Module 1 and 2 0engines

Question 1

what is detonation

Answer 1

uncontrolled explosion of fuel/air mixture

Question 2

how calculate compression ratio

Answer 2

Total volume of cylinder
____________________
combustion chamber volume

Question 3

where is MAP taken

Answer 3

between the carburetor and throttle

Question 4

what is pre-ignition

Answer 4

premature ignition of fuel/air mixture

Question 5

what is a heat engine

Answer 5

convert heat energy by combustion

Question 6

what is the aprox thermal-efficiency of an internal combustion ?

Answer 6

30% heat

Question 7

example of internal engine and external engine

Answer 7

internal =opposed 4 stroke

external =steam engine

Question 8

pistons rings ac engines made of ?

Answer 8

• gray cast iron

- chrome plated

Question 9

3 types of rings

Answer 9

• compression
• oil control
• oil wiper (scraper)

Question 10

Compression rings have 3 types of cross

Answer 10

• Rectangular
• tapered
• wedge

Question 11

must common type of ring joint?

Answer 11

butt

Question 12

to compensate for uneven expansion heat the piston is

Answer 12

cam ground -larger diameter

Question 13

undersides of pistons are frequently finned primarily ?

Answer 13

to aid cooling

Question 14

pistons are machined from what type of alloy?

Answer 14

aluminum

Question 15

pistons are classified by head design

Answer 15

• flat
• cupped
• dommed

Question 16

the area between the pistons ring groves is called

Answer 16

Ring land

Question 17

purpose of the a piston ring

Answer 17

• provide seal
• prevent excessive oil
• conduct heat

Question 18

types of bearings commonly used

Answer 18

• plain
• roller
• ball

Question 19

how you clean pack and inspect an anti-friction roller bearing

Answer 19

• clean in solvent
• air dry (don’t spin)
• 10 power magnifying glass

Question 20

if exhaust valve open to early what happen ?

Answer 20

loss power

Question 21

what is a valve overlap?

Answer 21

number of degrees during intake valve and exhaust valves are open

Question 22

what type of engine would you expect to see a camshaft in?

Answer 22

opposed-in line-v type

Question 23

if intake valve opens to early what symptom will occur ?

Answer 23

back fire in the induction system

Question 24

what is the fit of the piston pin to the piston boss

Answer 24

palm push fit

Question 25

an engine cylinder is a two piece construction consisting of ?

Answer 25

- cylinder head | - barrel

Question 26

when referring to the cylinder numbers on an opposed engine from what direction does one look

Answer 26

-always from the back

Question 27

what is the purpose of a piston

Answer 27

-draw air -transmit force from the cylinder -manage the pressure in the cylinder and transmit the force of combustion to the connecting rod

Question 28

knuckle pin is used to ?

Answer 28

connect articulating rods to the master rods

Question 29

what color is used to identify a nitrate cylinder

Answer 29

-blue

Question 30

what is the purpose of the choke bore cylinder

Answer 30

compensate for the uneven expansion cause by heat

Question 31

what precaution is necessary for metal sodium filled valves ?

Answer 31

sodium is dangerous material that burns violently when exposed to air

Question 32

why poppet valve

Answer 32

pops open and close

Question 33

when the exhaust valve open and close in the 4 cycle

Answer 33

open before TDC on the power stroke and closes after TDC on the intake stroke

Question 34

where in the induction system is map measured

Answer 34

downstream of carburetor after the throttle valve

Question 35

will MAP ever be higher than the ambient pressure?

Answer 35

only in a turbo charged

Question 36

what does the red arc indicate on the RPM gauge

Answer 36

max power RPM

Question 37

what kind of ring can withstand higher temp

Answer 37

chrome plated ring

Question 38

what are the piston pin made of

Answer 38

Nickel steel alloy

Question 39

what kind of pin is used in the lycoming O-320A23

Answer 39

full floating

Question 40

what is the most common pin retainer

Answer 40

piston pin plug

Question 41

where is the valve clearance measured

Answer 41

between the rocker arm and valve tip

Question 42

what type of engine uses a cam ring

Answer 42

radial

Question 43

why some engine have gear reduction

Answer 43

to keep the speed of the propeller to achieve max efficiency

Question 44

oil pressure is calculate in what unit

Answer 44

PSI ( pounds per square inch)

Question 45

what is the valve overlap

Answer 45

period when the intake valve and exhaust valve are both open

Question 46

when is the valve clearance set and how is it adjusted on the O320-A23 engine

Answer 46

cold clearance by changing the length of the push rod

Question 47

how manu revolutions to complete all 4 stokes

Answer 47

two

Question 48

4 strokes of the engine

Answer 48

- intake - compression - power - exhaust

Question 49

the crankshaft change linear motion into

Answer 49

rotational motion

Question 50

dynamic damper is for the purpose of ?

Answer 50

dampening torsional vibrations

Question 51

main part of crankshaft

Answer 51

- main journals - crank pins - crank cheek

Question 52

the crankcase supports the crankshaft by

Answer 52

main journals

Question 53

aircraft piston engines are classified

Answer 53

- air cooled and liquid cooled - internal or external combustion - by cylinder arrange =V type, opposed , in line, radial - naturally aspired or turbocharger - Otto cycle or diesel - 4 stroke or 2 stroke - carburetor or fuel injector

Question 54

engine noted as a freedom vibrations

Answer 54

horizontally opposed

Question 55

what are the 5 events on a cycle

Answer 55

- intake - compression - ignition - power - exhaust

Question 56

least friction bearing

Answer 56

ball bearing

Question 57

general manufactures required

Answer 57

- efficiency - economy - reliability - durability

Question 58

what makes diesel ideal for an aircraft power plant

Answer 58

low RPM and high torque

Question 59

diesel advantages

Answer 59

- high durability - better efficiency - time to be overhaul

Question 60

difference between otto and diesel

Answer 60

- compression ratio is higher | - diesel has not spark plug

Question 61

which gauge is important to monitor during the engine start

Answer 61

-oil pressure

Question 62

will the CHT gauge increase with a reach mixture ?

Answer 62

no, it will decrease

Question 63

what does the EGT gauge measured

Answer 63

indicates exhaust gas temp used to set mixture

Question 64

how is the IHP calculated ?

Answer 64

plank /33.000 horsepower

Question 65

IHP = FHP= BHP= IMEP=

Answer 65

indicate horse power friction horse power brake horse power indicated mean effective pressure