6001-Lubrication Principles
Antifoam additives are added to an oil to cause a large collapse of vapour bubbles within the oil. A - True B - False
A
The temperature at which an oil will give off enough vapours to momentarily ignite in the presence of air and an ignition source is called the flashpoint. A - True B - False
A
The temperature at which an oil will give off enough vapours to momentarily ignite in the presence of air and an ignition source is called the flashpoint. A: True B: False
A
Which statement about flash point is true? A - This is the temperature at which the oil will give sufficient vapour to ignite B - This indicates the acidity of an oil C - This is the temperature at which the wax in the oil separates out D - This is a measure of the resistance of a liquid to shear
A
Which statement about pour point is true? A - This is the lowest temperature at which the oil will flow B - This is a measure of the resistance of a liquid to shear C - This indicates the acidity of an oil D - This is the measurement of the change in viscosity of oils as temperatures change
A
Freon is miscible with oil, while ammonia is not, therefore, a lower viscosity oil must be used in a Freon refrigeration system than in an ammonia system. A - True B - False
B
Which characteristic best describes aluminum based grease? A - Water soluble B - Very sticky C - Used as an axle grease D - Designed for high temperature use E - Base contains sodium and calcium
B
Which statement about neutralization number is true? A - This is the measurement of the change in viscosity of oils as temperatures change B - This indicates the acidity of an oil C - This is the lowest temperature at which the oil will flow D - This is a measure of the resistance of a liquid to shear
B
Which statement about viscosity index is true? A - This indicates the acidity of an oil B - This is the measurement of the change in viscosity of oils as temperatures change C - This is the lowest temperature at which the oil will flow D - This is a measure of the resistance of a liquid to shear
B
Which statement about viscosity is true? A - This is the lowest temperature at which the oil will flow B - This is a measure of the resistance of a liquid to shear C - This is the measurement of the change in viscosity of oils as temperatures change D - This indicates the acidity of an oil
B
The fire point of an oil is the temperature at which: A - The oil will give off sufficient vapour to ignite momentarily B - The oil will flow C - Enough vapour is given off for the oil to burn continuously D - The oil spontaneously solidifies and ignites
C
The neutralization number of an oil indicates its: A - Viscosity B - Pour point C - Acidity D - Floc point
C
The viscosity index is a measurement of: A - The acidity of an oil B - The resistance of a liquid to internal deformation or shear C - How much an oils viscosity changes as temperatures change D - The lowest temperature at which the oil will flow
C
Which characteristic best describes sodium based grease? A - Base contains sodium and calcium B - Used as an axle grease C - Water soluble D - Designed for high temperature use E - Very sticky
C
Why must the oil used in refrigeration compressors have a low pour point? A - To allow the oil to congeal at evaporator temperatures B - To prevent the oil from congealing at boiler temperatures C - To prevent the oil from congealing at evaporator temperatures D - To allow the oil to congeal at boiler temperatures
C
In the case of enclosed gears, such as turbine reduction gears: A - An oil that provides a good seal is preferred B - A high viscosity oil is preferred C - The oil must be within a suitable range at the operating temperatures of the compressor D - A low viscosity oil is preferred
D
Liquid lubricants are divided into three general classes. They are: A - Gear, cylinder, and compressor oils B - Sodium based, aluminum based, and specialty oils C - Viscous, semi-viscous, and highly viscous D - Synthetic, mineral, and fixed oils
D
Solid lubricants are used: A - To lubricate all bearings regardless of size or location B - Only in sealed bearings C - Under conditions of light load D - Under conditions of high load or extreme (high or low) temperatures
D
The lubricating oil used in air compressor cylinders must have the proper _________ and be low in ____________. A antioxidant additives; rust preventatives B carbon residue; viscosity C rust preventatives; antioxidant additives D viscosity; carbon residue
D
The oil used in a turbine circulating system should: A - Cling to the surfaces and resist washing off B - Must not react chemically with the refrigerant C - Be suitable for both bearing and cylinder lubrication D - Incorporate corrosion inhibitors, antifoam and anti-oxidant additives
D
The temperature at which grease changes from a semi-solid to a liquid is called the: A - Pour point B - Melting point C - Dripping point D - Dropping point
D
Which characteristic best describes barium and lithium based grease? A Base contains sodium and calcium B Water soluble C Very sticky D Designed for high temperature use E Used as an axle grease
D
Which characteristic best describes calcium based grease? A - Water soluble B - Designed for high temperature use C - Base contains sodium and calcium D - Used as an axle grease E - Very sticky
D
Which characteristic best describes mixed based grease? A - Used as an axle grease B - Water soluble C - Designed for high temperature use D - Very sticky E - Base contains sodium and calcium
E
