4th Class Power Engineering Unit B1: Lubrication and Bearings Exam Questions With Complete Solutions

4th Class Power Engineering Unit B1: Lubrication and Bearings Exam Questions With Complete Solutions /.If an oil's viscosity changes a lot with little temperature change then it will have? Select one: a. low viscosity index b. high pour point c. high carbon residue d. high viscosity index /.Besides physically removing heat from a component, how does oil reduce the heat in a bearing?: Select one: a. it reduces the specific heat of the air in the bearing housing b. it reduces wear c. it increases the heat transfer d. it reduces friction /.Of the following, which is NOT a function of the oil in a steam turbine oil system? Select one: a. governor control system fluid b. heat removal c. pour point suppression d. friction reduction /.The intermeshing of gear teeth is a place where Select one: a. temperature control is very important b. friction reduction is very important c. sealing is very important d. shock absorption is very important /.If a lubricant oil has a high viscosity index number, this means it will: Select one: a. change a great deal with temperature change b. not change at all with temperature increase c. vaporize with temperature increase d. change little with temperature change /.If a piece of machinery were particularity difficult to reach and service, what type of lubricant would be useful?: Select one: a. an oil b. a grease c. a solid lubricant d. a grease stick /.What type of oil do open gears require?: Select one: a. high viscosity oil b. semi-solid oil c. oil with a low pour point d. low viscosity oil /.The separation of two surfaces, which is brought about by an interposing liquid, is called Select one: a. lubrication b. viscosity index c. floc point d. oil flooding /.Which class of liquid lubricant is not often used on its own?: Select one: a. mineral oils b. synthetic oils c. fixed oils d. mixed base oils /.Fixed oils are also known as: Select one: a. synthetic oils b. fatty oils c. mineral oils d. rock oils /.The type of grease used for heavily loaded machinery operating at slow speeds is: Select one: a. sodium base grease b. specialty grease c. mixed base grease d. calcium base grease /.Air compressor oil should: Select one: a. have a very low viscosity b. have low carbon residue c. have a low flash point d. not contain anti-oxidants /.An oil with a low viscosity index: Select one: a. is a very thin oil, which does not change viscosity with temperature change b. is a very thick oil, which does not change viscosity with temperature change c. goes through a large change in viscosity when subject to temperature change. d. goes through a small change in viscosity when subject to temperature change. /.The most common and cheapest greases are not suitable for: Select one: a. temperatures above 70°C b. sealing dirt from bearings c. applications where they must stay in place d. applications where the components are infrequently lubricated /.At elevated temperatures oil can evaporate, which causes it to: Select one: a. separate b. thicken c. burn d. corrode /.Which class of liquid lubricant is most commonly used?: Select one: a. plant-based oils b. multi-purpose greases c. animal-based oils d. mineral oils /.A material which is commonly used as a solid lubricant is: Select one: a. tallow b. wax c. lime d. molybdenum disulphide /.Aluminum based greases canʼt be used in high speed applications because: Select one: a. they remove too much heat b. they tend to soften and melt c. they have high internal friction d. they donʼt stick well to components - Answer-c