AMT 124 PISTON ENGINES

Question 1

without a powerplant, the ________ was never
developed.

Answer 1

Aerial screw

Question 2

By placing further rows of cylinders behind the first produced ______ and ______

Answer 2

Double and Triple Bank radials

Question 3

These engines, although very powerful, had the disadvantage of being heavy and presenting a large frontal area as they were air - cooled

Answer 3

Radial Engine

Question 4

Barber’s engine was neither _____
nor _____.

Answer 4

efficient nor practical

Question 5

These pistons are arranged
radially around a single crank. Although drag was increased the engines were light, rigid and produced high power.
_____ engines always have an odd number of cylinders.

Answer 5

Radial Engine

Question 6

It is defined as the linear distance that the piton moves in the cylinder

Answer 6

Stroke

Question 7

the first patent for heat engine was taken out in _____ by
JOHN BARBER

Answer 7

1791

Question 8

Early aircraft used _____
engines. These have their cylinders arranged in a straight line,
one after the other, they can be liquid or
air cooled.

Answer 8

In-Line

Question 9

The TDC is defined as when?

Answer 9

The piston is at the top of the stroke

Question 10

The next major breakthrough in piston engine development came in
____ when Dr. August Otto developed the FOUR – STROKE,
FIVE – EVENT CYCLE.

Answer 10

1876

Question 11

This engine always has odd number of cylinders

Answer 11

RADIAL ENGINE

Question 12

Many in-line engines are ______, so that the
crankshaft is at the top and pistons below.

Answer 12

Inverted

Question 13

Four stroke- Five event cycle is also known as?

Answer 13

Otto cycle

Question 14

gave a large frontal area to the aircraft, but was short in length.

Answer 14

Radial Engine

Question 15

The BDC is defined when?

Answer 15

The piston is at the bottom of the stroke

Question 16

These engines powered the
fighter aircraft of World War 2. Liquid cooled, the ____
arrangement of cylinders could easily be streamlined into the
fuselage so reducing drag.

Answer 16

V engines

Question 17

This arrangement makes a short rigid engine which is easily streamlines.

Answer 17

FLAT/HORIZONTALLY OPPOSED

Question 18

The first patent for heat engine was taken out in 1791 by ____ and was neither efficient nor practical

Answer 18

John Barber

Question 19

Exhaust Back Pressure happens at what stroke?

Answer 19

4th

Question 20

The propeller is
driven from the _______ and this arrangement gave greater
ground clearance for the propeller.

Answer 20

crankshaft

Question 21

The crankshaft rotates at ___ degrees as the piston moves from TDC to BDC

Answer 21

180

Question 22

In the 3rd Stroke, volume is unchanged due to?

Answer 22

Piston’s stationary position at TDC

Question 23

He built the first piston Engine which employed a battery ignition system and used a natural gas for fuel operated industrial machinery as lathers.

Answer 23

Etienne Leinor (1860)

Question 24

which force is directly related to the production of the aircraft’s acceleration?

Answer 24

Thrust

Question 25

When the piston is at TDC and at the end of the compression stroke:

Answer 25

Combustion takes place

Question 26

IF the crank - throw measures 5 inches, the stroke measurement is?

Answer 26

10

Question 27

Developed the four - Stroke, five - event cycle.

Answer 27

Dr. August Otto

Question 28

The drag which is present when the aircraft continues to climb is known as?

Answer 28

The undesirable but unavoidable bi - product of lift

Question 29

What could be the probable result of an exhaust back pressure?

Answer 29

The pressure in the cylinder increases slightly which causes the temperature to rise also

Question 30

Was used for larger more powerful engines of eight to twelve cylinders

Answer 30

V ENGINE

Question 31

What do you call the internal diameter of the cylinder?

Answer 31

Bore

Question 32

Constant volume happens in the system when;

Answer 32

Combustion takes place

Question 33

These have cylinders arranged in a straight line, one after the other, they can be liquid or air cooled.

Answer 33

INLINE ENGINE

Question 34

In 1483, Leonardo Da Vinci conceived a flying machine he called as?

Answer 34

Aerial screw

Question 35

which force is the resultant of the initial action force according to the coanda effect theory?

Answer 35

Lift

Question 36

What is the piston movement when both valves are closed and the cylinder volume is decreasing?

Answer 36

Piston is moving up

Question 37

An engine which has a bore equal to the stroke is known as ______

Answer 37

Over-square

Question 38

The complete cycle taking _____ (4 x 180)

Answer 38

720 degrees

Question 39

The inlet valve is open, permitting flow from atmosphere, through the carburetor into the cylinder. The piston is moving down and the cylinder volume is increasing. The cylinder pressure is decreasing below ambient. The charge temperature is decreasing. The mass of the charge is increasing.

Answer 39

1st stroke (induction)

Question 40

The _____ valve is now open to atmosphere. The piston moving up forces the exhaust gas past it to the atmosphere. The atmosphere provides a resistance to the flow of exhaust gas which is termed 'EXHAUST BACK PRESSURE'. Because of this the pressure in the cylinder increases slightly which causes the temperature to rise also.

Answer 40

4th stroke (Exhaust)

Question 41

The _____ is equal to Twice the Crankthrow.

Answer 41

Stroke

Question 42

When the piston is at TDC at the end of the compression stroke an electrical spark is produced at the spark plug, and ignites the fuel air mixture. It should be appreciated that this does not result in an explosion of the mixture, but is a controlled burning. This event is called ______.

Answer 42

Combustion

Question 43

The ______ is connected to a crankshaft.

Answer 43

Piston

Question 44

_____ and ______ are related to degrees of crankshaft movement, and position in relation to TDC and BDC

Answer 44

Piston and Valve Positions

Question 45

The Stroke is equal to ______

Answer 45

Twice the crankthrow

Question 46

Most modern light aircraft use four or six cylinder engines arranged in the _______ configuration. This arrangement makes for a short rigid engine, which is easily streamlined.

Answer 46

Flat/Horizontally opposed

Question 47

Both valves are still closed. The piston is stationary at the top of the stroke (TDC) the temperature of the charge is increasing rapidly during combustion. The VOLUME is unchanged due to the stationary piston, hence the internal combustion engine is known as a 'CONSTANT VOLUME ENGINE'. Pressure increases rapidly with the temperature increase. The piston is forced down by the pressure increase. The cylinder volume is therefore increasing. This means that cylinder pressure is decreasing, and as a function of that, the temperature decreases.

Answer 47

3rd stroke (power)

Question 48

In the otto cycle there are five events:

Answer 48

Induction, Compression, Combustion, Power, Exhaust

Question 49

The combustion process takes place with the piston at TDC. The volume in the cylinder at that moment in time is constant. Combustion is said to take place at _______.

Answer 49

constant volume

Question 50

Both of the valves are closed trapping the induced mixture in the cylinder. The piston is moving up. The cylinder pressure is increasing. The temperature of the charge is increasing. The mass of the charge is now fixed.

Answer 50

2nd stroke (compression)

Question 51

Types of Engine Layout

Answer 51

In-Line Engine, V engines, Radial engines, flat/horizontally opposed engines

Question 51

Layers of the Atmosphere

Answer 51

Troposphere, Stratosphere, Ionosphere, Exosphere

Question 51

Parts of the Otto Cycle

Answer 51

Induction, Compression, Combustion, Power, Exhaust.

Question 52

Parameters of Atmosphere

Answer 52

Pressure, Density, Temperature

Question 52

Different Theories of Lift/Flight

Answer 52

Bernoulli’s Principle, Newtons 3rd law of motion, Equal Transit theory, coanda effect theory