FAILURE MODE AND EFFECTS ANALYSIS
(FMEA) EXAM QUESTIONS WITH ALL
ANSWERS CORRECT
What type of hazard analysis technique is FMECA? - ANSWER DD-HAT
Does FMEA identify hazards - ANSWER partially
Does FMEA identify root causes? - ANSWER partially
Is FMEA qualitative or quantitative? - ANSWER both
What is the level of depth of FMEA? - ANSWER in-depth
What is a failure? - ANSWER - Departure of an item from its required or
intended operation, function, or behavior
- Inability of a system, subsystem, or component to perform its required
function
What is a failure mode? - ANSWER - Manner by which an item fails
- Mode or state the items is in after it fails
- Way in which the failure of an item occurs
What is FMEA? - ANSWER Failure mode and effects analysis (FMEA) is a
tool for evaluating the effect(s) of potential failure modes of subsystems,
assemblies, components, or functions
Is FMEA equipment oriented? - ANSWER FMEA is equipment oriented and
not hazards oriented
What are the ten process steps of FMEA? - ANSWER 1. Define system:
scope, mission, operation, components
2. Plan FMEA: Team, worksheets, schedule, elements & functions
3. Establish safety criteria: principles, guidelines
4. Acquire data: diagrams, drawings, checklists, lessons, regulations
5. Conduct FMEA: Worksheet, Failure modes, TLMs, SCFs
, 6. Evaluate risk: mishap risk for each hazard & mitigation
7. Recommend Actions: countermeasures
8. Monitor corrective action: evaluate effect of actions
9. Track hazards: Update with hazards, causal factors, risk
10. Document FMEA: report with entire processes and worksheets and
conclusions and recommendations
What are general failure modes? - ANSWER - Failure to operate
- Premature operation
- Intermittent operation
- Failure to cease operation at a prescribed time
- Loss of output
- Degraded output
What is FMECA? - ANSWER Failure Modes, Effects and Criticality Analysis
(FMECA) is FMEA plus an evaluation of how critical a component is to system
success.
What is the equation for the criticality number? - ANSWER
C=(alpha)(Beta)(lambda)(t)
alpha is 'failure mode ratio'
Beta is 'failure effect probability'
lambda is 'part failure rate'
t is 'operating time'
What is the equation for Risk priority number? - ANSWER RPN =
(probability of occurrence)(severity ranking)(detection ranking)
What are the limitation of FMEA? - ANSWER 1. Focuses on single failure
modes rather than failure mode combinations.
2. Not designed to identify hazards unrelated to failure modes.
3. Provides limited examination of human error.
4. Provides limited examination of external influences and interfaces.
(FMEA) EXAM QUESTIONS WITH ALL
ANSWERS CORRECT
What type of hazard analysis technique is FMECA? - ANSWER DD-HAT
Does FMEA identify hazards - ANSWER partially
Does FMEA identify root causes? - ANSWER partially
Is FMEA qualitative or quantitative? - ANSWER both
What is the level of depth of FMEA? - ANSWER in-depth
What is a failure? - ANSWER - Departure of an item from its required or
intended operation, function, or behavior
- Inability of a system, subsystem, or component to perform its required
function
What is a failure mode? - ANSWER - Manner by which an item fails
- Mode or state the items is in after it fails
- Way in which the failure of an item occurs
What is FMEA? - ANSWER Failure mode and effects analysis (FMEA) is a
tool for evaluating the effect(s) of potential failure modes of subsystems,
assemblies, components, or functions
Is FMEA equipment oriented? - ANSWER FMEA is equipment oriented and
not hazards oriented
What are the ten process steps of FMEA? - ANSWER 1. Define system:
scope, mission, operation, components
2. Plan FMEA: Team, worksheets, schedule, elements & functions
3. Establish safety criteria: principles, guidelines
4. Acquire data: diagrams, drawings, checklists, lessons, regulations
5. Conduct FMEA: Worksheet, Failure modes, TLMs, SCFs
, 6. Evaluate risk: mishap risk for each hazard & mitigation
7. Recommend Actions: countermeasures
8. Monitor corrective action: evaluate effect of actions
9. Track hazards: Update with hazards, causal factors, risk
10. Document FMEA: report with entire processes and worksheets and
conclusions and recommendations
What are general failure modes? - ANSWER - Failure to operate
- Premature operation
- Intermittent operation
- Failure to cease operation at a prescribed time
- Loss of output
- Degraded output
What is FMECA? - ANSWER Failure Modes, Effects and Criticality Analysis
(FMECA) is FMEA plus an evaluation of how critical a component is to system
success.
What is the equation for the criticality number? - ANSWER
C=(alpha)(Beta)(lambda)(t)
alpha is 'failure mode ratio'
Beta is 'failure effect probability'
lambda is 'part failure rate'
t is 'operating time'
What is the equation for Risk priority number? - ANSWER RPN =
(probability of occurrence)(severity ranking)(detection ranking)
What are the limitation of FMEA? - ANSWER 1. Focuses on single failure
modes rather than failure mode combinations.
2. Not designed to identify hazards unrelated to failure modes.
3. Provides limited examination of human error.
4. Provides limited examination of external influences and interfaces.
