Discussion
Consider the following statements about lubricants.
1. Viscosity falls as temperature rises 2. A mineral oil has a high saponification value 3. Graphite lubricates poorly in a vacuum
Answer: A
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: viscosity falls as temperature rises, and graphite needs adsorbed moisture so it lubricates poorly in a vacuum. Statement 2 is the reverse of the truth - a mineral oil contains no esters and so has a saponification value of essentially zero, which is how it is distinguished from a fatty oil.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development