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POWERPLANT ORALS
CHAPTER 5 - INDUCTION SYSTEMS
Question | Answer |
---|---|
NAME THE THREE COMPONENTS ON THE INDUCTION SYSTEM OF A RECIPROCATING ENGINE. | THE AIR SCOOP, CARBURETOR OR FUEL CONTROL, AND THE INTAKE MANIFOLD. |
WHAT COULD HAPPEN IF THE INDUCTION SYSTEM BECOMES OBSTRUCTED? | THE ENGINE MAY NOT BE ABLE TO PRODUCE ITS RATED POWER OR IT MAY NOT RUN AT ALL. THIS MAY ALSO BE AN INDICATION OF A DIRTY AIR INLET FILTER. |
HOW IS INDUCTION ICING CATEGORIZED? | AS IMPACT ICE, FUEL EVAPORATION ICE, AND THROTTLE ICE. |
WHAT IS THE COMMON METHOD USED TO PREVENT INDUCTION SYSTEM ICE IN A RECIPROCATING ENGINE? | RAISE THE TEMPERATURE OF INDUCTION AIR WITH A PREHEATER. |
WHAT CAUSES FUEL EVAPORATION ICE? | FUEL EVAPORATION ICE IS FORMED BECAUSE OF THE DECREASE IN AIR TEMPERATURE RESULTING FROM EVAPORATION OF THE FUEL AFTER IT IS INTRODUCED INTO THE AIR STREAM. |
IS CARBURETOR THROTTLE ICE MORE LIKELY TO OCCUR AT A HIGHER OR LOWER POWER SETTING? WHY? | AT A LOWER POWER SETTING BECAUSE THE THROTTLE IS PARTLY CLOSED, OFFERING A LARGER SURFACE AREA FOR ICE ACCUMULATION. |
WHAT MAY BE THE INDICATION OF LEAKING INTAKE PIPES? | THE ENGINE RUNS ROUGH AT LOW RPM. |
WHAT HAPPENS TO ENGINE POWER WHEN THE CARBURETOR HEAT IS APPLIED? | THERE IS A NOTICEABLE DROP IN POWER. |
WHAT COULD HAPPEN IF CARBURETOR HEAT IS APPLIED AT HIGH ENGINE POWER SETTINGS? | DETONATION. |
WHAT ARE TWO TYPES OF SUPERCHARGED INDUCTION SYSTEMS? | INTERNALLY DRIVEN AND EXTERNALLY DRIVEN. |
HOW AND AT WHAT POINT DOES AN INTERNALLY DRIVEN SUPERCHARGER BOOST AIR PRESSURE? | AN (ENGINE-DRIVEN) IMPELLER COMPRESSES THE FUEL/AIR MIXTURE AFTER IT LEAVES THE CARBURETOR. |
WHAT IS USED TO POWER A TURBOCHARGER? | ENGINE EXHAUST GAS DIRECTED ONTO THE TURBOCHARGER TURBINE. |
WHAT COULD RESULT IF THE WASTE GATE ON A TURBOCHARGER SYSTEM DOES NOT CLOSE FULLY? | THE ENGINE MAY NOT BE ABLE TO PRODUCE ITS RATED POWER AT CERTAIN ALTITUDES, AND THE AIRCRAFT MAY NOT BE CAPABLE OF REACHING CRITICAL ALTITUDE. |
WHAT FUNCTION DOES A TURBOCHARGER WASTE GATE PERFORM? | IT CONTROLS THE AMOUNT OF EXHAUST GAS EITHER INTO OR AROUND THE TURBOCHARGER, THUS CONTROLLING THE BOOST PRESSURE OF THE TURBOCHARGER. |
WHAT COULD CAUSE A TURBOCHARGED ENGINE TO SURGE? | THERE COULD BE A WASTE GATE OR CONTROLLER MALFUNCTION. |
WHAT ARE THE MOST COMMON WAYS TO CONTROL A WASTE GATE? | EITHER MECHANICALLY WITH LINKAGES TO THE THROTTLE OR A SEPERATE CONTROL, OR BY AN ACTUATOR THAT IS DRIVEN BY OIL PRESSURE. |
IN A PRESSURIED RECIPROCATING AIRCRAFT, WHAT COMPONENT IN THE TURBOCHARGER SYSTEM IS USED TO LIMIT THE AMOUNT OF TURBOCHARGER AIRFLOW USED FOR CABIN PRESSURIZATION? | THE SONIC VENTURI. |
WHAT IS THE FUNCTION OF A DIVERGENT-SHAPED JET ENGINE INLET DURING SUBSONIC FLIGHT? | IT CAUSES THE AIR VELOCITY TO DECREASE WITH A SUBSEQUENT INCREASE IN AIR PRESSURE. |
WHERE ARE BELLMOUTH INLET DUCTS TYPICALLY FOUND? | ON HELICOPTER ENGINES. |
HOW DO VENTURI-TYPE PARTICLE SEPARATORS, FOUND ON MANY TURBINE POWERED HELICOPTERS, FUNCTION? | A VENTURI IS USED TO ACCELERATE THE FLOW OF INCOMING AIR AND DEBRIS THROUGH A CURVED INTAKE. THE DEBRIS GAINS TOO MUCH INERTIA TO ALLOW IT TO FOLLOW THE CURVED INTAKE TOWARDS THE ENGINE, AND IS CHANNELED AWAY FROM THE COMPRESSOR. |
WHAT ARE THE MOST COMMON METHODS USED FOR ANTI-ICING OF TURBINE ENGINE INLET DUCTS? | ENGINE BLEED AIR AND ELECTRIC HEATING ELEMENTS. |