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Propulsions > Exam 1 Questions > Flashcards

Exam 1 Questions Flashcards

1
Q

The type of engine selected for an aircraft generally depends largely on?

A

Aircraft’s Cruising Speed

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2
Q

Generally, the more cylinders an engine has _____?

A

The more power it can produce

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3
Q

An aircraft engine must be designed to run at _____% power most of the time

A

65% - 75%

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4
Q

The first engine to convert steam into mechanical power was the ______?

A

Aeolipile

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5
Q

The “cycle” of a reciprocating engine is called the _______ cycle.

A

Otto

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6
Q

A big advantage of a radial engine is that they are very _______.

A

Resistant to damage

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7
Q

Select the engine that has the highest horsepower-to-weight ratio.

Inline
Opposed
V-type
Radial

A

Radial

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8
Q

Which selection below does not belong in a list of how aircraft engines are classified

Turbo-charging
Cooling Method
Cylinder Arrangment
Displacement

A

Turbo-charging

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9
Q

Displacement of an engine is?

A

The total amount of gases displaced by the piston during a stroke, expressed in cubic inches

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10
Q

The component which transforms the reciprocating motion of the piston and connecting rod into rotary motion for turning the propeller is?

A

Crankshaft

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11
Q

The component between the piston and the crankshaft

A

Connecting Rod

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12
Q

An engine that uses a master and articulating rods would be a ______ engine.

A

Radial

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13
Q

The engine part designed to keep the fuel/air charge in the combustion chamber is a ______?

A

Compression Ring

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14
Q

Match the type of bearing with its designed use. (Radial Loads, Thrust Loads, Radial and Thrust Loads)

Plain Bearing
Ball Bearing
Roller Bearing

A

Plain Bearing > Radial Loads
Ball Bearing > Thrust Loads
Roller Bearing > Radial and Thrust Loads

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15
Q

The purpose of an oil ring on a piston is to prevent gases from escaping past the piston during the compression stroke. T or F?

A

False

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16
Q

Boyle’s Law

A

Direct relation between pressure and temperature. As pressure increases, temperature will also increase proportionally.

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17
Q

Charle’s Law

A

Inverse relation between pressure and volume. As pressure increase volume decreases. As volume decreases, pressure increases.

18
Q

The distance a piston moves from BDC to TDC is the _______.

A

Stroke

19
Q

The part of an engine that holds the valves and valve operating mechanism, also forms the ______.

A

Combustion Chamber

20
Q

The component that houses the reciprocating parts and is considered to be the “foundation of the engine” is the _________.

A

Crankcase

21
Q

Select the type of Connecting Rod used by a Radial Engine.

A

Master and Articulated

22
Q

What component is considered to be the “backbone” of the internal-combustion engine?

A

Crankshaft

23
Q

These are used on a Crankshaft to relieve the whipping and vibration caused by the rotation.

A

Dynamic Dampers

24
Q

The type of propeller shaft for low powered aircraft and that is integral to the crankshaft (actually a part of it)

A

Tapered

25
Q

The device on a piston that prevents fuel-air mixture from escaping the combustion chamber.

A

Compression Ring

26
Q

The component that conducts heat away from the piston to the piston walls is ________?

A

Piston Rings

27
Q

The part of the engine that forms the combustion chamber is the _________?

A

Cylinder Head

28
Q

Device within the engine that controls or regulates the direction of flow of a fluid or gas is a _________?

A

Valve

29
Q

The opening into the combustion chamber of a reciprocating engine is a ________?

A

Port

30
Q

Component that holds a valve closed

A

Valve spring

31
Q

Engine component that actuates the valve operating mechanism is the ________?

A

Camshaft

32
Q

The camshaft is turned by the?

A

Crankshaft

33
Q

Match the component with the correct description of its function. (Power or not power producing)

Crankshaft
Valves
Cylinder Head
Connecting Rod
Camshaft
Piston
Cylinder

A

Crankshaft (Power producing)
Valves (Not power producing)
Cylinder Head (Not Power producing)
Connecting Rod (Power Producing)
Camshaft (Not power producing)
Piston (Power Producing)
Cylinder (Power Producing)

34
Q

Volumetric Efficiency

A

The ratio of the volume of the fuel-air charge burned by the engine at atmospheric pressure and temperature to the piston displacement.

35
Q

Thermal Efficiency

A

The ratio of the heat energy converted into useful work to the heat energy contained in the fuel

36
Q

Mechanical Efficiency

A

The ratio of BHP to IHP, showing the percentage of power developed in the cylinders that actually reaches the propeller shaft

37
Q

The crankshaft rotates 360 degrees for each stroke of the engine. T or F?

A

False

38
Q

At what point in the operating cycle of an engine does ignition take place?

A

Just before TDC

39
Q

The ___________________________ of an engine is the ratio of the volume of space in the cylinders when the piston is at the bottom of its stroke to the volume when the piston is at the top of its stroke.

A

Compression Ratio

40
Q

Which engine efficiency is increased by valve overlap?

A

Volumetric

41
Q

_______ is the horsepower developed by the ending, that is, the total horsepower converted from heat energy to mechanical energy.

A

IHP

42
Q

__________ is the actual horsepower delivered by an engine to a propeller or other driven device. It is IHP minus the friction horsepower.

A

BHP

Propulsions (4 decks)

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