Question

Given the desired characteristics of the lubricating oil, pick the correct answer

1. Low enough viscosity to provide good pumping and avoid undue cranking resistance.

2. Must have sufficiently high viscosity at high temperature and low volatility.

1. 1 is correct, 2 is wrong
2. 1 wrong is, 2 is correct
3. Both 1 and 2 are correct
4. Both 1 and 2 are wrong

Answer 1

Correct Answer - Option 3 : Both 1 and 2 are correct

Explanation:

Characteristics of the lubricating oil:

• Keep surfaces separate under all loads, temperatures, and speeds, thus minimizing friction and wear.
• Act as a cooling fluid removing the heat produced by friction or from external sources
• Low enough viscosity to provide good pumping and avoid undue cranking resistance.
• Must have sufficiently high viscosity at high temperature and low volatility.
• Remain adequately stable in order to guarantee constant behavior over the forecasted useful life
• Protect surfaces from the attack of aggressive products formed during operation
• Show cleaning capability and dirt holding capacity in order to remove residue and debris that may form during operation