Powerplant ASA Baker-s School List of FAA Oral Questions and answers.
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Course
GFACT Certification
Institution
GFACT Certification
Powerplant ASA Baker-s School List of FAA Oral Questions and answers. Powerplant ASA Baker-s School List of FAA Oral Questions and answers. Powerplant ASA Baker-s School List of FAA Oral Questions and answers. Powerplant ASA Baker-s School List of FAA Oral Questions and answers.
Powerplant ASA/Baker's School List of FAA Oral Questions
Powerplant ASA/Baker's School List of FAA
Oral Questions and answers
1. What is the main advantage of a horizontally opposed engine over a
radial engine for powering modern aircraft?: The horizontally opposed
engine has a much smaller frontal area and is easier to streamline than
a radial engine.
2. How many throws are there in the crankshaft of a six-cylinder
horizontally opposed engine?: six
3. What kind of connecting rod arrangement is used in a radial engine?:
A master rod connects the single throw of the crankshaft with a piston.
All other pistons are connected to the master rod with link rods.
4. Of what material are most piston rings made?: gray cast iron
5. What is the reason for using hydraulic valve lifters in an aircraft
engine?: Hydraulic lifters keep all the clearance out of the valve
, .
operating mechanism. This decreases the wear of the valve train
components.
6. At what speed does the camshaft turn in relation to the crankshaft?:
one half the speed of the crankshaft
7. What kind of main bearings are used in a horizontally opposed
engine?: steel backed, lead-alloy inserts
8. On what stroke is the piston when the intake valve begins to open?:
exhaust stroke
9. On what stroke is the piston when the exhaust valve begins to close?:
power stroke
10. Why are both hot and cold clearances given for radial engines?: The
hot clearance is given for valve timing purposes. The timing is adjusted
with the valves in the number one piston adjusted with the hot
clearance. When the timing is set, all of the valves are adjusted to their
cold clearance.
, .
11. What is meant by "cam-ground" piston?: A piston that is not
perfectly round. When the piston reaches operating temperature, the
metal in the piston pin boss expands enough that the piston becomes
perfectly round.
12. Where is the piston when the ignition spark occurs?: 30 degrees
before TDC 13. What is a "full-floating" wrist pin?: a wrist pin that is
not clamped in either the piston or the connecting rod. soft metal plugs
keep the floating pin from scoring the cylinder wall.
14. Why do most engines use more than one spring on each valve?:
Different springs with different diameter and pitch have different
resonant frequencies which minimize valve float.
15. Would excessive valve clearance cause the valves to open early or
late?: open late and close early
16. What is the purpose of valve overlap? (2): Exhaust gas inertia
leaving the cylinder helps the fresh induction charge flow into the
, .
cylinder leading to 1) better volumetric efficiency 2) lower cylinder
temperatures.
17 What types of piston rings are installed on the pistons?: compression
rings, oil control rings, oil wiper rings
18. Why are some exhaust valves partially filled with metallic sodium?:
It melts at operating temperature. Sloshing back and forth, it picks up heat,
transfers heat to the valve stem which in turn transfers it to the cylinder
head.
19. What causes detonation?: Excessive heat and pressure in the cylinder
causes the fuel-air mixture to reach its critical pressure and temperature
which causes an explosion rather than a controlled burn.
20. Why is a compression check important in determining the
condition of an engine?: The compression check determines the condition
of the seal between the piston rings and the cylinder walls, and the seal
between the valves and their seats. 21. What is meant by compression
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