What carburetor component actually limits the desired maximum airflow to the engine at full throttle?
Venturi. Manifold intake. Throttle valve.
What unit in a tachometer system sends information to the indicator?
The synchronous motor. The two phase ac generator. The three phase ac generator.
What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?
Cooling ability. Friction resistance. Chemical stability.
What is indicated when the front cone bottoms while installing a propeller?
Blade angles are incorrect. Propeller dome combination is incorrect. Rear cone should be moved forward.
(Refer to Figure 2 .) Determine the fire extinguisher container pressure limits when the temperature is 75 °F.
338 minimum and 424 maximum. 330 minimum and 419 maximum. 326 minimum and 415 maximum.
The pitch changing mechanism of the hydromatic propeller is lubricated by:
using an approved type grease in a grease gun at intervals prescribed by the propeller manufacturer. thoroughly greasing, necessary only during propeller overhaul. the pitch changing oil.
What is required by 14 CFR Part 43 Appendix D when performing an annual/ 100-hour inspection on a reciprocating engine aircraft?
Valve clearance check. Cylinder compression check. Magneto timing check.
What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?
Breakable disk and fusible disk. Pressure gauge and cartridge. Pressure switch and check tee valve.
(Refer to Figure 1 .) Determine which portion of the AD is applicable for Model O-690 series engine, serial No. 5863-40 with 283 hours' time in service.
(B), (2). (A). (B), (1).
If an engine cylinder is to be removed, at what position in the cylinder should the piston be?
Halfway between top and bottom dead center. Top dead center. Bottom dead center.
The hot section of a turbine engine is particularly susceptible to which of the following kind of damage? galling pitting cracking.
Which statement is true regarding proper throttle rigging of an airplane? the throttle control is properly adjusted when neither stop makes contact the stop in the cockpit must be contacted before the stop on the carburetor the throttle stop on the carburetor must be contacted before the stop in the cockpit.
When removing a shielded spark plug, which of the following is most likely to be damaged? shell section core insulator center electrode.
Grease used in aircraft propellers reduces the frictional resistance of moving parts and is easily molded into any form under pressure. This statement defines: antifriction and chemical stability of grease antifriction and plasticity characteristics of grease viscosity and melting point of grease.
Thermocouple leads: are designed for a specific installation and may not be altered may be repaired using solderless connectors may be installed with either lead to either post of the indicator.
What are the three basic regulating components of a sea level boosted turbocharger system?
1. exhaust bypass assembly
2. compressor assembly
3. pump and bearing casing
4. density controller
5. differential pressure controller 2, 3, 4 1, 2, 3 1, 4, 5.
(Refer to powerplant figure 1.) Determine which portion of the AD is applicable for model O-690 series engine, serial no. 5863-40 with 283 hours time in service. (a) (b), (1) (b), (2).
What type of nuts are used to hold an exhaust system to the cylinders?
Brass or heat-resistant nuts. High-temperature aluminum self-locking nuts. High-temperature fiber self-locking nuts.
Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by:
the design shape of the piston skirt. internal engine pressure bleeding past the ring grooves. oil control rings on the pistons.
Spark plug fouling caused by lead deposits occurs most often:
when cylinder head temperatures are high. during cruise with rich mixture. when cylinder head temperatures are relatively low.
Anti icing of jet engine air inlets is commonly accomplished by:
electrical heating elements inside the inlet guide vanes. engine bleed air ducted through the critical areas. electrical heating elements located within the engine air inlet cowling.
Which of the following are advantages of dual ignition in aircraft engines?
1. Gives a more complete and quick combustion of the fuel.
2. Provides a backup magneto system.
3. Increases the output power of the engine.
4. Permits the use of lower grade fuels.
5. Increases the intensity of the spark at the spark plugs. 2, 3, 4. 2, 3, 5. 1, 2, 3.
Why are high tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits?
To reduce the formation of corona and nitric oxide on the cable insulation. To reduce the effect of the high frequency electromagnetic waves emanated during operation. To eliminate high altitude flashover.
A method commonly used to prevent carburetor icing is to:
mix alcohol with the fuel. electrically heat the venturi and throttle valve. preheat the intake air.
On aircraft equipped with hydraulically operated constant speed propellers, all ignition and magneto checking is done with the propeller in which position?
High RPM.
High pitch range. Low RPM.
The floating control thermostat, used on some reciprocating engine installations, helps regulate oil temperature by:
controlling oil flow through the oil cooler. controlling air flow through the oil cooler. recirculating hot oil back through the sump.
Engine operating flexibility is the ability of the engine to:
run smoothly and give the desired performance at all speeds. meet exacting requirements of efficiency and low weight per horsepower ratio. deliver maximum horsepower at a specific altitude.
An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, provided the RPM is unchanged, will:
lose power due to the reduced density of the air drawn into the cylinders. produce constant power due to the same volume of air drawn into the cylinders. lose power due to the reduced volume of air drawn into the cylinders.
The purpose of directing bleed air to the outer turbine case on some engines is to:
provide up to 100 percent kinetic energy extraction from the flowing gases. allow operation in a thermal environment 600 to 800 °F above the temperature limits of turbine blade and vane alloys. provide optimum turbine blade tip clearance by controlling thermal expansion.
When is the fuel/air mixture ignited in a conventional reciprocating engine?
Shortly before the piston reaches the top of the compression stroke. When the piston reaches top dead center on the compression stroke. When the piston has reached top dead center of the intake stroke.
What occurs when a back suction type mixture control is placed in IDLE CUTOFF?
The float chamber will be vented to a negative pressure area. The fuel passage to the idle jet will be closed by a valve. The fuel passages to the main and idle jets will be closed by a valve.
What will be the likely result if the piston ring gaps happen to be aligned when performing a differential pressure compression check on a cylinder?
The rings will not be seated. Little or no effect. A worn or defective ring(s) indication.
What are two types of ac motors that are used to produce a relatively high torque?
Shunt field and single phase. Shaded pole and shunt field. Three phase induction and capacitor start.
A bent cooling fin on an aluminum cylinder head:
should be left alone if no crack has formed. should be sawed off and filed smooth. should be stop drilled or a small radius filed at the point of the bend.
Which of the following can inspect and approve an engine major repair for return to service?
Certificated mechanic with inspection authorization. Certificated mechanic with airframe and powerplant ratings. Certificated mechanic with a powerplant rating.
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the:
generator master switch. rheostat. master solenoid.
What operational force tends to bend the propeller blades forward at the tip? thrust bending force torque bending force centrifugal twisting force.
The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events? closes fuel shutoff, closes hydraulic shutoff, closes the oxygen shutoff, disconnects the generator field, and arms the fire extinguishing system closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire extinguishing system closes all firewall shutoff valves, disconnects the generator, and discharges a fire bottle.
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: solvent degreasers are much more effective water-mixed degreasers cause corrosion water mixed degreaser residues may cause engine oil contamination in the overhauled engine.
When the starter switch to the aircraft gas turbine engine starter-generator is energized and the engine fails to rotate, one of the probable causes would be the: starter solenoid is defective power lever switch is defective undercurrent solenoid contacts are defective.
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