ExxonMobil Test Mechanical Aptitude 1 — Questions and Answers
Question 1: In a simple pulley system with one fixed and one movable pulley, what effort is required to lift a 400 lb load?
- 200 lb (Correct answer)
- 400 lb
- 100 lb
- 300 lb
Correct answer: 200 lb
A movable pulley gives a mechanical advantage of 2, so effort = 400 ÷ 2 = 200 lb.
Question 2: Which type of valve is BEST suited for completely stopping or allowing flow in a pipeline?
- Gate valve (Correct answer)
- Globe valve
- Ball valve
- Check valve
Correct answer: Gate valve
Gate valves are designed for fully open or fully closed operation, making them ideal for on/off service.
Question 3: Gear A has 20 teeth and drives Gear B, which has 40 teeth. If Gear A rotates at 600 RPM, at what speed does Gear B rotate?
- 300 RPM (Correct answer)
- 600 RPM
- 1200 RPM
- 150 RPM
Correct answer: 300 RPM
Speed ratio is inversely proportional to tooth count: 600 × (20/40) = 300 RPM.
Question 4: What is the purpose of a pressure relief valve in an ExxonMobil processing system?
- To release excess pressure and prevent equipment failure (Correct answer)
- To increase system pressure automatically
- To measure flow rate
- To filter contaminants
Correct answer: To release excess pressure and prevent equipment failure
Pressure relief valves open automatically when pressure exceeds a set limit, protecting equipment from overpressure damage.
Question 5: A lever has a fulcrum 2 feet from a 300 lb load. How far from the fulcrum must a 100 lb effort be applied to achieve balance?
- 6 feet (Correct answer)
- 3 feet
- 4 feet
- 8 feet
Correct answer: 6 feet
Torque balance: 300 × 2 = 100 × d; d = 600 ÷ 100 = 6 feet.
Question 6: Which material is most commonly used for high-pressure pipelines in petrochemical facilities due to its strength and corrosion resistance?
- Carbon steel (Correct answer)
- Aluminum
- PVC
- Copper
Correct answer: Carbon steel
Carbon steel offers the strength and pressure resistance needed for high-pressure petroleum pipelines.
ExxonMobil Test Mechanical Aptitude 1
In a simple pulley system with one fixed and one movable pulley, what effort is required to lift a 400 lb load?