15 Questions
What are the functions of lubricants?
Functions of lubricants include reducing frictional resistance, minimizing wear and tear on moving parts, and dissipating heat.
What are the mechanisms of lubrication?
The mechanisms of lubrication include thick film, thin film, and extreme pressure lubrication.
What are the classifications of lubricants?
Lubricants can be classified as solid lubricants (such as graphite and molybdenum disulphide), semi-solid lubricants (greases), and liquid lubricants (such as animal/vegetable oil and blended oils).
What are some properties of lubricants?
Properties of lubricants include viscosity, viscosity index, flash and fire point, cloud and pour point, acid value, and saponification value.
How do lubricants minimize the ill effects of frictional resistance?
Lubricants minimize the ill effects of frictional resistance by forming a thin layer between moving or sliding parts, reducing wear and tear, and dissipating energy in the form of heat.
What is the prerequisite for Module 3?
Definition of Lubricants and Lubrication Functions
What are the functions of lubricants?
To minimize wear and tear on moving parts and dissipate heat
What are the three mechanisms of lubrication mentioned in the text?
Thick Film, Thin Film, Extreme Pressure
What are the three classifications of lubricants mentioned in the text?
Solid lubricants, semi-solid lubricants, liquid lubricants
How can the ill effects of frictional resistance be minimized?
By using a suitable substance that forms a thin layer between moving parts
What are the steps involved in domestic water treatment?
Screening, sedimentation, filtration, disinfection (chlorination, treatment with ozone)
What are the specifications of water for drinking purposes?
Clear (colorless), odourless, pleasant taste, optimum hardness of 100 ppm, pH of 7.0 to 8.5, total dissolved solids (TDS) not exceeding 500 ppm, turbidity not exceeding 25 ppm, and free from contaminants
What are the methods for desalination of brackish water?
Reverse Osmosis, Electrodialysis, Ultrafiltration
What are BOD and COD in sewage water treatment?
BOD stands for Biochemical Oxygen Demand and COD stands for Chemical Oxygen Demand. They are used to measure the amount of oxygen required for the biological and chemical processes in water treatment, respectively.
What is the activated sludge process in sewage water treatment?
It is a secondary treatment process where microorganisms are used to break down organic matter in the sewage water.
Study Notes
Functions of Lubricants
- Reduce friction between two surfaces in contact
- Prevent wear and tear on machinery
- Reduce heat generation
- Prevent corrosion and rust
- Improve efficiency of machinery
- Reduce energy consumption
Mechanisms of Lubrication
- Hydrodynamic lubrication: formation of a thin film of lubricant between two surfaces
- Elastohydrodynamic lubrication: combines hydrodynamic and elastic properties of lubricant
- Boundary lubrication: lubricant forms a thin film on the surface of metals
Classifications of Lubricants
- Mineral-based lubricants: derived from petroleum products
- Synthetic lubricants: man-made chemical compounds
- Bio-based lubricants: derived from animal or plant sources
Properties of Lubricants
- Viscosity: measures resistance to flow
- Density: mass per unit volume
- Flash point: temperature at which lubricant ignites
- Pour point: temperature at which lubricant becomes semi-solid
Minimizing Frictional Resistance
- Reduce frictional force between two surfaces
- Reduce heat generation
- Increase efficiency of machinery
- Reduce energy consumption
- Prevent wear and tear on machinery
Test your knowledge of lubricants with this quiz on the definition, functions, mechanisms, and classifications of lubricants. Explore solid lubricants like graphite and molybdenum disulphide, semi-solid lubricants such as greases, and liquid lubricants including animal/vegetable oil and blended oils. Dive into the properties of lubricants for special applications and enhance your understanding of this essential aspect of machinery maintenance.
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