AIRCRAFT PROPULSION SYSTEMS EXAM QUESTIONS AND ANSWERS

Engine cylinder parts (WESIVPRC) - ANSWER W water jacket (for coolant
flow
E exhaust camshaft
S spark plug
I intake camshaft
V valves
P piston
R connecting rod
C crankshaft

Aero engine difference from Car engine 2# - ANSWER -Unlike automobile
engines, those on aircraft run high power for a long amount of time. Engine
typically 65-75% full power
-Engine designs tend to favour reliability over performance

Wright brothers did what? #2 - ANSWER -First successful aero engine
-first successful flight 1903

Jean Joseph did what? - ANSWER -1st practical gas engine built by Jean
Joseph. 1860

When did the commercial airline industry begin? - ANSWER 1948

What was Hero's Aeolipili - ANSWER -Converted steam pressure to
mechanical power.s

When was the first rocket used? - ANSWER - by the Chinese in 1230

The 4 stroke cycle was created? 2# - ANSWER -Otto and Langen 1876

First time Gasoline was used as fuel? - ANSWER Brayton 1876

second fully functioning 4 stroke cycle? - ANSWER Karl Benz

,WW1 Aircraft engines 3# - ANSWER -Rotary
-in line
-V type

Radial Engine Significance, Positives, negatives? 3# - ANSWER -Work horse
ever since the 1920's for military and commercial use. (two or more rows)
Positives: low weight to power ratio, easier to cool, simple to work on
Negatives: Greater drag, hard to maneuver, bad oil leading to illness.

Opposed Engine Significance, Positives, negatives? 3# - ANSWER -The most
popular for light conventional aircraft and helicopters. (Economical)
-Positives: Lower power to weight ratio, extraordinarily stable, fairly
streamlined

Inline Engine Significance, Positives, negatives? 3# - ANSWER -Very popular
for fighter aircraft and high speed aircraft
-positives: Very streamlined, Shorter landing gear
-Negatives: Low horse power, lowest power to weight ratio, Limited in
horsepower

Best way of arranging and designing engine classification. - ANSWER -
Cylinder engine arrangement

3 main characteristics that people look for in an engine. For Aviation -
ANSWER Strong, Reliable, Lightweight

V-type Engine Significance, Positives, negatives? 3# - ANSWER -Very good
middle ground type of engine, used quite a bit in cars.
-Positives: Good power to rate ratio, Very streamlined, higher horse power

Crankcase definition - ANSWER -The housing that encloses various
mechanisms surrounding the engines crankshaft
-Must be made our of strong materials

Functions of the crank case 7# MCO(I/E)MC - ANSWER -must support itself
-Contains the bearings in which the crankshaft revolves
-provides a tight enclosure for lubricating oil

, -supports various internal and external mechanisms of the powerplant
-provides mountings for attaching the engine to the airframe
-provides support for the attachment of the cylinders
-strengthens the rigidity and misalignmnet prevention of the crankshaft

Bearings - ANSWER A surface that supports or is supported by another
surface

Plain Bearings - ANSWER Cup of metal designed to take radial loads, Cam,
cranks.

Roller bearing - ANSWER Designed for radial and thrust loads

ball bearings - ANSWER Designed for thrust load and provides the least
amount of friction

The crankshaft - ANSWER -Transform the reciprocating motion of the piston
and connecting trod. Turns the propeller
-Cranks also called throws
-BACKBONE OF THE ENGINE

Main Journal - ANSWER the part of the crank shaft that keeps it aligned

Crankpin - ANSWER -The part that connects to the connecting rod
-it also allows lubrication for the oil and carbon build up to flow

Crank Cheek - ANSWER - Connects the crank pin to the journal

Dampening weights - ANSWER added on to the counter weight for WHIP
AND VIBRATION OF CRANKSHAFT

counter weights - ANSWER used for stability added to the cheek for crank
shaft BALANCE

types of crankshafts 4# - ANSWER -Single throw: used in single row radial
engine
-Double throw: double row radial engine