chapter1b

31問 • 2年前

問題一覧

All heat engines convert __________ energy into __________ energy.

heat, mechanical

The two basic types of heat engines are

internal combustion, external combustion

The five events that must take place in an internal combustion engine to convert the chemical energy in fuel into mechanical energy are

intake, compression, ignition, power, exhaust

The Otto-cycle of engine operation is a constant ____________________ (volume or pressure) cycle.

volume

On which stroke of a four-stroke cycle engine does each of these events begin to occur? a. Intake valve opens b. Intake valve closes c. Exhaust valve opens d. Exhaust valve closes e. Ignition occurs

exhaust, compression, power, intake, compression

Valve overlap occurs at the end of the __________ stroke and the beginning of the __________ stroke.

exhaust, intake

The product of Force 3 Distance is known as ___________.

work

The rate of doing work is known as ____________________.

power

One horsepower is equal to __________ foot-pounds of work done in one minute, or __________ foot-pounds of work done in one second.

33,000, 550

The horsepower delivered to the propeller shaft of an aircraft engine is called __________ horsepower.

brake

The power required to rotate the engine and to compress the air is called __________ horsepower.

friction

Brake horsepower + friction horsepower = __________ horsepower.

indicated

A six-cylinder engine that turns at 2,600 rpm and has a bore of 4.0 inches, a stroke of 4.0 inches, and an IMEP of 120 psi will produce __________ horsepower.

118.69

A six-cylinder engine with a bore of 4.375 inches and a stroke of 5.125 inches has a piston displacement of __________ cubic inches.

462.25

A four-cylinder engine with a bore of 4.375 inches and a stroke of 3.875 inches has a piston displacement of __________ cubic inches.

233.02

The nominal weight of aviation gasoline is __________ pounds per gallon.

The nominal heat energy content of one pound of aviation gasoline is __________ Btu.

778

One British Thermal Unit of heat energy will perform __________ foot-pounds of work.

778

The thermal efficiency of an engine that burns 102 gallons of aviation gasoline per hour to produce 1,400 horsepower is __________ percent.

29.10

A normally aspirated aircraft engine typically __________ (can or cannot) attain a volumetric efficiency of 100%.

cannot

As the temperature of the air increases, the density ____________________ (increases or decreases).

decreases

The ratio of brake horsepower to indicated horsepower is the __________ efficiency of the engine.

mechanical

____________________ is the spontaneous combustion of the unburned charge ahead of the flame fronts after the ignition of the fuel/air charge in a reciprocating engine.

retonation

If a cylinder has a volume with the piston at the top of its stroke of 14.5 cubic inches and a piston displacement of 90 cubic inches, its compression ratio is __________:1.

7.21

If a cylinder has a volume with the piston at the top of its stroke of 23 cubic inches and a piston displacement of 131 cubic inches, its compression ratio is __________:1.

6.70

____________________ occurs when the fuel/air mixture ignites before the spark jumps across the terminals of the spark plug.

preignition

A serious loss of power and damage to exhaust valves in an aircraft engine can be caused by __________ (early or late) ignition timing.

late

In order to efficiently produce thrust, the tip speed of a propeller blade must not exceed ____________________.

the speed of sound

The two variables used by a pilot to control the amount of power an engine is producing are engine speed and cylinder pressure, indicated as __________ and ____________________ respectively.

RPM, manifold pressure

An engine that developes 180 brake horsepowerwith a brake specific fuel consumption of 0.47 will consume __________ gallons of aviation gasoline per hour.

14.1

A typical reciprocating aircraft engine converts only about __________% of the heat energy released into useful work.

CHAPTER 1A

Dorian Pinuellas · 53問 · 2年前

CHAPTER 1A