Maintenance Technician 2025 Complete Practice Test

The correct choice indicates that the journal bearing could be subjected to either high temperature or low speed, making the use of extreme pressure (EP) grease appropriate. EP greases are specially formulated to provide excellent lubrication under conditions of high load and extreme pressure while also being effective in high-temperature environments.

High temperatures can lead to accelerated wear and the breakdown of less robust lubricants, making EP grease a reliable choice for maintaining functionality and preventing failure. Similarly, for applications involving low-speed conditions, EP grease ensures sustained protection against wear due to potential oscillatory motion or heavy loads that might occur.

The alternative options do not correctly address the broader range of conditions where EP grease is advantageous. High speed could imply different lubrication needs, typically requiring lighter, less viscous oils to reduce drag and heat. Therefore, the use of EP grease is most suitable in situations involving high pressure and either high temperatures or low-speed applications, reinforcing why the right answer encompasses both A and B.