Powerplant Chapter 01 Flashcards

Reciprocating Engines

1
Q

What is the purpose of dynamic dampers on crankshafts?

A

They reduce engine vibration.

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2
Q

What types of bearings are generally found in reciprocating engines?

A

Plain, ball, and roller bearings.

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3
Q

Are the connecting rods used in each cylinder of a radial engine the same? Explain.

A

No. Radial engines use master and articulating rod assemblies.

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4
Q

Name the different types of piston rings.

A

Oil control, compression, and oil scraper.

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5
Q

Where should piston ring gaps be installed relative to each other, and why?

A

Compression ring gaps should be staggered so that they do not align. This prevents excessive blow-by.

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6
Q

What could result from incorrectly installed piston rings?

A

Excessive oil consumption.

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7
Q

What purpose do oil control rings serve?

A

They regulate the thickness of the oil film on the cylinder walls.

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8
Q

What is used to help prevent valve surge or floating in an aircraft engine?

A

Two or more springs are used on each valve.

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9
Q

On engines equipped with hydraulic valve lifters, what should the running valve clearance be?

A

Zero.

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10
Q

What is the purpose of valve overlap?

A

It allows better volumetric efficiency and lowers cylinder operating temperatures.

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