Question
Download Solution PDFThe flash point of lubricant should be _______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- With the movement of the two mating parts of the machine, heat is generated.
- If it is not controlled the temperature may rise resulting in total damage of the mating parts.
- Therefore, a film of a cooling medium with high viscosity is applied between the mating parts which are known as a lubricant.
Properties of lubricant
|
Viscosity |
It is the fluidity of oil by which it can withstand high pressure or load without squeezing out from the bearing surface |
|
Oiliness |
Oiliness refers to a combination of wettability, surface tension, and slipperiness. |
|
Flashpoint |
It is the temperature at which the vapor is given off from the oil. |
|
Fire point |
It is the temperature at which the oil catches fire and continues to be in flame |
|
Pour point |
The temperature at which the lubricant is able to flow when poured |
|
Emulsification |
It indicates the tendency of an oil to mix intimately with water to form a more or less stable emulsion. |
The following table shows the Flash points of different materials.
|
Product |
Flash Point (°F) |
|
Kerosene |
100+ |
|
Fuel Oils |
100 – 140 |
|
Diesel Oils |
130 |
|
Lubricating Oil |
300 |
|
Asphalt |
400 |
Last updated on Jul 5, 2025
-> RRB ALP CBT 2 Result 2025 has been released on 1st July at rrb.digialm.com.
-> RRB ALP Exam Date OUT. Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.
-> Railway Recruitment Board activated the RRB ALP application form 2025 correction link, candidates can make the correction in the application form till 31st May 2025.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> Bihar Home Guard Result 2025 has been released on the official website.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.
->The candidates must have passed 10th with ITI or Diploma to be eligible for this post.
->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.
-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways.
-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.
-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here