172 + Interview Questions in Lubricants in Applied Chemistry Page 4 InterviewSolution

151.	Lithium soap greases are __________(a) temperature resistant(b) fire resistant(c) water resistant(d) pressure resistantI got this question during an online exam.This key question is from Classification of Lubricants in portion Lubricants of Applied Chemistry
Answer» CORRECT OPTION is (C) water resistant The explanation is: LITHIUM soap greases are the water resistant as they have combined advantages of the both calcium base greases and sodium base greases. They can be used at high temperatures. These properties of these lubricants are responsible for their USE in wide range.

Discussion

152.	99% of grease is produced from __________(a) petroleum oil(b) olive oil(c) castor oil(d) whale oilI have been asked this question during an interview for a job.The doubt is from Classification of Lubricants topic in chapter Lubricants of Applied Chemistry
Answer» The correct CHOICE is (a) petroleum oil The EXPLANATION is: The semi-solid LUBRICANTS are generally made by incorporation of the lubricating oil with metallic SOAP to the liquid lubricants. 99% of the grease is produced from the petroleum oil. Olive oil, castor oil and WHALE oil are the types of liquid lubricants.

Discussion

153.	Insulators making rubbing contact require _______(a) Low conductivity(b) High conductivity(c) Low pressure(d) High pressureThis question was posed to me by my school teacher while I was bunking the class.This interesting question is from Classification of Lubricants in division Lubricants of Applied Chemistry
Answer» Right option is (a) LOW conductivity The BEST I can explain: Insulators making rubber contact NEEDED low ELECTRICAL conductivity. In some other applications of the solid LUBRICANTS, the high electrical conductivities. Sliding electric contact requires high electrical conductivity.

Discussion

154.	Mobility of the solid lubricants on the adsorbents promotes ___________(a) Self-healing(b) Maintain the molecular structure(c) Ineffectiveness(d) EffectivenessI got this question in an international level competition.This interesting question is from Classification of Lubricants in section Lubricants of Applied Chemistry
Answer» Correct answer is (a) Self-HEALING For explanation: Mobility of solid lubricants on the surface of adsorbates PROMOTES the self healing. It also prolongs the endurance of the films. As LONG as the FILM remains intact it can be protected.

Discussion

155.	What is the best lubricant for tractor roller?(a) graphite(b) heavy oil(c) grease(d) vegetable oilI have been asked this question by my college director while I was bunking the class.This key question is from Selection of Lubricants in portion Lubricants of Applied Chemistry
Answer» The CORRECT choice is (C) grease The explanation is: GENERALLY, grease is used for the tractor rollers as they are high pressure and low SPEED vehicles. Grease is a cheaper ONE.

Discussion

156.	The friction is needed to be reduced because _________(a) will increase the load(b) will increase the consumption electricity(c) it will be reducing the excess heat generation(d) will increase the excess the heat generationThis question was addressed to me during an online interview.I would like to ask this question from Selection of Lubricants topic in division Lubricants of Applied Chemistry
Answer» CORRECT ANSWER is (C) it will be reducing the excess heat generation Best explanation: The friction is needed to be reduced because it will be reducing the excess heat generation which will IMPROVE the machine LIFE period.

Discussion

157.	The retardation can be done by adding _________(a) Phenyl- α – napthylamine(b) Phenyl -β – napthylamine(c) Benzine- α – napthylamine(d) Benzine – α – napthylamineThe question was posed to me in final exam.I'd like to ask this question from Oxidation Stability and Aniline Number topic in division Lubricants of Applied Chemistry
Answer» RIGHT option is (b) Phenyl -β – napthylamine To ELABORATE: In most of the commercial oils, the rate of oxidation can be retarded by the addition of the sacrificial oxidation INHIBITORS like Phenyl -β – napthylamine.

Discussion

158.	Olive oil starts to solidify at __________(a) 1^oC(b) 2^oC(c) 3^oC(d) 4^oCI got this question in a job interview.Question is taken from Cloud Point and Pour Point topic in portion Lubricants of Applied Chemistry
Answer» Right answer is (d) 4^oC To ELABORATE: Olive oil STARTS to solidify at 4^oC. In winters or at very low TEMPERATURES around 0^oC, then the olive oil begins to DEVELOP white waxy clumps of solidified oil that SINK to the bottom of the container.

Discussion

159.	The fatty oils mostly constitute _________(a) Glycerine(b) Glycol(c) Ethanol(d) GlycerolI got this question in final exam.This interesting question is from Neutralization/Acidic Number in division Lubricants of Applied Chemistry
Answer» The correct choice is (d) Glycerol The best explanation: The FATTY acids constitute most of the part with glycerol. It also has the esters of HIGHER fatty acids as the NEXT major constituents. In some cases, we can also OBSERVE that a notable amount of FREE acids are also present in fatty acids.

Discussion

160.	The cylindrical vessel will be around the oil cup which serves as a water bath made up of __________(a) Brass(b) Chromium(c) Copper(d) AluminiumThis question was posed to me in a job interview.My doubt stems from Viscosity and Viscosity Index topic in section Lubricants of Applied Chemistry
Answer» Correct answer is (c) Copper Explanation: The OIL cup is SURROUNDED by a cylindrical VESSEL and it acts as a WATER BATH that is made up of the copper. It is provided by a tap. The tap is used for emptying the vessel by draining the water present in it.

