Engine Exhaust and Reverser Systems Flashcards

1
Q

WHAT IS THE PURPOSE OF THE EXHAUST SYSTEM?

A

Remove high temp. gases and to provide protection against the potentially destructive exhaust gases

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2
Q

NAME TWO TYPES OF RECIPROCATING ENGINE EXHAUST SYSTEMS.

A

1) Short stack
2) Collector system

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3
Q

WHAT DRAWBACK IN USING COLLECTOR-TYPE EXHAUST SYSTEMS IS MORE THAN OFFSET WHEN USED
ON TURBOCHARGED ENGINES?

A

The loss of horsepower due to exhaust system back pressure

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4
Q

WHAT COULD RESULT IF THE INTERNAL BAFFLES OR DIFFUSERS IN AN EXHAUST SYSTEM FAIL?

A

Exhaust gas flow could be restricted, resulting in loss of engine power

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5
Q

WHAT TYPE OF EXHAUST SYSTEM IS USED ON TURBOCHARGED ENGINES?

A

Collector system

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6
Q

WHAT KIND OF MATERIAL IS NORMALLY USED TO MAKE THE MUFFLER SHROUDS FOUND IN THE
EXHAUST SYSTEM?

A

Stainless steel

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7
Q

HOW DO YOU INSPECT THE INTERNAL BAFFLES AND DIFFUSERS OF AN EXHAUST SYSTEM?

A

By disassembling the exhaust system as necessary and visually inspecting the components

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8
Q

WHY IS AN EXHAUST SYSTEM FAILURE CONSIDERED A SEVERE HAZARD?

A

Can result in carbon monoxide poisoning, loss of engine power, or fire

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9
Q

WHAT COULD HAPPEN IF LEAD, ZINC, OR GALVANIZED MARKS ARE MADE ON AN EXHAUST SYSTEM?

A

They cause a change in molecular structure, which could result in cracks when heated

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10
Q

WHAT HAPPENS IF THE HEAT EXCHANGER LEAKS EXHAUST GASSES INTO THE INDUCTION SYSTEM?

A

Loss of engine power

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11
Q

WHAT IS AN INDICATION OF AN EXHAUST GAS LEAK?

A

A flat gray or sooty black deposit in the area of the leak

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12
Q

WHERE ARE THE MOST COMMON PLACES TO FIND CRACKS IN AN EXHAUST SYSTEM?

A

1) Welded areas
2) Clamped areas
3) At the flanges

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13
Q

WHAT IS A COMMON CAUSE OF TURBOCHARGER WASTE GATE STICKING?

A

Coke deposits or carbon buildup

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14
Q

WHY ARE TURBOCHARGED EXHAUST SYSTEM LEAKS VERY DAMAGING AT HIGH ALTITUDES?

A

Pressure differential will cause the leak to escape with torch-like intensity

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15
Q

WHAT ARE EXHAUST SYSTEM COKE DEPOSITS?

A

Excessive carbon buildup

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16
Q

WHAT IS THE RESULT OF CHANGING THE EXHAUST NOZZLE AREA OF A TURBINE ENGINE?

A

The engine’s performance and exhaust gas temperature change

17
Q

NAME THE COMPONENTS OF A TYPICAL TURBINE EXHAUST NOZZLE.

A

Tail cone
Exhaust ducts
Support struts

18
Q

WHAT IS THE PURPOSE OF THRUST REVERSERS

A

They help decelerate an aircraft after landing

19
Q

HOW DOES A NOISE SUPPRESSOR FOUND ON OLDER TURBOJET ENGINES WORK?

A

It converts low frequency sound, which is audible over great distance, into high frequency sound, thus
reducing the sound footprint

20
Q

WHAT ARE THE TWO MOST COMMONLY USED TYPES OF THRUST REVERSERS?

A

The clamshell (or mechanically blocked) and the cascade (or aerodynamically blocked)

21
Q

HOW MUCH THRUST DO THE TRUST REVERSERS PRODUCE COMPARED TO THE ENGINE’S FULL FORWARD THRUST?

A

Substantially less

22
Q

WHAT ARE THE HAZARDS OF OPERATING SOME THRUST REVERSERS AT LOW GROUND SPEEDS?

A

Ingestion of foreign objects stirred up by the exhaust gasses and re-ingestion of hot exhaust gasses.

23
Q

WHAT HAPPENS TO TURBINE ENGINE PERFORMANCE IF THE EXHAUST NOZZLE AREA IS CHANGED?

A

The performance and exhaust gas temperature change

24
Q

WHAT IS THE FUNCTION OF THE THERMOCOUPLE PROBES IN A TURBINE EXHAUST TAILPIPE?

A

To measure exhaust gas temperature