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POWERPLANT ORALS
CHAPTER 6 - EXHAUST SYSTEMS
Question | Answer |
---|---|
WHAT IS THE PURPOSE OF THE EXHAUST SYSTEM? | TO REMOVE HIGH TEMPERATURE NOXIOUS GASES. |
NAME TWO TYPES OF RECIPROCATING ENGINE EXHAUST SYSTEMS. | THE SHORT STACK AND THE COLLECTOR SYSTEM. |
WHAT DRAWBACK IN USING COLLECTOR-TYPE EXHAUST SYSTEMS IS MORE THAN OFFSET WHEN USED ON TURBOCHARGED ENGINES? | THE LOSS OF HORSEPOWER DUE TO EXHAUST SYSTEM BACK PRESSURE. |
WHAT COULD RESULT IF THE INTERNAL BAFFLES OR DIFFUSERS IN AN EXHAUST SYSTEM FAIL? | THE FLOW OF THE EXHAUST GASSES COULD BE RESTRICTED, RESULTING IN A LOSS OF ENGINE POWER. |
WHAT TYPE OF EXHAUST SYSTEM IS USED ON TURBOCHARGED ENGINES? | THE COLLECTOR SYSTEM. |
WHAT KIND OF MATERIAL IS NORMALLY USED TO MAKE THE MUFFLER SHROUDS FOUND IN THE EXHAUST SYSTEM? | STAINLESS STEEL. |
HOW DO YOU INSPECT THE INTERNAL BAFFLES AND DIFFUSERS OF AN EXHAUST SYSTEM? | BY DISASSEMBLING THE EXHAUST SYSTEM AS NECESSARY AND VISUALLY INSPECTING THE COMPONENTS. |
WHY IS AN EXHAUST SYSTEM FAILURE CONSIDERED A SEVERE HAZARD? | IT CAN RESULT IN CARBON MONOXIDE POISONING, LOSS OF ENGINE POWER, OR FIRE. |
WHAT COULD HAPPEN IF LEAD, ZINC, OR GALVANIZED MARKS ARE MADE ON AN EXHAUST SYSTEM? | THEY CAUSE A CHANGE IN MOLECULAR STRUCTURE, WHICH COULD RESULT IN CRACKS WHEN HEATED. |
WHAT HAPPENS IF THE HEAT EXCHANGER LEAKS EXHAUST GASSES INTO THE INDUCTION SYSTEM? | THERE IS A LOSS OF ENGINE POWER. |
WHAT IS AN INDICATION OF AN EXHAUST GAS LEAK? | A FLAT GRAY OR SOOTY BLACK DEPOSIT IN THE AREA OF THE LEAK. |
WHERE ARE THE MOST COMMON PLACES TO FIND CRACKS IN AN EXHAUST SYSTEM? | AT WELDED OR CLAMPED AREAS AND AT THE FLANGES. |
WHAT IS A COMMON CAUSE OF TURBOCHARGER WASTE GATE STICKING? | COKE DEPOSITS OR CARBON BUILDUP. |
WHY ARE TURBOCHARGED EXHAUST SYSTEM LEAKS VERY DAMAGING AT HIGH ALTITUDES? | PRESSURE DIFFERENTIAL WILL CAUSE THE LEAK TO ESCAPE WITH TORCH-LIKE INTENSITY. |
WHAT ARE EXHAUST SYSTEM COKE DEPOSITS? | EXCESSIVE CARBON BUILDUP. |
WHAT IS THE RESULT OF CHANGING THE EXHAUST NOZZLE AREA OF A TURBINE ENGINE? | THE ENGINE'S PERFORMANCE AND EXHAUST GAS TEMPERATURE CHANGE. |
NAME THE COMPONENTS OF A TYPICAL TURBINE EXHAUST NOZZLE. | THE TAIL CONE, EXHAUST DUCTS AND SUPPORT STRUTS. |
WHAT IS THE PURPOSE OF THRUST REVERSERS? | THEY HELP DECELERATE AN AIRCRAFT AFTER LANDING. |
HOW DOES A NOISE SUPPRESSOR FOUND ON OLDER TURBOJET ENGINES WORK? | IT CONVERTS LOW FREQUENCY SOUND, WHICH IS AUDIBLE OVER GREAT DISTANCE, INTO HIGH FREQUENCY SOUND THUS REDUCING THE SOUND FOOTPRINT. |
WHAT ARE THE TWO MOST COMMONLY USED TYPES OF THRUST REVERSERS? | THE CLAMSHELL (OR MECHANICALLY BLOCKED) AND THE CASCADE (OR AERODYNAMICALLY BLOCKED). |
HOW MUCH THRUST DO THE THRUST REVERSERS PRODUCE COMPARED TO THE ENGINE'S FULL FORWARD THRUST? | SUBSTANTIALLY LESS. |
WHAT ARE THE HAZARDS OF OPERATING SOME THRUST REVERSERS AT LOW GROUND SPEEDS? | INGESTION OF FOREIGN OBJECTS STIRRED UP BY THE EXHAUST GASSES AND RE-INGESTION OF HOT EXHAUST GASSES. |