Discussion

161.	The higher values of blended oils is because of the presence of ___________(a) Catalyst(b) Salts(c) Additives(d) ReagentsThe question was posed to me in quiz.Question is taken from Neutralization/Acidic Number in chapter Lubricants of Applied Chemistry
Answer» Right choice is (c) Additives For explanation I would say: The high VALUES of neutralisation of blended oils are because of the presence of the additives. The additives PRESENT in the oiliness CARRIERS, OXIDATION and corrosion INHIBITORS, etc.

Discussion

162.	The deformations caused in oil paintings are due to saponification.(a) True(b) FalseI had been asked this question in an online interview.The query is from Saponification Value topic in chapter Lubricants of Applied Chemistry
Answer» Right answer is (a) True The explanation is: The visible DEFORMATIONS OCCUR due to SAPONIFICATION. The ground layers of oil PAINT contain heavy pigments of metals like zinc white and they react with fatty acids and CAUSE saponification.

Discussion

163.	The liquid lubricant may be _______(a) Boiled(b) Evaporated(c) Sublimated(d) HeatedThis question was posed to me in an interview for internship.My question is from Mechanism of Lubrication topic in portion Lubricants of Applied Chemistry
Answer» Right option is (b) Evaporated The best explanation: The liquid lubricant may be evaporated or decomposed. DUE to this, the lubrication becomes ineffective, and the EFFECTIVENESS can be ACHIEVED by adding the extreme pressure ADDITIVES along with lubricant.

Discussion

164.	Addition of linear polymers to the increases the V.I and oils with V.I higher than _______ are prepared.(a) 100(b) 1000(c) 10000(d) 100000I got this question in an international level competition.I need to ask this question from Viscosity and Viscosity Index topic in chapter Lubricants of Applied Chemistry
Answer» Correct option is (a) 100 Best explanation: ADDITION of the linear polymers to the increases the V.I and oils V.I higher than 100 are prepared. Generally, the viscosity is the only FACTOR that decides the thickness of the oil or lubricating liquid.

Discussion

165.	How many mechanisms are there for lubrication?(a) 1(b) 2(c) 3(d) 4I have been asked this question by my school principal while I was bunking the class.The doubt is from Mechanism of Lubrication topic in chapter Lubricants of Applied Chemistry
Answer» Right option is (C) 3 To explain I would say: There are three mechanisms are there for lubrication. They are thin FILM lubrication, thick film lubrication and extreme pressure lubrication. The thick pressure lubrication is ALSO called as fluid film or hydro dynamic lubrication. The thin film lubrication is also called as boundary lubrication.

Discussion

166.	vegetable oils are added to the lubricants to improve their ___________(a) Lubrication(b) Oiliness(c) Viscosity(d) EfficiencyThis question was posed to me in final exam.My question is from Types of Additives topic in division Lubricants of Applied Chemistry
Answer» Right answer is (b) Oiliness For explanation I would say: Oiliness can be improved by adding VEGETABLE OILS, castor oils and olive OIL to the lubricants. The compounds having strong polar groups like dibenzyl dilsulphide, AMYL phenyl PHOSPHATE are used as oiliness improvers.

Discussion

167.	Petroleum oils are also called as _________(a) Petrol oils(b) Hydrocarbon oils(c) Fatty oils(d) Whale oilThis question was addressed to me in an internship interview.I want to ask this question from Classification of Lubricants topic in division Lubricants of Applied Chemistry
Answer» The correct option is (b) Hydrocarbon oils To EXPLAIN: The petroleum oils are also CALLED as the hydrocarbon oils. They contain C12 to C15. These oils are obtained from crude petroleum. They are cheap and have very wide applications.

Discussion

168.	Stabilized erosion of the fine solid particles in liquid is called ___________(a) colloidal suspension(b) molecular suspension(c) colloidal dispersion(d) molecular dispersionThe question was posed to me during an interview.Origin of the question is Classification of Lubricants in division Lubricants of Applied Chemistry
Answer» The correct option is (c) colloidal dispersion The explanation: Stabilized EROSION of the fine SOLID particles in liquid is CALLED molecular dispersion. When the molecular dispersion is takes PLACE and then the LUBRICATING oil started to show the characteristics and behaviour of the solid then it is said to be gel.

Discussion

169.	In steel and steel lubrication, the zinc dialkyl dithiosulphates forms __________(a) ZnSO4(b) ZnSO2(c) ZnSO3(d) ZnSI have been asked this question in an international level competition.The above asked question is from Types of Additives in portion Lubricants of Applied Chemistry
Answer» RIGHT OPTION is (d) ZnS Explanation: In steel and steel lubrication, the zinc dithiosulphates FORMS the zinc oxide, zinc sulphide and FERROUS oxide and some other zinc organo phosphates. They prevent the wear and tear of steel.

