperature of the oil that surrounds the bulb, and the pressure gage is calibrated in terms of temperature. What type of instrument system is used for measuring cylinder head temperature and exhaust gas temperature? ------CORRECT ANSWER------ ---------A thermocouple system. What kind of electrical instrument system is used for measuring oil temperature? ------CORRECT ANSWER---------------A ratiometer type system.
What kind of tachometer is used on most large multi-engine airplanes? -----
- CORRECT ANSWER---------------A three-phase AC electric tachometer. What is measured to indicate the engine RPM with a three-phase AC electric tachometer? ------CORRECT ANSWER---------------The frequency of the AC the tachometer generator produces. What kind of indicator mechanism is used to measure oil pressure? ------ CORRECT ANSWER---------------A Bourdon Tube. What kind of indicator mechanism is used to measure manifold pressure? - -----CORRECT ANSWER---------------A differential bellows. What should a manifold pressure gage read when the engine is not operating? ------CORRECT ANSWER---------------The existing barometric pressure as indicated on the altimeter barometric scale when the altimeter pointers are set to the surveyed field elevation. What type of fitting is used to connect an oil pressure gage to the engine? - -----CORRECT ANSWER---------------A fitting with a restrictor that smoothes out the pulsations and prevents a break in the indicator line, causing a serious loss of engine oil. What is used to fil the line between a fuel pressure gage and the fuel metering system? ------CORRECT ANSWER---------------A light oil such as kerosene.
What could cause a fuel pressure gage to fluctuate? ------CORRECT ANSWER---------------The loss of the light oil in the line between the gage and the engine. Is a certificated mechanic with an airframe and powerplant rating allowed to zero the pointers on a fuel pressure gage? ------CORRECT ANSWER-------- -------No, a mechanic is not allowed to make any repairs or alterations to an aircraft instrument. How does a ratiometer type oil temperature gage measure the temperature of the oil? ------CORRECT ANSWER---------------A ratiometer measures the resistance of the temperature bulb. The indicator is calibrated in degrees Fahrenheit or Celsius rather than in ohms. What is the range of pressure needed for a fuel pressure gage used with a float carburetor? ------CORRECT ANSWER---------------Normally from 1 to 25 psi. What are four types of engine fire detection systems? ------CORRECT ANSWER---------------Thermo switch system thermocouple system thermistor type continuous loop system pneumatic type continuous loop system. Which type of fire detection system operates on the principle of the rate of temperature rise? ------CORRECT ANSWER---------------The thermocouple system
continuous loop element, the controller, and the fire warning Bell and or light. What happens in a jet transport airplane when the fire Pulte handle for an engine is pulled? ------CORRECT ANSWER---------------The engine fuel shut off valve is closed. The generator field relay is tripped. The compressor bleed air valve is closed. The anti-ice valve is closed. The hydraulic supply shut off valve is closed. The hydraulic pump low pressure warning lights are turned off. What is used as a fire extinguishing agent in some older aircraft? ------ CORRECT ANSWER---------------Carbon dioxide. CO What fire extinguishing agent is used in the high rate discharge bottles installed in a jet Transport Aircraft? ------CORRECT ANSWER--------------- Halon 1211 or 1301. How is a high rate discharge bottle of fire extinguishing agent discharged? - -----CORRECT ANSWER---------------A powder charge is ignited and it blows a cutter through the frangible disc that seals the bottle. What precaution must be taken when checking the electrical circuit for igniting the powder charge in the valve of a high rate discharge bottle? ------ CORRECT ANSWER---------------The current use to check the Integrity of the electric circuit must not be high enough to ignite the powder charge.
What is indicated if the red discharge indicator for the fire extinguishing system is blown out? ------CORRECT ANSWER---------------The system has been discharged by an overheat condition. What is indicated if the yellow discharge indicator for a fire extinguishing system is blown out? ------CORRECT ANSWER---------------The system has been discharged by an actuating the bottle discharge switch. What color and marking is used to identify the fluid lines that carry the fire extinguishing agent in an aircraft? ------CORRECT ANSWER--------------- Brown tape with a series of diamonds on it. What is meant by pressure cooling of an air-cooled engine? ------ CORRECT ANSWER---------------Ram air on one side of the engine is forced by series of baffles to flow through this fins on the cylinders to a low pressure area on the other side of the engine. What must be inspected on the cooling system of an air-cooled engine? ---- --CORRECT ANSWER---------------All the baffles and air seals must be in place and in good condition. Why should an air-cooled engine not be run up to high power without the cowling installed? ------CORRECT ANSWER---------------The engine depends on the cowling to force air through the cylinder fins to remove the excess heat.
