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

1000 GPM

Answer

500 GPM

Answer

650 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

The system is safe to open

Answer

Pressure has been fully relieved

Answer

Normal operating condition

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

20 lb

Answer

2,500 lb

Answer

100 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

Thrust bearing

Answer

Sleeve bearing

Answer

Needle bearing

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

To generate steam for power

Answer

To filter impurities from crude oil

Answer

To measure fluid temperature

Question 6

A drive belt connects two pulleys: driving pulley diameter 10 cm and driven pulley diameter 5 cm. If the drive pulley turns at 400 RPM, what is the driven pulley speed?

Accepted Answer

800 RPM

Answer

200 RPM

Answer

400 RPM

Answer

1,600 RPM