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TSSA 4th class B Test With Complete Solution
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TSSA 4th class B Test WithComplete Solution
Unit 1 Lubrication and bearings - Answer
Large journal or sleeve bearings have grooves:
Select one:
a. In the non-pressure area
b. For distributing lubricant evenly just after the pressure area
c. Cut into the bearing housing
d. In the high pressure area of the bearing babbit - Answer In the non-pressure area
A normal anti-friction bearing temperature operating range is:
Select one:
a. 80°C to 120°C
b. 20°C to 50°C
c. 65°C to 70°C
d. 150°C to 160°C - Answer 65°C to 70°C
A collar thrust bearing:
Select one:
a. Has boundary lubrication
b. Is used with steam turbines only
c. Is an anti-friction type bearing
d. Can support more load than a Michell thrust bearing - Answer a. Has boundary
lubrication
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
,c. Molybdenum disulfide
d. Sodium carbonate - Answer c. Molybdenum disulfide
Lubricants used for high-output steam turbines should:
Select one:
a. Mix well with water
b. Have a low pour point
c. Be fire resistant
d. Have a very high viscosity - Answer c. Be fire resistant
All semi-solid lubricants:
Select one:
a. Have a low viscosity
b. Are capable of sealing out dirt and water from bearings
c. Contain graphite
d. Resist moisture - Answer b. Are capable of sealing out dirt and water from bearings
Which of the following has the greatest effect on the viscosity of lubrication oil?
Select one:
a. Pressure
b. Load
c. Temperature
d. Speed - Answer c. Temperature
Applying installation forces through the balls of a bearing can cause:
Select one:
a. Brinelling
b. Cracking or breaking of the balls
c. too large an air gap
d. Bearing misalignment - Answer a. Brinelling
If an oil must flow at a very low temperature[comma] it must have the following additive:
,Select one:
a. Viscosity index improver
b. Pour point depressant
c. Dispersant
d. Floc point improver - Answer b. Pour point depressant
The oil for a refrigeration compressor must:
Select one:
a. Be a multi-grade type
b. Have a high fire point
c. Have a high flash point
d. Have a low pour point - Answer d. Have a low pour point
The characteristics of a grease are determined by:
Select one:
a. Its thickening agent or €œsoap€
b. Its consistency
c. The type of oil used in the grease
d. Its protective coating - Answer a. Its thickening agent or €œsoap€
If ambient air temperatures are very low[comma] the preferred lubricant is a:
Select one:
a. Solid
b. Semi-solid
c. Fixed oil
d. Liquid - Answer a. Solid
A common cause of antifriction bearing failure is:
Select one:
a. Shaft misalignment
b. Drive motor overload
, c. Extreme cold temperature cracking
d. High RPM service - Answer a. Shaft misalignment
The cheapest and most commonly used grease is:
Select one:
a. Sulphate base
b. Lime base
c. Chlorine base
d. Potassium base - Answer b. Lime base
A form of lubrication that requires continual motion of a shaft or surface is:
Select one:
a. Fluid film lubrication
b. Forced lubrication
c. Continuous lubrication
d. Boundary lubrication - Answer a. Fluid film lubrication
The ability of an oil to lift and support heavy loads depends upon:
Select one:
a. Pour point
b. acceleration
c. Hydraulic pressure
d. kinetic energy - Answer c. Hydraulic pressure
A thrust bearing which does not utilize the oil wedge principle of lubrication is the:
Select one:
a. Kingsbury type
b. Radial type
c. Collar type
d. Michell type - Answer c. Collar type
A type of anti-friction bearing is the _____ .
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