Millwright – Lubrication Exam | Questions with 100% Correct Answers | Updated & Verified |, Exams of Hydraulic Structures and Machines

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Millwright – Lubrication Exam | Questions with

100% Correct Answers | Updated & Verified |

1. What type of oil or grease would be used in a heavy load situation? a. Synthetic oil b. Extreme pressure lubricant c. Mineral oil d. Any hydraulic fluid ✔✔b. Extreme pressure lubricant
2. The most common measurement of kinematic viscosity is what? a. Viscosity b. Centistokes c. Viscosity index d. Flash point ✔✔b. Centistokes
3. When grease moves in a bearing, it tends to shear. This is known as: a. Pour point b. Viscosity index c. Directional fluidity

d. Shear point ✔✔c. Directional fluidity

4. What type of lubricant is used under shock load conditions? a. Light oil b. EP lubricant c. Extra pressure lubricant d. Synthetic oils ✔✔b. EP lubricant
5. Viscosity is defined as which of the following? a. Lubricant is thick b. Measurement of a fluid's resistance to flow c. Measure of a lubricants heat capacity d. The lowest temperature an oil will flow ✔✔b. Measurement of a fluid's resistance to flow
6. A grease lubricant soluble in water is which of the following? a. Sodium b. Lithium c. Magnesium d. All oils and grease are soluble in water ✔✔a. Sodium

a. It keeps the internal parts of a system clean b. It improves viscosity c. It helps lubricate cylinder wipers d. It improves filtration if you have used to large of a filter ✔✔a. It keeps the internal parts of a system clean

11. What is aeration in reference to oils? a. When oil is air entrained b. When oil has oxygen bubbles added by the manufacturer c. When the oil is boiling d. When EP oil cools down ✔✔a. When oil is air entrained
12. How much pressure does the weight of 1 cubic foot of oil generate? a. 1 psi b. 4 psi c. 14 psi d. 0.4 psi ✔✔d. 0.4 psi
13. What is laminar flow? a. Oil flowing in circles

b. Oil flowing in a smooth flow pattern c. Oil that has detergent added d. Oil moving in an erratic fashion ✔✔b. Oil flowing in a smooth flow pattern

14. What is Bernoulli's principal? a. If flow is constant, the sum of kinetic and potential energy is constant b. Pressure applied to a fluid at rest will result in even pressure at right angles to the containing surface c. Energy cannot be created or destroyed, but may change form d. Oil can change flow rate, based on temperature ✔✔a. If flow is constant, the sum of kinetic and potential energy is constant
15. What are the three types of friction? a. Fluid, scraping, rolling b. Sliding, pulling, pushing c. Rolling, pulling, pushing d. Fluid, rolling, sliding ✔✔d. Fluid, rolling, sliding
16. What is mist lubrication used for? a. High speed bearings and high velocity roller chain b. Internal pump parts

20. What is the best lubrication condition? a. Splash b. Mist c. Oil and grease d. Full film ✔✔d. Full film
21. What type of gear oil is used for high heat and heavy loads? a. Lithium b. H 32 hydraulic oil c. Sodium d. EP ✔✔d. EP
22. What type of lubricant to use if gears in a gearbox are wearing? a. EP Grease b. Low viscosity airline oil c. EP oil d. White Lithium ✔✔c. EP oil
23. What type of testing is performed on oil to check for metallic contaminants?

a. Spectograph b. Magnetic test c. Flash point analysis d. continuity ✔✔a. Spectograph