When a magneto is operating, what is the probable cause for a shift in internal timing: the rotating magnet looses its magnetism the cam follower wear and/or the breaker points wear the distributor gear teeth are wearing on the rotor gear teeth.
What is the radial location of the two north poles of a four pole rotating magnet in a high tension magneto? 270 deegres apart 180 deegres apart 90 deegres apart.
What is the primary factor which controls the pressure ratio of an axial flow compressor?
Compressor inlet temperature. Number of stages in compressor. Compressor inlet pressure.
The fuel flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of:
fuel mass flow.
engine burner pressure drop. fuel volume flow.
The indication on a thermocouple-type cylinder head temperature indicator is produced by:
a current generated by the temperature difference between dissimilar metal hot and cold junctions. a difference in the voltage between two dissimilar metals. resistance changes in two dissimilar metals.
The amount of voltage generated in any magneto secondary coil is determined by the number of windings and by the:
rate of collapse of the magnetic field around the primary coil. amount of charge released by the capacitor. rate of buildup of the magnetic field around the primary coil.
ON-OFF two position engine electrical switches should be installed:
so the ON position is reached by a forward or upward motion. so that the toggle will move in the same direction as the desired motion of the unit controlled. under a guard.
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Why is expansion space required in an engine oil supply tank?
To eliminate oil foaming. For oil enlargement and collection of foam. For proper oil tank ventilation.
Which of the following will decrease volumetric efficiency in a reciprocating engine?
1. Full throttle operation.
2. Low cylinder head temperatures.
3. Improper valve timing.
4. Sharp bends in the induction system.
5. High carburetor air temperatures. 2, 4, and 5. 3, 4, and 5. 1, 2, 3, and 4.
What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?
Pistons and cylinder walls. Exhaust valves. Crankshaft main bearings.
Thermocouples are usually inserted or installed on the: hottest cylinder of the engine rear cylinder of the engine front cylinder of the engine.
On which strokes are both valves on a four-stroke cycle reciprocating aircraft engine open? intake and compression exhaust and intake power and exhaust.
Which statement is correct concerning a thermocouple type temperature indicating instrument system? it is a balanced type, variable resistor circuit it usually contains a balancing circuit in the instrument case to prevent fluctuations of the system voltage from affecting the temperature reading it requires no external power source.
When does valve overlap occur in the operation of an aircraft reciprocating engine? at the end of the compression stroke and the beginning of the power stroke at the end of the power stroke and the beginning of the exhaust stroke at the end of the exhaust stroke and the beginning of the intake stroke.
The purpose of the diaphragm in most vane type fuel pumps is to: maintain fuel pressure below atmospheric pressure compensate fuel pressures to altitudes changes equalize fuel pressure at all speeds.
What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods? the oil becomes diluted with gasoline washing past the pistons into the crankcase the oil becomes contamined with moisture, acids, and finely divided suspended solid particles exposure to heat and oxygen causes a decreased ability to maintain a film under load.
Bonding jumpers should be designed and installed in such a manner that they: prevent buildup of a static electrical charge between the airframe and the surrounding atmosphere are not subjected to flexing by relative motion of airframe or engine components provide a low electrical resistance in the ground circuit.
During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water mixed degreasers primarily because:
water-mixed degreaser residues may cause engine oil contamination in the overhauled engine. water-mixed degreasers cause corrosion. solvent degreasers are much more effective.
Compressor field cleaning on turbine engines is performed primarily in order to:
facilitate flight line inspection of engine inlet and compressor areas for defects or FOD. prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces. prevent engine oil contamination and subsequent engine bearing wear or damage.
At what RPM is a reciprocating engine ignition switch check made?
1,500 RPM. The slowest possible RPM. Full throttle RPM.
A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and:
adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation. develops the commands to various actuators to control engine parameters. controls engine operation according to ambient temperature, pressure, and humidity.
(1) Powerplant instrument range markings show whether the current state of powerplant operation is normal, acceptable for a limited time, or unauthorized.
(2) Powerplant instrument range markings are based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet.
Regarding the above statements, both No. 1 and No. 2 are true. only No. 1 is true. neither No. 1 nor No. 2 is true.
How often should float carburetors be overhauled?
At engine overhaul. At engine change. Annually.
The purpose of a safety gap in a magneto is to:
prevent burning of contact points. prevent burning out the primary winding. protect the high voltage winding from damage.
A purpose of the shrouds on the turbine blades of an axial flow engine is to:
reduce vibration. increase tip speed. reduce air entrance.
Which of the following is a characteristic of a thrust bearing used in most radial engines?
Double row ball. Deep groove ball. Tapered roller.
(1) Generally, when a turbine engine indicates high EGT for a particular EPR (when there is no significant damage), it means that the engine is out of trim.
(2) Some turbine powered aircraft use RPM as the primary indicator of thrust produced, others use EPR as the primary indicator.
Regarding the above statements, only No. 1 is true. both No. 1 and No. 2 are true. only No. 2 is true.
Propeller aerodynamic (thrust) imbalance can be largely eliminated by:
keeping the propeller blades within the same plane of rotation. static balancing. correct blade contouring and angle setting.
The desired engine idle speed and mixture setting:
is usually adjusted in the following sequence; speed first, then mixture. should give minimum RPM with maximum manifold pressure. is adjusted with engine warmed up and operating.
Which two elements make up the axial flow compressor assembly?
Stator and diffuser. Rotor and stator. Compressor and manifold.
The economizer system in a float type carburetor:
increases the fuel/air ratio at high power settings. functions only at cruise and idle speeds. keeps the fuel/air ratio constant.
The application of carburetor heat will have which of the following effects?
The mixture will become richer. The mixture will become leaner. The manifold pressure will be increased.
What is the function of a blast tube as found on aircraft engines? a device to cool an engine accessory a tube used to load a cartridge starter a means of cooling the engine by utilizing the propeller backwash.
(Refer to powerplant figure 2.) Determine the fire extinguisher container pressure limits when the temperature is 75 F. 326 minimum and 415 maximum 338 minimum and 424 maximum 330 minimum and 419 maximum.
Which condition would be the least likely to be caused by failed or failing engine bearings? high oil temperatures excessive oil consumption low oil temperatures.
(1) Cast iron piston rings may be used in chrome plated cylinders.
(2) Chrome plated rings may be used in plain steel cylinders.
Regarding the above statements, both no. 1 and no. 2 are true neither no. 1 nor no. 2 is true only no. 1 is true.
What is the relationship between distributor and crankshaft speed of aircraft reciprocating engines? the distributor turns at one and one half crankshaft speed the distributor turns at one half crankshaft speed the crankshaft turns at one half distributor speed.
Engine crankshaft runout is usually checked:
1. during engine overhaul
2. during annual inspection
3. after a 'prop strike' or sudden engine stoppage
4. during 100-hour inspection 1, 2, and 3 1 and 3 1, 3, and 4.
Why is high nickel chromium steel used in many exhaust systems? corrosion resistance and low expansion coefficient high heat conductivity and flexibility corrosion resistance and high heat conductivity.
What carburetor component measures the amount of air delivered to the engine? automatic mixture control venturi economizer valve.
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