ExxonMobil Test ExxonMobil Problem Solving 2

Question 1

You are given data: Plant A produces 500 units with 10 defects; Plant B produces 800 units with 14 defects. Which plant has a better defect rate?

Accepted Answer

Plant B, with 1.75% defect rate

Answer

Plant A, with 2.0% defect rate

Answer

Plant A, with 2.5% defect rate

Answer

Both plants have the same defect rate

Question 2

A safety audit finds 3 critical, 7 major, and 12 minor non-conformances. Using risk prioritization, which should be addressed first?

Accepted Answer

The 3 critical findings, as they pose the greatest risk

Answer

The 12 minor findings, as they represent the most work

Answer

All findings simultaneously to show commitment to safety

Answer

The 7 major findings, as they represent the largest single category

Question 3

A control room operator observes two alarms simultaneously: high pressure in Vessel A and low level in Vessel B. These vessels are connected by a transfer line. What is the most logical conclusion?

Accepted Answer

The transfer line between the vessels is blocked or closed

Answer

Both instruments are malfunctioning at the same time

Answer

Vessel A has a leak and Vessel B has a level sensor fault

Answer

The vessels are operating normally and alarms are routine

Question 4

Production costs are: labor $120,000, materials $340,000, overhead $90,000, and energy $50,000. If a 15% cost reduction is required, which area should be prioritized?

Accepted Answer

Materials, as it is the largest cost component

Answer

Labor, as it has potential for workforce reduction

Answer

Energy, as it is the easiest to reduce

Answer

Overhead, as it is a discretionary cost

Question 5

An ExxonMobil manager must choose between two projects. Project X has NPV of $2.1M with 70% probability of success; Project Y has NPV of $3.5M with 40% probability. Which has the higher expected value?

Accepted Answer

Project X, with expected value of $1.47M

Answer

Project Y, with expected value of $1.4M

Answer

Both projects have the same expected value

Answer

Project X, with expected value of $2.1M

Question 6

A process diagram shows that Stream C is produced when Streams A and B are combined and heated. If Stream C has abnormally high impurities, where should the investigation begin?

Accepted Answer

Both Stream A and Stream B quality simultaneously

Answer

The heating equipment

Answer

The storage tank receiving Stream C

Answer

The quality testing laboratory