Powerplant ASA Turbine Engine Fundamentals ASA Exam Test Questions And Answers
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Course
Powerplant ASA
Institution
Powerplant ASA
Powerplant ASA Turbine Engine
Fundamentals ASA Exam Test
Questions And Answers
8108. At what point in an axial-flow turbojet engine will the highest gas pressure
occur?
At the compressor outlet
8109. One function of the nozzle diaphragm in a turbine engine is to?
Direct the flow of gases ...
ASA Powerplant Orals Questions
with 100% Correct Answers |
Updated & Verified
In what position should the crankshaft be when a magneto is being timed to the engine?
- ANSWER The piston in cylinder no.1 should be in the correct position for ignition to
occur. This is normally about 30 degrees before top center on the compression stroke.
What is the purpose of a cold cylinder check? - ANSWER A cold cylinder check
determines which cylinder is not firing. Run the engine for a few minutes at the speed,
and on the magneto, at which it runs roughest. Shut it down and feel the exhaust stack
near the cylinder head. The cylinder with the stack that is not as hot as the others is the
cylinder that has not been firing.
What is checked on engine run up to determine the operational condition of the
engine? - ANSWER Idling RPM and manifold pressure, engine acceleration, maximum
static RPM and manifold pressure, magneto drop, ignition switch safety check, propeller
pitch change, propeller feathering, oil pressure, fuel pressure, and fuel flow.
How can you determine the firing order of an 18-cylinder radial engine? - ANSWER
Begin with cylinder 1, add 11 and subtract 7, whichever will keep the numbers between
1 and 18. 1-12-5-16-9-2-13-6-17-10-3-14-7-18-11-4-15-8.
What are two main causes of a cylinder having low compression? - ANSWER Piston
rings not seating or broken, and valves not seating or burned.
What is a hydraulic lock in an aircraft engine? - ANSWER Oil has drained past the
piston rings and filled the combustion chamber of cylinders that are below the center
line of the engine. If the crankshaft is turned over with this oil in the cylinder it will lock,
and there is a probability that the piston, cylinder, or connecting rod will be damaged.
How is a hydraulic lock removed from an aircraft engine? - ANSWER Remove a spark
plug from the locked cylinder and drain all the oil out. Clean the spark plug and reinstall
it.
What is a low-tension ignition system? - ANSWER It is an ignition system using a
magneto with a brush-type distributor and a coil that has no secondary wiring. Low
voltage is directed from the magneto to a transformer mounted on the cylinder head.
Her the low voltage is boosted to a high voltage and is directed through a very short
high-tension lead to the spark plug. There is one transformer for each spark plug.
, What is a floating cam ring on a large radial engine? - ANSWER It is a cam ring that
rides on a shelf-type bearing with a large amount of clearance between the bearing and
the ring. When adjusting the valves on an engine with a floating cam ring, the pressure
of the valve springs on the opposite side of the engine must be removed so the cam
ring will be tight against the bearing for the valves being adjusted.
Why is valve clearance adjusted on radial engines, but not on most horizontally
opposed engines? - ANSWER Most horizontally opposed engines have hydraulic valve
lifters that keep all of the clearance out of the valve train. Radial engines have solid
lifters.
Why are both the hot and cold valve clearances given for most radial engines? -
ANSWER The hot clearance is given for valve timing purposes. The timing is adjusted
with the valves in cylinder number one, set with the hot clearance. When the timing is
set, all of the valves are adjusted to their cold clearance.
What must be inspected to determine the airworthiness of an engine installation? -
ANSWER The propeller, lubrication system, ignition system, fuel metering system,
cooling system, and the exhaust system.
What checks should be made to determine the proper operation of a reciprocating
engine installation? - ANSWER Idle RPM and mixture, static RPM, propeller pitch
change operation, magneto check, ignition switch safety check, and carburetor heat
check.
Where can you find the correct grade of fuel and amount of engine lubricating oil for an
aircraft engine? - ANSWER In the Type Certificate Data Sheets (TCDS) for the aircraft.
What are the basic steps in troubleshooting an engine installation? - ANSWER A.
Know how the system should operate B. Observe how the system is operating. C.
Divide the system to find the trouble. D. Look for the obvious problems first.
Where do you find the procedures to follow when correcting a defective condition in an
aircraft engine? - ANSWER In the engine maintenance manual.
Where do you find instructions for removing an engine from an aircraft? - ANSWER In
the aircraft maintenance manual.
What must normally be done to a nose-wheel airplane before removing an engine? -
ANSWER The tail of the airplane must be supported.
What should be done to the cylinders to protect them from rust and corrosion when
preparing the engine for long-time storage? - ANSWER Spray a preservative oil inside
the cylinders and replace the spark plugs with desiccant plugs.
, What should be used to cover the ends of fuel and oil lines that have been
disconnected from the engine? - ANSWER The correct plugs or caps. Never cover the
end of a line with tape.
What is meant by a QEC engine assembly? - ANSWER An engine that has been
prepared for a quick engine change. The engine is on its mount and all of the
accessories are installed. A minimum of time is required to change engines. All that is
needed is for the controls, wiring, and fluid lines to be connected to the firewall.
What is meant by rigging the engine controls so they have some "cushion"? -
ANSWER The control on the engine component must contact its stop before the control
handle in the cockpit reaches its stop. This causes the control handle to spring back a
slight amount when it is moved to the extent of its travel.
What are two ways of pre oiling an engine? - ANSWER A. before the spark plugs are
installed and after the oil tank or sump is filled, turn the engine over with the starter until
oil runs out of the fitting to which the oil pressure gage connects. B. Use a pre oiler tank.
Air pressure forces oil through all of the passages until some of it flows from the oil
pressure gage fitting.
What is meant by a hot section inspection? - ANSWER An inspection of the hot
section of a turbine engine. The combustors, the turbine, and the exhaust systems.
What is meant by on condition maintenance of a turbine engine? - ANSWER The
monitoring of the engine performance at regular intervals and determining when
maintenance is required based on certain operating parameters specified by the engine
manufacturer.
What checks of a turbine engine are necessary to verify preflight condition? -
ANSWER Inspection of the cowling and all air inlet areas and attachment of the engine
to the airframe. Inspection of the inlet guide vanes and the first stage of the compressor
or fan blades. Check for unusual noise when the compressor is rotated. Inspection of
the rear turbine, and exhaust system. Check the quantity of the lubricating oil for the
engine and the constant speed-drive unit. Check the ignition system for operation by
listening for the sparks.
What is meant by trimming a turbine engine? - ANSWER Adjusting the fuel control so
the engine develops the correct idle and trim speed RPM.
What type of equipment should be used to determine that a turbine engine is
performing up to the standards specified by the engine manufacturer? - ANSWER A
JetCal Analyzer-Trimmer has all of the instrumentation and cables to determine the
EGT, EPR, and the other parameters specified by the engine manufacturer.
Where can you find the model of magneto that is approved for an engine specified by
the examiner? - ANSWER T C D S for the engine.
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