BAKER'S SCHOOL OF AERONAUTICS POWERPLANT Exam Questions and Answers
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Course
AERONAUTICS POWERPLANT
Institution
AERONAUTICS POWERPLANT
BAKER'S SCHOOL OF AERONAUTICS POWERPLANT Exam Questions and Answers
1. How are conventional reciprocating engines classified?: According to cylin- der arrangements to the crankshaft or according to method of cooling
BAKER'S SCHOOL OF AERONAUTICS POWERPLANT Exam
Questions and Answers
,1. How are conventional reciprocating engines classified?: According to
cylin- der arrangements to the crankshaft or according to method of
cooling
2. What are the different types of piston rings?: Compression, Oil control
and scraper rings
3. What are the main causes of a cylinder having low compression?:
Broken piston rings, rings that are not seating properly, burnt valves
and poorly seated valves
4. What is the purpose of the oil control rings?: They are used to control
the thickness of the oil film on the cylinder walls
5. What may be the result of installing piston rings incorrectly?: Excessive
oil consumption
6. What type of piston rods are commonly found in radial engines?: A
master and articulating rod assembly
7. What type of bearings are generally used in reciprocating engines?:
Plain, roller, ball bearing
8. What is the indication of valve blowby?: hissing or a whistle when
pulling the propeller through by hand
9. What is the purpose of using more than one spring for valve closing?: -
Valve springs resonate at certain engine speeds, two springs help
eliminate valve float
10.What is the purpose of valve overlap?: It allows better volumetric
efficiency and lowers cylinder operating temperatures
11.Describe the inspection you would give the valve springs during
engine overhaul.: Clean them and visually inspect them for overheat
damage and crack-ing
12.What is the purpose of using valves with sodium filled stems?: Sodium
is an excellent heat conductor and aids in dissipating heat to the
cooling fins
13.What causes engine sudden stoppage?: Striking an object or engine
seizure
14. What type inspection must be made after sudden stoppage of an
engine?-
: Complete engine tear down and inspection
15.What is the purpose of the crankshaft dynamic dampers used in
aircraft engines?: To overcome forces causing crankshaft deflection
and torsional vibra- tion
,
, BAKER'S SCHOOL OF AERONAUTICS:
POWERPLANT
16.How would you make a runout check on a crankshaft that is still
installed on the engine?: Remove the propeller and attach a dial
indicator guage
17.What is detonation?: Explosive ignition of the fuel/air mixture
within the cylinder combustion chamber
18.What cylinder is engine to magneto timing based on?: The number
one cylinder
19.What is engine sudden speed reduction?: When the propeller
strikes an object but continues to run
20.What can be learned about the condition of an engine by studying the
results of a compression check?: Can determine if the valves, piston
rings, and pistons are properly sealing the combustion chamber
21.How can a cold cylinder be located on a double row radial engine?:
With a cold cylinder indicator or by placing your hand on the rocker
box
22.What instrument can be used to check bore for out of roundness?: A
dial indicator
23.What would a cold cylinder indicate?: That there has been no
combustion inside the cylinder
24.Where is a crack most likely to occur on a piston?: Where the piston
pin connects (thinnest point)
25.What should be done to a nose wheel airplane before removing
the engine?: Support the tail of the airplane
26.What are the major components of a typical gas turbine engine?: Air
inlet, compression section, combustion section, turbine section,
exhaust section, and accessory section
27.What are the two principle types of compressors used in turbojet
air- craft?: Centrifugal flow and axial flow
28.What are the four combustion chamber systems?: Can, annular, can-
annu- lar, and reverse-flow annular
29.What is the purpose of the interconnector tubes between can type com-
bustion chambers?: To spread the flame for chambers not equipped
with igniter plugs
30.What prevents burning of the liner walls of can type combustion
cham- bers?: Louvers
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