This type of seal is used for heavy machinery where some leakage is permissible.

a. packing
b. labyrinth seal
c. O-ring seal
d. felt or wool seal


b. labyrinth seal

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What is one advantage and one disadvantage of frequency control?

Fill in the blank(s) with the appropriate word(s).

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When a plunger type fuel transfer pump is used with HEUIs, what are typical charging pressure parameters?

A. 30-60 psi B. 75-110 psi C. 100-150 psi D. 150-320 psi

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In the female, meiosis results in the development of how many eggs?

a. 1 c. 3 b. 2 d. 4

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On an air cooled compressor, which of the following will wash lubricant from cylinder walls and cause piston wear allowing “blow-by” of vapor into the crankcase?

a. Slugging b. Flooding c. Starving d. Hemorrhaging

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