Discussion

170.	Coating and overlays will be done by using _________(a) inorganic lubricants(b) organic lubricants(c) soft metal(d) oxidesThis question was posed to me in unit test.Origin of the question is Classification of Lubricants in portion Lubricants of Applied Chemistry
Answer» Correct answer is (c) soft metal Easy explanation: Soft METALS are used in PURE forms to produce alloys. They actually used for coatings. They are used in lead BASED and TIN based ENGINE bearing over lays. They are also used in the matrix composite materials.

Discussion

171.	In textile industries _________ are added to the lubricants.(a) catalyst(b) inhibitors(c) oxygen(d) carbonThe question was asked in quiz.This interesting question is from Selection of Lubricants in portion Lubricants of Applied Chemistry
Answer» Correct answer is (b) inhibitors Easy explanation: Inhibitors are the negative catalysts that are added to the THIN OILS which are used as lubricants. This is to improve the sped of the machine and SMOOTH RUNNING.

Discussion

172.	A high temperature lubricants used may undergo ________(a) vulcanization(b) volatilization(c) lubrication(d) combustionThe question was posed to me in a job interview.This question is from Selection of Lubricants topic in portion Lubricants of Applied Chemistry
Answer» The correct option is (B) VOLATILIZATION To explain: A HIGH temperature LUBRICANTS used may undergo volatilization. The vulcanization is the process of rubber in PRESENCE of sulphur.

Discussion

Explore topic-wise InterviewSolutions in .

Lithium soap greases are __________(a) temperature resistant(b) fire resistant(c) water resistant(d) pressure resistantI got this question during an online exam.This key question is from Classification of Lubricants in portion Lubricants of Applied Chemistry

99% of grease is produced from __________(a) petroleum oil(b) olive oil(c) castor oil(d) whale oilI have been asked this question during an interview for a job.The doubt is from Classification of Lubricants topic in chapter Lubricants of Applied Chemistry

What is the best lubricant for tractor roller?(a) graphite(b) heavy oil(c) grease(d) vegetable oilI have been asked this question by my college director while I was bunking the class.This key question is from Selection of Lubricants in portion Lubricants of Applied Chemistry

Olive oil starts to solidify at __________(a) 1^oC(b) 2^oC(c) 3^oC(d) 4^oCI got this question in a job interview.Question is taken from Cloud Point and Pour Point topic in portion Lubricants of Applied Chemistry

The fatty oils mostly constitute _________(a) Glycerine(b) Glycol(c) Ethanol(d) GlycerolI got this question in final exam.This interesting question is from Neutralization/Acidic Number in division Lubricants of Applied Chemistry

The cylindrical vessel will be around the oil cup which serves as a water bath made up of __________(a) Brass(b) Chromium(c) Copper(d) AluminiumThis question was posed to me in a job interview.My doubt stems from Viscosity and Viscosity Index topic in section Lubricants of Applied Chemistry

The higher values of blended oils is because of the presence of ___________(a) Catalyst(b) Salts(c) Additives(d) ReagentsThe question was posed to me in quiz.Question is taken from Neutralization/Acidic Number in chapter Lubricants of Applied Chemistry

The deformations caused in oil paintings are due to saponification.(a) True(b) FalseI had been asked this question in an online interview.The query is from Saponification Value topic in chapter Lubricants of Applied Chemistry

The liquid lubricant may be _______(a) Boiled(b) Evaporated(c) Sublimated(d) HeatedThis question was posed to me in an interview for internship.My question is from Mechanism of Lubrication topic in portion Lubricants of Applied Chemistry

How many mechanisms are there for lubrication?(a) 1(b) 2(c) 3(d) 4I have been asked this question by my school principal while I was bunking the class.The doubt is from Mechanism of Lubrication topic in chapter Lubricants of Applied Chemistry

vegetable oils are added to the lubricants to improve their ___________(a) Lubrication(b) Oiliness(c) Viscosity(d) EfficiencyThis question was posed to me in final exam.My question is from Types of Additives topic in division Lubricants of Applied Chemistry

Petroleum oils are also called as _________(a) Petrol oils(b) Hydrocarbon oils(c) Fatty oils(d) Whale oilThis question was addressed to me in an internship interview.I want to ask this question from Classification of Lubricants topic in division Lubricants of Applied Chemistry

In steel and steel lubrication, the zinc dialkyl dithiosulphates forms __________(a) ZnSO4(b) ZnSO2(c) ZnSO3(d) ZnSI have been asked this question in an international level competition.The above asked question is from Types of Additives in portion Lubricants of Applied Chemistry

Coating and overlays will be done by using _________(a) inorganic lubricants(b) organic lubricants(c) soft metal(d) oxidesThis question was posed to me in unit test.Origin of the question is Classification of Lubricants in portion Lubricants of Applied Chemistry

In textile industries _________ are added to the lubricants.(a) catalyst(b) inhibitors(c) oxygen(d) carbonThe question was asked in quiz.This interesting question is from Selection of Lubricants in portion Lubricants of Applied Chemistry

A high temperature lubricants used may undergo ________(a) vulcanization(b) volatilization(c) lubrication(d) combustionThe question was posed to me in a job interview.This question is from Selection of Lubricants topic in portion Lubricants of Applied Chemistry