Document 2026/2027 | Industrial
Diagnostics, Maintenance
Section 1: Troubleshooting Fundamentals and Methodology
1. What is the first step in the systematic troubleshooting process?
A) Identify the root cause
B) Verify the problem
C) Implement the solution
D) Test the solution
Answer: B) Verify the problem
Rationale: The first step is to verify the problem by confirming a problem exists
through operator reports, visual observation, and machine operation. The
sequence is: Verify Problem → Identify Root Cause → Implement Solution → Test
Solution → Document .
2. Define troubleshooting.
A) The process of installing new machinery
B) The process of finding the cause of a machine or system malfunction
C) The process of performing routine maintenance
D) The process of training new operators
Answer: B) The process of finding the cause of a machine or system malfunction
Rationale: Troubleshooting is specifically the process of identifying the cause of a
malfunction in a machine or system .
,3. A failure that occurs only sometimes and is difficult to reproduce is called
a(n):
A) Permanent failure
B) Intermittent failure
C) Hard failure
D) Catastrophic failure
Answer: B) Intermittent failure
Rationale: Intermittent failures are sporadic and occur only under specific
conditions like temperature changes, vibration, or at certain operating points—
making them the most challenging type to troubleshoot .
4. A permanent failure is characterized by:
A) The equipment working intermittently
B) The failure being present continuously until repaired
C) The failure being temperature-dependent
D) The failure being caused by operator error
Answer: B) The failure being present continuously until repaired
Rationale: A permanent failure exists continuously from occurrence until repair.
Identifying this type of failure is simpler than finding intermittent failures .
5. What is the first step in the "Five-Step Troubleshooting Method"?
A) Identify the possible root cause
B) Gather information and observe the symptoms
C) Implement the solution
D) Test the solution
Answer: B) Gather information and observe the symptoms
Rationale: The first step is to gather information and observe symptoms by talking
to the operator, observing the machine in operation, and reviewing log data.
Jumping to a solution without thorough observation is a common mistake .
6. What is the purpose of "half-splitting" in troubleshooting?
, A) To replace components one at a time
B) To systematically divide the system to isolate the faulty area
C) To test the entire system at once
D) To ignore the most likely causes
Answer: B) To systematically divide the system to isolate the faulty area
Rationale: Half-splitting divides the system in half to determine which side the
fault is on, quickly narrowing down the problem location. For example, testing a
signal at the circuit midpoint can eliminate half the circuit .
7. During the "Implement the Solution" step, what is the most important
consideration?
A) Using the cheapest replacement part
B) Following lockout/tagout (LOTO) and safety procedures
C) Working as quickly as possible
D) Documenting the repair
Answer: B) Following lockout/tagout (LOTO) and safety procedures
Rationale: Safety is the priority when implementing a solution. LOTO procedures
must be followed to isolate the machine from energy sources before any repair
work begins .
8. After implementing the repair, what is the next step?
A) Document the repair
B) Turn the system back on and test the solution
C) Disassemble the equipment
D) Begin another repair
Answer: B) Turn the system back on and test the solution
Rationale: The system must be tested after repair to ensure the problem is
resolved and no new problems are introduced. This is the "Test the Solution" step .
9. Why is documentation important in troubleshooting?