Deck 1

Question 1

What is the primary use of the fork-and-blade rod assembly?

Answer 1

Used primarily in V-type engines

Question 2

What does the fork-and-blade rod assembly consist of?

Answer 2

A fork connecting rod and a blade connecting rod

Question 3

What is the purpose of the split at the crankpin end of the forked rod?

Answer 3

To allow space for the blade rod to fit between the prongs

Question 4

What is the primary function of pistons in a reciprocating engine?

Answer 4

Draw fuel and air into a cylinder, compress the gases, and purge burned exhaust gases

Question 5

What are the four parts of a piston?

Answer 5

• Piston head
• Ring grooves
• Piston pin boss
• Piston skirt

Question 6

What is the function of piston rings?

Answer 6

Prevent leakage of gas pressure, reduce oil seepage, and transfer heat from the piston to the cylinder walls

Question 7

What type of engine commonly uses the master-and-articulated rod assembly?

Answer 7

Radial engines

Question 8

How many master rods and articulated rods are present in a nine-cylinder radial engine?

Answer 8

One master rod and eight articulated rods

Question 9

What is the purpose of a plain connecting rod’s bronze bushing?

Answer 9

To accommodate the piston pin

Question 10

What is the primary function of a crankcase in a reciprocating engine?

Answer 10

Provides tight enclosure for the lubricating oil and contains the engine’s integral parts

Question 11

What is the backbone of a reciprocating engine?

Answer 11

Crankshaft

Question 12

What are the main components of a crankshaft?

Answer 12

• Main bearing journal
• Crankpins
• Crank cheeks

Question 13

What is the role of connecting rods in an engine?

Answer 13

Transmit the force exerted on a piston to a crankshaft

Question 14

What are the basic components of a reciprocating engine?

Answer 14

• Crankcase
• Cylinders
• Pistons
• Connecting rods
• Valves
• Spark plugs
• Crankshaft

Question 15

What is the point called where a piston ring is split?

Answer 15

Piston ring gap

Question 16

What is the primary purpose of oil control rings?

Answer 16

Regulate the thickness of the oil film on the cylinder wall

Question 17

Fill in the blank: The _______ is a circular ring of hardened metal that provides a uniform sealing surface for the valve face.

Answer 17

valve seat

Question 18

What prevents valve float in an engine?

Answer 18

Using two or more valve springs of different sizes and diameters

Question 19

What is the function of the valve stem?

Answer 19

Keeps the valve head properly aligned as it moves

Question 20

What type of piston pin is free to rotate in both the connecting rod and the piston?

Answer 20

Full-floating piston pins

Question 21

What do cylinders provide in an engine?

Answer 21

A combustion chamber where burning and expansion of gases takes place to produce power

Question 22

What materials are commonly used for cylinder heads?

Answer 22

Forged or die-cast aluminum alloy

Question 23

What are the four basic designs of poppet valves?

Answer 23

• Flat-headed valve
• Semi-tulip valve
• Tulip valve
• Mushroom valve

Question 24

What are the four basic designs of poppet valves?

Answer 24

Flat-headed valve, semi-tulip valve, tulip valve, mushroom valve

These designs differ in shape and application, particularly in aircraft engines.

Question 25

What is a flat-headed valve typically used for?

Answer 25

Only as an intake valve in aircraft engines ## Footnote It is characterized by its flat head design.

Question 26

Describe the head shape of a semi-tulip valve.

Answer 26

Slightly concave area on its head ## Footnote This design allows for certain performance characteristics in engine applications.

Question 27

What distinguishes a tulip valve from other types of valves?

Answer 27

Deep, wide indented area on its head ## Footnote This design is often used for its aerodynamic properties.

Question 28

What is unique about mushroom valves?

Answer 28

They have convex heads and are not commonly found on aircraft engines ## Footnote Their design may be suitable for other applications.

Question 29

What are cylinder barrels typically machined from?

Answer 29

A forged blank ## Footnote This process ensures strength and durability.

Question 30

What is the purpose of the skirt on a cylinder barrel?

Answer 30

Projects into the crankcase ## Footnote It helps in the assembly and functioning of the engine.

Question 31

What is the function of the mounting flange on a cylinder barrel?

Answer 31

Used to attach the cylinder to the crankcase ## Footnote This provides structural support and alignment.

Question 32

What are cooling fins on a cylinder barrel?

Answer 32

Several thin cooling fins machined into the exterior cylinder wall ## Footnote They help dissipate heat during engine operation.

Question 33

What is the cylinder bore?

Answer 33

The inside of a cylinder ## Footnote It is machined smooth and may be honed to a final dimension.

Question 34

What is a choke bore cylinder?

Answer 34

A cylinder bore machined with a slight taper ## Footnote The diameter at the top portion is slightly smaller than at the skirt.

Question 35

What is the purpose of a choke bore cylinder?

Answer 35

To compensate for uneven expansion caused by higher operating temperatures and larger mass near the cylinder head ## Footnote This design helps maintain performance and efficiency.

Question 36

Fill in the blank: The exterior of a cylinder barrel consists of several thin _______.

Answer 36

cooling fins ## Footnote These fins are essential for heat management in engines.

Question 37

True or False: Mushroom valves are commonly used in aircraft engines.

Answer 37

False ## Footnote Their convex design is not suited for this application.