ExxonMobil Test ExxonMobil Mechanical Aptitude

Question 1

If Gear A has 20 teeth and Gear B has 40 teeth, and Gear A rotates at 100 RPM, what is the speed of Gear B?

Accepted Answer

50 RPM

Answer

Gear ratio = 20/40 = 0.5; Gear B speed = 100 × 0.5 = 50 RPM.

Question 2

A valve is used to control fluid flow in a pipeline. Which type of valve provides the best flow control with a quarter-turn operation?

Accepted Answer

Ball valve

Answer

Ball valves operate with a 90-degree (quarter-turn) rotation and provide reliable on/off flow control.

Question 3

In a hydraulic system, if the input piston has an area of 5 cm² and a force of 100 N is applied, what pressure is generated?

Accepted Answer

20 Pa

Answer

Pressure = Force ÷ Area = 100 N ÷ 5 cm² = 20 N/cm² (20 Pa in simplified units).

Question 4

Which type of pump is best suited for moving high-viscosity fluids like heavy crude oil?

Accepted Answer

Gear pump

Answer

Gear pumps are positive displacement pumps best suited for high-viscosity fluids because they produce steady flow regardless of viscosity.

Question 5

A lever has its fulcrum 1 meter from a 200 N load. How far from the fulcrum must a 50 N force be applied to balance it?

Accepted Answer

4 meters

Answer

Torque balance: 200 × 1 = 50 × d; d = 200/50 = 4 meters.

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