ExxonMobil Test Mechanical Aptitude 2

Question 1

A centrifugal pump's flow rate is 500 GPM at 1,000 RPM. If the speed increases to 1,500 RPM, what is the new flow rate?

Accepted Answer

750 GPM

Answer

Flow rate scales linearly with speed: 500 × (1,500/1,000) = 750 GPM.

Question 2

What does a pressure gauge reading of zero indicate when a system is known to be pressurized?

Accepted Answer

A faulty or damaged gauge

Answer

A zero reading on a pressurized system signals a malfunctioning gauge that should be inspected before proceeding.

Question 3

In a hydraulic system, if the input piston area is 5 sq in and output piston area is 25 sq in, what output force is generated by a 100 lb input force?

Accepted Answer

500 lb

Answer

Pascal's Law: output force = input force × (output area / input area) = 100 × (25/5) = 500 lb.

Question 4

Which type of bearing is designed to support radial loads and resist rotation friction in rotating shafts?

Accepted Answer

Ball bearing

Answer

Ball bearings are the standard choice for supporting radial loads while reducing rotational friction.

Question 5

What is the primary purpose of a heat exchanger in a refinery?

Accepted Answer

To transfer heat between two fluid streams without mixing them

Answer

Heat exchangers transfer thermal energy between process streams while keeping the fluids separated.

ExxonMobil Test Practice Test

ExxonMobil Test Practice Test

ExxonMobil Test Mechanical Aptitude 2