Engine Exhaust and Reverser Systems

Powerplant (AMP) ASA Prepware Questions with ENGINE EXHAUST AND REVERSER SYSTEMS

Dislodged internal muffler baffles on a small reciprocating engine may cause

excessive exhaust back pressure.

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

The engine bleed air system.

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

Retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle.

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

It aids in alignment and absorbs expansion.

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

the high temperatures at which the exhaust system operates.

Ball joints in reciprocating engine exhaust systems should be

loose enough to permit some movement.

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

Corrosion resistance and low expansion coefficient.

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

lead pencil.

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

By secondary air flowing through the combustion chamber.

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

To prevent dislodged muffler baffles from obstructing the muffler outlet.

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

With the heater air shroud removed.

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

Hot spots on the tail cone.

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

Use sand which has not previously been used on iron or steel.

Augmenter tubes are part of which reciprocating engine system?

Exhaust

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.

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.

Operating thrust reversers at low ground speeds can sometimes cause…

hot gas re-ingestion, compressor stalls, and sand or other foreign object ingestion.

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

Cracking

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

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

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

local hot spots.

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

high bypass turbofans.

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

dissipate heat well.

Compared to normally aspirated engines, turbocharged engine exhaust systems operate at

higher temperatures and higher pressures.

Turbojet and turbofan thrust reverser systems are generally powered by

electricity, hydraulic pressure, and pneumatic pressure.

Select a characteristic of a good weld on exhaust stacks.

The weld should taper off smoothly into the base metal.

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

less than its forward capability.

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

turn to a forward direction the fan and / or hot exhaust gases that have been blocked from exiting through the exhaust nozzle.

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

Brass or heat-resistant nuts.

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

velocity of the exhaust gases.

How may reciprocating engine exhaust system leaks be detected?

Signs of exhaust soot inside cowling and on adjacent components.

How should ceramic-coated exhaust components be cleaned?

By degreasing.

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.

Repair of exhaust system components

is NOT recommended to be accomplished in the field.

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

spring loaded ball joints, slip joints, and bellows.