WorksheetsLubrication
Total questions: 25
Worksheet time: 25mins
Which one of them is a correct combination?
1-(i), 2-(iv), 3-(ii), 4-(iii).
2-(i), 3-(iv), 4-(iii), 1-(ii).
1-(iv), 3-(iii), 2-(i), 4-(ii).
3-(iv), 2-(iii), 1-(i), 4-(ii).
The purpose of lubrication is
To reduce friction.
Transfer heat produced.
To reduce wear.
All of above.
Which of the following is NOT a function of lubricant in IC engine?
Form a film to separate the surfaces.
Withstand high temperature inside the cylinder.
Adhere to surface.
Reduce the size of the asperities and improve the surface finish.
Synovial fluid is a lubricant that is found in
Human bone joints.
IC engines.
Gearboxes.
Rolling element bearings.
As the temperature is increased, the coefficient of friction
Increases.
Remains unchanged.
Reduces.
Increase or decrease based on the lubrication regime.
Which of the following is a desirable property of boundary lubricant?
Dissolvability in lubricating oils.
Low shear strength and high melting point.
Affinity to metallic surfaces.
All of above.
In hydrodynamic lubrication the major source of friction is
Shearing of lubricant film.
Abrasion of tribo-surfaces due to free particles.
Abrasion due to asperities on tribo-surfaces
All of the above.
Film thickness in elastohydrodynamic lubrication depends on
Applied load and relative velocity
Lubricant properties.
Properties of contacting materials
All of above.
What is the primary purpose of lubrication in machinery?
To reduce friction
To increase friction
To cool the machinery
To increase wear
Which of the following is a common lubricant used in engines?
Water
Graphite
Oil
Sand
In which type of lubrication does a full fluid film separate the surfaces?
Boundary lubrication
Mixed lubrication
Hydrodynamic lubrication
Dry lubrication
What property of a lubricant is crucial for its effectiveness in reducing friction?
High viscosity
Low viscosity
High density
Low density
Which of the following is NOT a function of a lubricant?
Cooling the surfaces
Reducing friction
Increasing wear
Preventing corrosion
What is the role of additives in lubricants?
To increase friction
To enhance lubricant properties
To decrease viscosity
To solidify the lubricant
Which of the following is a natural lubricant found in the human body?
Blood
Synovial fluid
Saliva
Sweat
What happens to the viscosity of oil as temperature increases?
It increases
It decreases
It remains constant
It solidifies
Which type of lubrication is used in high-load applications like gears?
Boundary lubrication
Hydrodynamic lubrication
Elastohydrodynamic lubrication
Dry lubrication
What is the effect of lubrication on energy consumption in machines?
Increases energy consumption
Decreases energy consumption
No effect
Varies randomly
Which of the following is a synthetic lubricant?
Water
Silicone oil
Graphite
Sand
What is the main disadvantage of using water as a lubricant?
High viscosity
Corrosive nature
High boiling point
Low density
Which of the following is a characteristic of a good lubricant?
High friction
High thermal stability
High reactivity
High volatility
What is the function of a lubricant in a ball bearing?
To increase friction
To reduce friction
To increase wear
To decrease load capacity
Which of the following is an example of solid lubrication?
Oil
Graphite
Water
Air
What is the effect of lubrication on the lifespan of machinery?
Decreases lifespan
Increases lifespan
No effect
Varies randomly
Which of the following is a common test for evaluating lubricant performance?
Viscosity test
Density test
Color test
Odor test
