Describe the three ways in which ball bearings are lubricated and how often each should be done.
What will be an ideal response?
The permanently lubricated bearings are sealed at the factory and only rarely require additional lubrication. The packed lubrication of ball bearings is done by hand; the bearing must be disassembled and hand packed with grease every two to five years. Many ball bearings are equipped with a grease fitting and should be lubricated every two years.
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Which soil test should be conducted on an undisturbed soil sample such as a large clump of soil, as soon as practicable after excavation?
a. plasticity b. thumb penetration c. pocket penetrometer d. sedimentation
Which of the following statements is false?
A. The term “gamma-phi” modeling refers to modeling the vapor-liquid equilibrium of a mixture by accounting for the non-idealities from the ideal solution model through an activity coefficient for the liquid and accounting for the non-idealities from an ideal gas through a fugacity coefficient for the vapor. B. The Poynting correction factor is used to account for the impact of pressure on the activity coefficient. C. The natural logarithm of the activity coefficient of a component in a mixture is a partial molar property of the excess molar Gibbs free energy of the mixture divided by RT. D. All of the above are true. E. All of the above are false.
Which is greater?
a. 1 inch b. 1 centimeter
To control the amount of metal buildup when performing flat fillet welds with FCAW, the welder should
_____. a. cool the practice coupon in water b. clean the weld with solvent c. increase or decrease the travel speed d. run the root pass with a 90-degree work angle