When choosing a lubricant, high loads coupled with high speeds require _____.

a. only high-viscosity lubricants be used
b. only low-viscosity lubricants be used
c. only naphthenic lubricants be used
d. particularly careful thought and research to make the proper choice


d. particularly careful thought and research to make the proper choice

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On a rebuilt engine with relatively low mileage, oil leakage past the valve guide seals is a more likely cause of oil consumption than leakage past piston rings.

Answer the following statement true (T) or false (F)

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Every year the U.S. exports almost ______% more agricultural goods than are imported

a. 30 c. 70 b. 50 d. 90

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Technician A says that all electric motors are DC motors. Technician B says that two types of brushless motors use AC current. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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Adding a little extra refrigerant over the amount recommended by the manufacturer

A) Reduces system capacity but slightly increases system efficiency B) Increases system capacity slightly but reduces system efficiency? C) Does not affect system capacity or efficiency, but provides a buffer against future refrigerant loss and nuisance call backs D) Reduces both system capacity and efficiency

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