ExxonMobil Test ExxonMobil Mechanical Aptitude 2

Question 1

A pulley system uses 3 ropes supporting a load. If the load weighs 900 N, how much force is needed to lift it (ignoring friction)?

Accepted Answer

300 N

Answer

A 3-rope pulley system provides a mechanical advantage of 3; force = 900 ÷ 3 = 300 N.

Question 2

What happens to the boiling point of water when pressure is increased?

Accepted Answer

It increases

Answer

Higher pressure raises the boiling point of water, which is why pressure cookers cook food faster.

Question 3

In a centrifugal pump, what is cavitation?

Accepted Answer

Formation and collapse of vapor bubbles causing damage

Answer

Cavitation occurs when local pressure drops below vapor pressure, forming bubbles that implode and damage the impeller.

Question 4

Which of the following best describes the function of a pressure relief valve?

Accepted Answer

To prevent overpressure by releasing fluid when pressure exceeds a set point

Answer

A pressure relief valve opens automatically when system pressure exceeds a preset limit to protect equipment.

Question 5

A belt drives two pulleys. Pulley A has a diameter of 10 cm and rotates at 400 RPM. What is the RPM of Pulley B with a diameter of 20 cm?

Accepted Answer

200 RPM

Answer

Speed ratio = D_A/D_B = 10/20 = 0.5; Speed B = 400 × 0.5 = 200 RPM.

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