How are most radial engine spark plug wires connected to the distributor block? by use of terminal sleeves and retaining nuts by use of self locking cable ferrules by use of cable piercing screws.
The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is: carried out with the exhaust gases converted into useful power dissipated through the cylinder walls and heads.
During overhaul, reciprocating engine exhaust valves are checked for stretch: by placing a valve on a surface plate and measuring its length with a vernier height gauge with a suitable inside spring caliper with a contour or radius gauge.
A red triangle, dot, or diamond mark on an engine instrument face or glass indicates: the maximum operating limit for all normal operations the maximum limit for transients such as starting a restricted operating range.
Where is the throttle valve located on a float type carburetor? between the venturi and the discharge nozzle after the venturi and just before the main discharge nozzle after the main discharge nozzle and venturi.
Indentations on bearing races caused by high static loads are known as: brinelling fretting galling.
Oil leakage around the rear cone of a hydromatic propeller usually indicates a defective: piston gasket dome barrel oil seal spider shaft oil seal.
Why do helicopters require a minimum of two synchronous tachometer systems?
One indicates engine RPM and the other tail rotor RPM. One indicates engine RPM and the other main rotor RPM. One indicates main rotor RPM and the other tail rotor RPM.
Boost manifold pressure is generally considered to be any manifold pressure above:
50 inches Hg. 14.7 inches Hg. 30 inches Hg.
What is the difference between a low tension and a high tension engine ignition system?
A low tension system uses a transformer coil near the spark plugs to boost voltage, while the high tension system voltage is constant from the magneto to the spark plugs. A high tension system is designed for high altitude aircraft, while a low tension system is for low to medium altitude aircraft. A low tension system produces relatively low voltage at the spark plug as compared to a high tension system.
If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects, they:
are in an acceptable service condition. must be degaussed before use. cannot be used again.
Engines using cold stream, or both cold and hot stream reversing include:
turbojets. turbojets with afterburner. high bypass turbofans.
Main bearing oil seals used with turbine engines are usually what type(s)?
Labyrinth and/or silicone rubber. Labyrinth and/or carbon rubbing. Teflon and synthetic rubber.
On an engine equipped with a pressure type carburetor, fuel supply in the idling range is ensured by the inclusion in the carburetor of:
an idle metering jet that bypasses the carburetor in the idle range. a separate boost venturi that is sensitive to the reduced airflow at start and idle speeds. a spring in the unmetered fuel chamber to supplement the action of normal metering forces.
(1) During takeoff, propeller thrust (pull) is greatest if the blade angle of attack is low and the engine power setting is high.
(2) With the aircraft stationary, propeller thrust is greatest if the blade angle of attack is high and the engine power setting is high.
Regarding the above statements, both No. 1 and No. 2 are true. only No. 2 is true. only No. 1 is true.
The highest heat to metal contact in a jet engine is the:
burner cans. turbine inlet guide vanes. turbine blades.
What is the purpose of the last chance oil filters?
To filter the oil immediately before it enters the main bearings. To assure a clean supply of oil to the lubrication system. To prevent damage to the oil spray nozzle.
When installing a magneto on an engine, the:
piston in the No. 1 cylinder must be a prescribed number of degrees after top center on the intake stroke. magneto breaker points must be just closing. piston in the No. 1 cylinder must be a prescribed number of degrees before top center on the compression stroke.
Which statement is true regarding bearings used in high powered reciprocating aircraft engines? There is less rolling friction when ball bearings are used than when roller bearings are employed. Crankshaft bearings are generally of the ball-type due to their ability to withstand extreme loads without overheating. The outer race of a single row, self aligning ball bearing will always have a radius equal to the radius of the balls.
High cylinder head temperatures are likely to result from:
a very rich mixture at high power settings. fouled spark plugs. a very lean mixture at high power settings.
Which of the following forces or combination of forces operates to move the blades of a constant speed counterweight type propeller to the HIGH PITCH position?
Prop governor oil pressure acting on the propeller piston cylinder arrangement. Engine oil pressure acting on the propeller piston cylinder arrangement and centrifugal force acting on the counterweights. Centrifugal force acting on the counterweights.
When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position,
the secondary circuits of both magnetos are opened. the primary circuits of both magnetos are grounded. all circuits are automatically opened.
A turbine engine hot section is particularly susceptible to which kind of damage?
Cracking. Galling. Scoring.
A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is:
valve overlap. hydraulic lock. zero valve clearance.
Excessive valve clearance results in the valves opening:
early and closing late. late and closing late. late and closing early.
In a turbine engine dc capacitor discharge ignition system, where are the high voltage pulses formed?
At the triggering transformer. At the breaker. At the rectifier.
What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?
Air/moisture separators, and ``washing'' the air clean utilizing water droplets. Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens. Positive and negative charged areas to attract and/or repel particulates out of the airflow.
What is the purpose of an engine-driven fuel pump bypass valve?
To divert the excess fuel from the pressure side of the pump to the inlet side of the pump. To divert the excess fuel back to the main tank. To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.
What is one purpose of the stator blades in the compressor section of a turbine engine?
Stabilize the pressure of the airflow. Increase the velocity of the airflow. Control the direction of the airflow.
The position of the cowl flaps during normal cruise flight conditions is:
one half open. closed. open.
When internally timing a magneto, the breaker points begin to open when:
the magnet poles are fully aligned with the pole shoes. the magnet poles are a few degrees beyond the neutral position. the piston has just passed TDC at the end of the compression stroke.
In the dual axial flow or twin spool compressor system, the first stage turbine drives the:
N2 compressor. N1 compressor. N1 and N2 compressors.
A propeller synchrophasing system allows a pilot to reduce noise and vibration by:
adjusting the phase angle between the propellers on an aircraft's engines. adjusting the plane of rotation of all propellers. setting the pitch angle of all propellers exactly the same.
Which of the following statements regarding magneto switch circuits is NOT true?
In the RIGHT position, the right magneto circuit is open and the left magneto circuit is grounded. In the BOTH position, the right and left magneto circuits are grounded. In the OFF position, neither the right nor left magneto circuits are open.
Reciprocating engine exhaust system designs commonly used to provide for ease of installation and/or allow for expansion and contraction, may include the use of:
1. spring loaded ball/flexible joints.
2. slip joints.
3. bellows.
4. flexible metal tubing. 1, 2, and/or 3. 1, 2, 3, and/or 4. 1, 2, and/or 4.
Which statement is correct regarding engine crankshafts?
Moveable counterweights are designed to resonate at the natural frequency of the crankshaft. Moveable counterweights serve to reduce the dynamic vibrations in an aircraft reciprocating engine. Moveable counterweights serve to reduce the torsional vibrations in an aircraft reciprocating engine.
How is the strength of a magneto magnet checked?
Check the ac voltage reading at the breaker points. Hold the points open and check the output of the primary coil with an ac ammeter while operating the magneto at a specified speed. Check the output of the secondary coil with an ac ammeter while operating the magneto at a specified speed.
Which of the following bearing types must be continuously lubricated by pressure oil?
Ball. Roller. Plain.
How is a propeller controlled in a large aircraft with a turboprop installation?
Independently of the engine. By the engine power lever. By varying the engine RPM except for feathering and reversing.
When selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor,
a switch designed for dc should be chosen. only switches with screw type terminal connections should be used. a derating factor should be applied.
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