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

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

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

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"

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

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

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

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"

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 4 Cylinder engine

What cylinder number is pointed to by "C"

Continental 4 Cylinder engine

What cylinder number is pointed to by "B"

Piston 1 - Review Questions Week 2 - pt.2

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