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Piston 1 - Review Questions Week 2 - pt.2

Calculate the compression ratio of the cylinder:

Volume of the cylinder with the piston @ BDC:  187 cubic inches.

Volume of the cylinder with the piston @ TDC:  31 cubic inches.

Please give answer to 1 decimal place.

6.0
3.8
5.6
In aviation what is the unit of Force (F)?
Watts
Lbs
N
Ft
Shaft Horsepower is defined as:
The power required to overcome the friction & energy losses in the engine
The total power developed in the engine's cylinder(s), ignoring friction losses
The power used up by friction and other losses in the engine
The actual amount of power delivered to the propeller shaft
What does a high performance piston aircraft use to control engine temperature?
Wing flaps
Cowl flaps
Fuel injection
Thermostat
Which of the following is an advantage of the horizontally opposed engine?
Highest power to weight
Good ground clearance
Lower vibration
Best cooling
And engine's best SFC (specific fuel consumption) will happen at what speed?
Approximately 85% of max rated power
Approximately 75% of max rated power
Approximately 75% of max rated engine speed
Approximately 75% of max rated aircraft speed
The goal of ignition timing is to:
Complete combustion with the result of having the lowest possible pressure in the cylinder just after TDC (top dead center)
Complete combustion with the result of having the maximum pressure in the cylinder just after TDC (top dead center)
Ignite the air/fuel with the result of having maximum power extraction competed by BDC (bottom dead center)
Achieve the highest possible fuel efficiency from the engine without leading to reliability problems
Which of the following can cause pre-ignition?
Excessive warm up time for the engine during ground operations
Poor cleaning practices on the cylinder assembly
Poor cleaning practices on the spark plugs
Failure to change the engine oil as frequently as specified
In aviation what is the unit of Torque (t)?
Ft-lbs/sec
N-m
Ft-lbs
M-s

Calculate the total displacement of the Continental IO550C six cylinder engine with the following dimensions:

A= Area of the piston head:  Piston radius is 2.5 inches

L= Length of the stroke: 5.0 inches

N= Number of cylinders of the engine (given above)

Please use 3.14 for Pi

Please give answer to the nearest whole number, no decimals.

589 CID
673 CID
458 CID
1014 CID

Lycoming 4 Cylinder engine

What cylinder is pointed to by "A"

1
2
3
4
In the following graph, what will be the fuel consumption of an engine at a cruise setting of 2625rpm?
82 lbs/hr
88 lbs/hr
151 lbs/hr
168 hp
7 cylinder radial, Which cylinder is pointed to by "G"
1
2
3
4
5
6
7
Which of the following is an advantage of the radial engine?
Simplicity
Easy cooling
Best air cooling
Low frontal area
In the following graph, what will be the fuel consumption of an engine at a cruise setting of 2475rpm?
130 lbs/hr
164 hp
65 lbs/hr
73 lbs/hr
What operational modifier does a GTSIO520NB engine have?
Supercharged using a mechanically driven blower
Supercharged using a exhaust driven compressor
Horizontally opposed
Inline
7 cylinder radial, Which cylinder is pointed to by "C"
1
2
3
4
5
6
7
Which of the following is an advantage of the horizontally opposed engine?
Good ground clearance
Highest power to weight
Relatively low frontal area
Best cooling
7 cylinder radial, Which cylinder is pointed to by "B"
1
2
3
4
5
6
7
What is mechanical efficiency?
The ratio of the amount of heat energy converted into useful work compared to the amount of energy contained in the fuel
The ratio of the volume of air/fuel that goes into the cylinders compared to the total piston displacement
The ratio of power developed in the cylinders to the power that reaches the propeller shaft
The ratio of the power developed in the cylinders to the amount of heat energy contained in the fuel

Lycoming 4 Cylinder engine

What cylinder is pointed to by "B"

1
2
3
4
In the following graph, what will be the fuel consumption of an engine at a cruise setting of 2375rpm?
64 lbs/hr
159 hp
115 lbs/hr
59 lbs/hr
What is required for the volumetric efficiency of an engine to be greater than 100%?
A supercharger
Adjustable ignition timing
Variable valve timing
A tuned exhaust
Which of the following can result in re-ignition?
Lower than normal grade aviation fuel being used
High speed & load engine operation
Early turning on of the ignition system by the pilot
Silica deposits on a spark plug

Continental 6 Cylinder engine

What cylinder is pointed at by "E"

1
2
3
4
5
6

Continental 4 Cylinder engine

What cylinder number is pointed to by "C"

1
2
3
4
 

Continental 6 Cylinder engine

What cylinder is pointed at by "F"

1
2
3
4
5
6
7 cylinder radial, Which cylinder is pointed to by "F"
1
2
3
4
5
6
7

Continental 4 Cylinder engine

What cylinder number is pointed to by "B"

1
2
3
4

Continental 6 Cylinder engine

What cylinder is pointed at by "D"

1
2
3
4
5
6
7 cylinder radial, Which cylinder is pointed to by "D"
1
2
3
4
5
6
7

 

Lycoming 6 Cylinder engine

What cylinder is pointed to by "C"?

1
2
3
4
5
6

Lycoming 6 Cylinder engine

What cylinder is pointed to by "E"?

1
2
3
4
5
6
7 cylinder radial, Which cylinder is pointed to by "E"
1
2
3
4
5
6
7

Lycoming 6 Cylinder engine

What cylinder is pointed to by "B"?

1
2
3
4
5
6

Continental 6 Cylinder engine

What cylinder is pointed at by "C"

1
2
3
4
5
6

Lycoming 6 Cylinder engine

What cylinder is pointed to by "A"?

1
2
3
4
5
6

Continental 6 Cylinder engine

What cylinder is pointed at by "B"

1
2
3
4
5
6
 

Continental 6 Cylinder engine

What cylinder is pointed at by "A"

1
2
3
4
5
6

Lycoming 6 Cylinder engine

What cylinder is pointed to by "F"?

1
2
3
4
5
6
In the following graph, what will be the fuel consumption of an engine in climb at 2300rpm?
87 lbs/hr
104 lbs/hr
79 lbs/hr
54 lbs/hr
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