What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?
The pressure is inversely proportional to the velocity. The pressure is directly proportional to the velocity. There is no direct relationship between the pressure and the velocity.
The type of ignition system used on most turbine aircraft engines is:
low tension. high resistance. capacitor discharge.
What speed must an eight-pole ac generator turn to produce 400-Hertz ac?
400 RPM. 1,200 RPM. 6,000 RPM.
What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground?
A latch mechanism composed of springs and lock pins. Accumulator provided oil pressure. Propeller cylinder air pressure.
If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is:
broken or weak pressure relief valve spring. air lock in the scavenge pump intake. low oil supply.
When running up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to:
free the dome of any entrapped air. test the maximum RPM setting of the governor. seat the blades fully against the low pitch stop.
In a turbine engine, where is the turbine discharge pressure indicator sensor located?
At a location in the exhaust cone that is determined to be subjected to the highest pressures. At the aft end of the compressor section. Immediately aft of the last turbine stage.
Which statements are true regarding aircraft engine propulsion?
1. An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air.
2. Turbojet and turbofan engines impart a relatively large amount of acceleration to a smaller mass of air.
3. In modern turboprop engines, nearly 50 percent of the exhaust gas energy is extracted by turbines to drive the propeller and compressor with the rest providing exhaust thrust. 1, 2, 3. 1, 3. 1, 2.
Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?
A cracked cylinder baffle. Too much cooling fin area broken off. Cowling air seal leakage.
How does a dual axial flow compressor improve the efficiency of a turbojet engine?
The velocity of the air entering the combustion chamber is increased. Higher compression ratios can be obtained. More turbine wheels can be used.
The fuel systems of aircraft certificated in the standard classification must include which of the following? a positive means of shutting off the fuel to all engines an engine driven fuel pump and at least one auxiliary pump per engine a reserve supply of fuel, available to the engine only after selection by the flightcrew, sufficient to operate the engines at least 30 minutes at METO power.
(Refer to powerplant figure 4.) In a 28-volt system, what is the maximum continuous current that can be carried by a single no. 10 copper wire 25 feet long, routed in free air? 35 amperes 20 amperes 28 amperes.
Who establishes the recommended operating time between overhauls (TBO) of a turbine engine used in general aviation? the engine manufacturer the FAA The operator (utilizing manufacturer data and trend analysis) working in conjunction with the FAA.
If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate? moves off scale on the high side of the meter moves off scale on the zero side of the meter normal temperature for prevailing condition.
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.
An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to: remain relatively constant increase decrease.
Compared to normally aspirated engines, turbocharged engine exhaust systems operate at: similar temperatures and higher pressures similar temperatures and pressures higher temperatures and higher pressures.
High tooth pressures and high rubbing velocities, such as occur with spur type gears, require the use of: an EP lubricant straight mineral oil metallic ash detergent oil.
The abbreviation Pt7 used in turbine engine terminology means: the total pressure at station no. 7 the total inlet pressure pressure and temperature at station no. 7.
A method commonly used to prevent carburetor icing is to: mix alcohol with the fuel preheat the intake air electrically heat the venturi and throttle valve.
The fuel flowmeter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across the:
metering valve. manifold valve. fuel nozzles.
Which statement is correct regarding the ignition system of a turbine engine?
The system generally includes a polar inductor type magneto. The system is normally de energized as soon as the engine starts. It is energized during the starting and warmup periods only.
What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?
The pressure is inversely proportional to the velocity. The pressure is directly proportional to the velocity. There is no direct relationship between the pressure and the velocity.
(1) In a turbine engine axial flow compressor, each consecutive pair of rotor and stator blades constitutes a pressure stage.
(2) In a turbine engine axial flow compressor, the number of rows of stages is determined by the amount of air and total pressure rise required.
Regarding the above statements, both No. 1 and No. 2 are true. only No. 1 is true. only No. 2 is true.
What unit in a tachometer system sends information to the indicator?
The synchronous motor. The two phase ac generator. The three phase ac generator.
The fuel pump relief valve directs excess fuel to the:
fuel tank return line. inlet side of the fuel strainer. inlet side of the fuel pump.
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.
Cylinder walls are usually lubricated by:
splashed or sprayed oil. oil that is picked up by the oil control ring when the piston is at bottom center. a direct pressure system fed through the crankshaft, connecting rods, and the piston pins to the oil control ring groove in the piston.
Which statement is generally true regarding thrust reverser systems?
Mechanical blockage system design permits a deployment position aft of the exhaust nozzle only. It is possible to move some aircraft backward on the ground using reverse thrust. Engine thrust reversers on the same aircraft usually will not operate independently of each other (must all be simultaneously).
Alignment of the marks provided for internal timing of a magneto indicates that the:
magneto is in E gap position. No. 1 cylinder is on TDC of compression stroke. breaker points are just beginning to close for No. 1 cylinder.
Which of the following is regulated in a generator to control its voltage output? speed of the armature number of windings in the armature the strength of the field.
Which of the following generally renders an aluminum alloy propeller unrepairable? any slag inclusions or cold shuts any repairs that would require shortening and re-contouring of blades transverse cracks of any size.
Where is the engine fuel shutoff valve usually located? aft of the firewall adjacent to the fuel pump downstream of the engine driven fuel pump.
As an aircraft engine's speed is increased, the voltage induced in the primary coil of the magneto: increases varies with the setting of the voltage regulator remains constant.
A term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is: stacking stepping strapping.
Which of the following conditions would most likely lead to detonation? late ignition timing use of fuel with too low an octane rating use of fuel with too high an octane rating.
Igniter plugs used in turbine engines are subjected to high intensity spark discharges and yet they have a long service life because they: operate at much lower temperatures do not require continuous operation are not placed directly into the combustion chamber.
Boost manifold pressure is generally considered to be any manifold pressure above: 50 inches hg 14.7 inches hg 30 inches hg.
The primary purpose of the air bleed openings used with continuous flow fuel injector nozzles is to: lean out the mixture aid in proper fuel vaporization provide for automatic mixture control.
An advantage of the axial flow compressor is its: low starting power requirements high peak efficiency low weight.
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