ExxonMobil Test Mechanical Aptitude

Question 1

In a simple pulley system with one fixed and one movable pulley, what effort is required to lift a 400 lb load?

Accepted Answer

200 lb

Answer

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?

Accepted Answer

Gate valve

Answer

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?

Accepted Answer

300 RPM

Answer

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?

Accepted Answer

To release excess pressure and prevent equipment failure

Answer

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?

Accepted Answer

6 feet

Answer

Torque balance: 300 × 2 = 100 × d; d = 600 ÷ 100 = 6 feet.

ExxonMobil Test Practice Test