Define lubricants. Gives its types.

1 Answer

Answer :

Lubricant:- Any substance introduced between two moving or sliding surfaces to reduce the frictional resistance between them is known as a lubricant.

Types of Lubricant:-

i) Solid lubricant

ii) Semi-solid lubricant

iii) Liquid lubricant.

Related questions

Description : Define fuel. Give its types.

Last Answer : Fuel: A fuel can be defined as any combustible substance which during combustion gives large amount of heat energy. Types: 1) Solid Fuels 2) Liquid Fuels 3) Gaseous Fuels.

Description : Define corrosion. Give its types.

Last Answer : Corrosion: “Any process of chemical or electrochemical decay or destruction of a metal due to the action of surrounding medium is called as corrosion.” Types of corrosion: i) Atmospheric corrosion / Direct chemical / Dry corrosion ii) Immersed corrosion / Electrochemical corrosion / Wet corrosion

Description : Define lubricant. Give the classification of lubricants with at least one example of each type.

Last Answer : Lubricant: Any substance introduced between two moving or sliding surface to reduce the frictional resistance between them is known as lubricant. Classification: i) Solid lubricants: Examples: graphite, ... acids like oleic acid, Stearic acid etc., silicones, blended oils, and mineral oils.

Description : What are the types of lubricants ?

Last Answer : Lubricants can be classified as follows. Namely- (a) Mineral oil. (B) Animal and plant oils (c) Synthetic oils (d) Other liquids (e) Grease (f) Solid lubricants.

Description : How many types of lubricants according to the source ?

Last Answer : : According to the source, there are 2 types of lubricants. For example: animals and plants.

Description : Define following: i) Oiliness ii) Volatility iii) Cloud point iv)Pour point

Last Answer : i) Oiliness: -It is defined as the power of an oil to maintain a continuous film under pressure while used a lubricant. ii) Volatility: - Volatility of oil is its tendency to vaporize with the ... iv) Pour point: It is defined as the temperature at which oil ceases to flow or pour on cooling

Description : Define heat treatment of steel.

Last Answer : Heat treatment:- The process of heating steel to a certain high temperature and then cooling it at a controlled rate in order to develop certain physical properties without changing its chemical composition is known as heat treatment of steel.

Description : Pick out the correct combination about the role of various additives used in polymers. (A) Plasticiser: increases the polymer strength (B) Heat stabiliser: increases the maximum service ... property of polymer but increases its weight (D) Lubricants: increases the flexibility of polymers

Last Answer : Option C

Description : Explain how lubricants help in reducing friction?

Last Answer : Explain how lubricants help in reducing friction?

Description : What Designed to regulate temperature secrete lubricants and protect the body from harmful substances?

Last Answer : Epithelial tissues

Description : Volatile hydrocarbons are not used in the brakes of automobile as lubricants, but non-volatile hydrocarbons are used as lubricants.

Last Answer : Ans.: The vapour pressure of volatile hydrocarbons is very high and they get evaporated leaving behind the system. Due to this they are not used as lubricants in automobiles. Nonvolatile hydrocarbons having low vapour pressure are used as lubricants.

Description : The best lubricants for a machine working at high temperature & load is (A) Grease (B) Solid lubricant (C) Animal oils (D) Mineral oils

Last Answer : Option B

Description : Sun Petroleum Products departmentalizes by fuels, lubricants, and waxes and chemicals. This is an example of departmentalization by……….. (a) Product ; (b) Functions ; (c) Job design ; (d) Customer

Last Answer : (a) Product ;

Description : Write composition of steel. Explain its classification based on percentage of carbon.

Last Answer : Composition: Iron(Fe) - 98.5 to 99.95, Carbon(C) - 0.05 to 1.5 OR Steel consists Iron and Carbon Classification: 1) Mild or low carbon steel - (0.05-0.3%) - The variety of plain carbon ... - The variety of plane carbon steel, which consists of 0.6-1.5% of carbon, is known as high carbon steel.

Description : Explain following: i) Saponification ii) Emulsification.

Last Answer : i) Saponification:- It is the number of milligrams of KOH required to saponify 1 gm of oil.  A good lubricant should have moderate saponification value.  ii) Emulsification:- Certain oils have the ... in the refined form because in that case, the chances, of emulsion formation would be minimum. 

Description : Explain fluid - film lubrication with diagram.

Last Answer : Fluid film lubrication:  i) It is carried out by introducing the liquid lubricants in between the moving or sliding surface. The lubricant film covers the irregularities of the sliding or moving surface ... like watches, clocks, guns, sewing machines, scientific instrument etc.  Diagram

Description : Distinguish between Galvanizing and tinning. 

Last Answer : Galvanizing Tinning A process of covering iron or steel with a thin coat of Zinc to prevent it from rusting. A process of covering iron or steel with a thin coat of Tin to ... food stuff since Tin is nontoxic and protects the metal from corrosion and does not causes food poisoning.

Description : Explain metal cladding with labeled diagram.

Last Answer : Method : Metal cladding Process : i) Base metal is sandwiched or cladded between the two sheets of coating metal. ii) This sandwich is then passed through two heavy rollers maintained at high temp & ... Ni alloys, Cu & pb alloys & Pb alloys are used as cladding materials.

Description :  advantages and disadvantages of gaseous fuel.

Last Answer : Advantages:- 1) They have higher calorific value as compared to solid & liquid fuels. 2) They are easy to ignite & extinguish. 3) There combustion can readily controlled by the use of ... hence storage becomes costly. 4) They have very low ignition temp. Hence dangerous in storing & transporting

Description : Explain: i) Normalizing ii) Tempering

Last Answer : Normalizing:- It is similar to annealing. The process consists of heating the steel to a definite temperature about 500C above the critical temperature. Then it is allowed to cool freely in air. The cooling ... to a definite temperature (200 - 6000C) & then cooling it at a suitable rate.

Description : applications of bio-diesel

Last Answer : 1. It is an alternative fuel formulated exclusively for diesel engines with little or no modification in engines. 2. It is also used as a heating fuel in domestic & commercial boilers. 3. It is used in rocket fuels.

Description : characteristics of good fuel.

Last Answer : 1) It should have moderate ignition temperature. 2) It should have high calorific value. 3) It should possess moderate velocity of combustion. 4) It should have low contents of non-combustible ... 10) It should not undergo spontaneous combustion. 11) It should burn in air with efficiency.

Description : functions of extenders. 

Last Answer : Function of extenders:- 1) They reduce the cost of paint. 2) They increase durability of paint 3) They help to reduce the cracking of dry paint. 4) They acts as carriers for pigmented colour.

Description : Give reason galvanized containers are not used for storing food stuffs.

Last Answer : Galvanized container contains zinc coating. Since Zn is more active metal it readily reacts with the acids present in the food stuffs forming Zn compounds which are highly poisonous & it may poison the food stuffs. Therefore galvanized containers can not be used for storing food stuff.

Description : Name the metal oxide film which is more protective. Explain.

Last Answer : Stable -non - porous oxide film.  Explanation: Metals like Al forms Al2O3 whose volume is greater than the volume of metal (Al). An extremely tightly adhering, non- porous oxide layers is ... it forms a barrier for further action and hence the rate of oxidation of metal rapidly decreases.