PP Engine Exhaust and Reverser Systems

Why is high nickel chromium steel used in many exhaust systems?

High heat conductivity and flexibility.
Corrosion resistance and low expansion coefficient.
Corrosion resistance and high heat conductivity.

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

slip joints and flexible metal tubing.
spring loaded ball joints, slip joints, and flexible metal tubing.
spring loaded ball joints, slip joints, and bellows.

One source commonly used for carburetor air heat is

turbocharger heated air.
alternate air heat.
exhaust gases.

The hot section of a turbine engine is particularly susceptible to which of the following kind of damage?

Galling.
Pitting.
Cracking.

What is the purpose of a slip joint in an exhaust collector ring?

It aids in alignment and absorbs expansion.
It reduces vibration and increases cooling.
It permits the collector ring to be installed in one piece.

Sodium-filled valves are advantageous to an aviation engine because they

are lighter.
dampen valve impact shocks.
dissipate heat well.

What type of nuts are used to hold an exhaust system to the cylinders?

Brass or heat-resistant nuts.
High-temperature fiber self-locking nuts.
High-temperature aluminum self-locking nuts.

Repair of exhaust system components

is impossible because the material cannot be identified.
must be accomplished by the component manufacturer.
is not recommended to be accomplished in the field.

On turbojet powered airplanes, thrust reversers are capable of producing between

35 and 50 percent of the rated thrust in the reverse direction.
35 and 75 percent of the rated thrust in the reverse direction.
35 and 65 percent of the rated thrust in the reverse direction.

On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected?

X-rayed to detect any cracks.
Hydrostatically tested.
With the heat air shroud removed.

How should ceramic-coated exhaust components be cleaned?

With alkali.
By degreasing.
By mechanical means.

Which of the following indicates that a combustion chamber of a jet engine is not operating properly?

Clam shells stick in thrust reverse position.
Hot spots on the tail cone.
Warping of the exhaust duct liner.

Select a characteristic of a good weld on exhaust stacks.

The weld should be built up 1/8 inch.
Porousness or projecting globules should show in the weld.
The weld should taper off smoothly into the base metal.

How do the turbines which are driven by the exhaust gases of a turbo-compound engine contribute to total engine power output?

By driving the crankshaft through suitable couplings.
By driving the supercharge, thus relieving the engine of the supercharging load.
By converting the latent heat energy of the exhaust glass into thrust by collecting and accelerating them.

How should corrosion-resistant steel parts such as exhaust collectors be blast cleaned?

Use steel grit which has not previously been used on soft iron.
Use super fine granite grit.
Use sand which has not previously been used on iron or steel.

Power recovery turbines used on some reciprocating engines are driven by the

exhaust gas pressure.
crankshaft.
velocity of the exhaust gases.

Reciprocating engine exhaust systems that have repairs or sloppy weld beats which protrude internally ae unacceptable because they cause

base metal fatigue.
localized cracks.
local hot spots.

Ball joints in reciprocating engine exhaust systems should be

tight enough to prevent any movements.
disassembled and the seals replaced every engine change.
loose enough to permit some movement.

All of the following are recommended markers for reciprocating engine exhaust systems except

India ink.
lead pencil.
Prussian blue.

How are combustion liner walls cooled in a gas turbine engine?

By secondary air flowing through the combustion chamber.
By the pattern of holes and louvers cut in the diffuser section.
By bleed air vented from the engine air inlet.

Augmenter tubes are part of which reciprocating engine system?

Induction.
Exhaust.
Fuel.

Dislodged internal muffler baffles on a small reciprocating aircraft engine may cause

excessive exhaust back pressure.
an engine over-speed problem.
high oil consumption.

What is the purpose of an exhaust outlet guard on a small reciprocating engine?

To prevent dislodged muffler baffles from obstructing the muffler outlet.
To reduce spark exit.
To shield adjacent components from excessive heat.

What could be a result of undetected exhaust system leaks in a reciprocating engine powered airplane?

Pilot/passenger incapacitation caused by carbon monoxide entering the cabin.
A rough-running engine with increased fuel consumption.
Too low exhaust back pressure resulting in the desired power settings not being attained.

How may reciprocating engine exhaust system leaks be detected?

An exhaust trail aft of the tailpipe on the airplane exterior.
Fluctuating manifold pressure indication.
Signs of exhaust soot inside cowling and on adjacent components.

Compared to normally aspirated engines, turbo-charged engine exhaust systems operate at

similar temperatures and higher pressures.
high temperatures and higher pressures.
similar temperatures and pressures.

Most exhaust system failures result from thermal fatigue cracking in the areas of stress concentration. This condition is usually caused by

the drastic temperature change which is encountered at altitude.
improper welding techniques during manufacture.
the high temperatures at which the exhaust system operates.

Thrust reversers utilizing a pneumatic actuating system usually receive operating pressure from

the engine bleed air system.
an on board hydraulic or electrical powered compressor.
high pressure air reservoirs.

Operating thrust reversers at low ground speeds can sometimes cause

hot gas re-ingestion, compression stalls, and sand or other foreign object ingestion.
abnormal exhaust gas temperatures and engine pressure ratio indications.
engine vibrations.

Engines using cold stream, or both cold and hot strream reversing, include

high bypass tubofans.
turbojets.
turbojets with afterburner.

The purpose of cascade vanes in a thrust reversing system is to

form a solid blocking door in the jet exhaust path.
turn the exhaust gases forward just after exiting the exhaust nozzle.
turn to a forward direction the fan and/or hot exhaust gases that have been blocked from existing through the exhaust nozzle.

Turbojet and turbofan thrust reverse systems are generally powered by

fuel pressure, hydraulic pressure, and pneumatic pressure.
electricity, hydraulic pressure, and pneumatic pressure.
fuel pressure and electricity.

The rearward thrust capability of an engine with the thrust reverser system deployed is

less than its forward capability.
greater than its forward capability.
equal to its forward capability.

Which of the following statements is true regarding thrust reverser systems?

The reverser system must be able to withstand high temperatures, be mechanically strong, relatively light in weight, and reliable.
Engine thrust reversers on the aircraft usually will operate independently of each other.
Mechanical blockage system design permits a deployment position aft of the exhaust nozzle only.

What is the proper operating sequence when using thrust reversers to slow an aircraft after landing?

Advance thrust levers up to takeoff position as conditions require, select thrust reverse. de-select thrust reverser, retard thrust levers to ground idle.
Retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle.
Select thrust reverse, advance thrust reverser levers no higher than 75 percent of N₁ and retard thrust reverser levers to idle at approximately normal taxi speed.

PP Engine Exhaust and Reverser Systems

PP Engine Exhaust and Reverser Systems

Jon K

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