CQPA Practice Exam 2 (V, VI, VII) Graded To Score A+
Parameter
True numeric population value, often unknown, estimated by a statistic
Population
All possible observations of similar items from which a sample is drawn
Statistic
A numerical data value taken from a sample that may be used to make an inference
about a population
MIL-STD-721C (1981)
Considered by reliability professionals as the "dictionary" for reliability and
maintainability terms
Accessibility
A measure of the relative ease of admission to the areas of an item for the purpose of
operation or maintenance
Availability
A measure of the degree to which an item is in an operable and committable state at the
start of a mission when the mission is called for at an unknown (random) time
Burn-in
The operation of an item under stress to stabilize its characteristics
Checkout
Tests of an item to determine its condition or status
Corrective Action
A documented design, process, procedure, or materials change implemented and
validated to correct the cause of failure or design deficiency
Criticality
A relative measure of the consequences of a failure mode and its frequency of
occurances
De-bugging
a process to detect and remedy inadequacies
Dependability
A measure of the degree to which an item is operable and capable of performing its
required function at any (random) time during a specified mission profile
Derating
(a) using an item in such a way that applied stresses are below rated values
(b) The lowering of the rating of an item in one stress field to allow an increase in
another stress field
Durability
A measure of useful life (a special case of reliability)
Environment
The aggregate of all external and internal conditions (such as temperature, humidity,
radiation, magnetic and electric fields, shock vibration, etc.)
Environmental Stress Screening (ESS)
A series of tests conducted under environmental stresses to disclose weak parts and
workmanship defects for correction
Failure
, The event, or inoperable state, in which any item or part of an item does not perform as
previously specified
Failure Analysis
Subsequent to a failure, the logical systematic examination of an item, its construction,
application, and documentation to identify the failure and determine the failure
mechanism
Failure Catastrophic
A failure that can cause an item loss
Failure, Critical
A failure, or combination of failures, that prevents an item from performing a specific
mission
Failure Effect
The consequence(s) a failure mode has on the operation, function, or status of an item.
Failure efforts are classified as local effects, next higher levels, and end effects
Failure Mode and Effects Analysis
A procedure by which each potential failure mode in a system is analyzed to determine
the results or effects thereof on the system and to classify each potential failure mode
according to its severity
Failure Intermittent
Failure for a limited period of time, followed by the item's recover and its ability to
perform within specified limits without any remedial action.
Failure Mechanism
A physical, chemical, electrical, thermal, or other, process which results in a failure
Failure Mode
The consequence of the mechanism through which the failure occurs (ex: short, open,
fracture, excessive wear)
Failure, Random
A failure whose occurrence is predictable only in a probabilistic or statistical sense
Failure Rate
The total number of failures within an item population divided by the total number of life
units expended by that population, during a particular measurement interval under
stated conditions
Fault
Immediate cause of failure (ex: maladjustment, misalignment, defect, etc.)
Fault Isolation
The process of determining the location of a fault to the extent necessary to effect repair
FRACAS
Failure Reporting, Analysis and Corrective Actions System
This is a closed loop system of data collection, analysis and dissemination to identify
and correct failures of a product or process
Life Profile
A time-phased description of the events and environments an item experiences from
manufacture to final removal from the operational inventory
Maintainability
Parameter
True numeric population value, often unknown, estimated by a statistic
Population
All possible observations of similar items from which a sample is drawn
Statistic
A numerical data value taken from a sample that may be used to make an inference
about a population
MIL-STD-721C (1981)
Considered by reliability professionals as the "dictionary" for reliability and
maintainability terms
Accessibility
A measure of the relative ease of admission to the areas of an item for the purpose of
operation or maintenance
Availability
A measure of the degree to which an item is in an operable and committable state at the
start of a mission when the mission is called for at an unknown (random) time
Burn-in
The operation of an item under stress to stabilize its characteristics
Checkout
Tests of an item to determine its condition or status
Corrective Action
A documented design, process, procedure, or materials change implemented and
validated to correct the cause of failure or design deficiency
Criticality
A relative measure of the consequences of a failure mode and its frequency of
occurances
De-bugging
a process to detect and remedy inadequacies
Dependability
A measure of the degree to which an item is operable and capable of performing its
required function at any (random) time during a specified mission profile
Derating
(a) using an item in such a way that applied stresses are below rated values
(b) The lowering of the rating of an item in one stress field to allow an increase in
another stress field
Durability
A measure of useful life (a special case of reliability)
Environment
The aggregate of all external and internal conditions (such as temperature, humidity,
radiation, magnetic and electric fields, shock vibration, etc.)
Environmental Stress Screening (ESS)
A series of tests conducted under environmental stresses to disclose weak parts and
workmanship defects for correction
Failure
, The event, or inoperable state, in which any item or part of an item does not perform as
previously specified
Failure Analysis
Subsequent to a failure, the logical systematic examination of an item, its construction,
application, and documentation to identify the failure and determine the failure
mechanism
Failure Catastrophic
A failure that can cause an item loss
Failure, Critical
A failure, or combination of failures, that prevents an item from performing a specific
mission
Failure Effect
The consequence(s) a failure mode has on the operation, function, or status of an item.
Failure efforts are classified as local effects, next higher levels, and end effects
Failure Mode and Effects Analysis
A procedure by which each potential failure mode in a system is analyzed to determine
the results or effects thereof on the system and to classify each potential failure mode
according to its severity
Failure Intermittent
Failure for a limited period of time, followed by the item's recover and its ability to
perform within specified limits without any remedial action.
Failure Mechanism
A physical, chemical, electrical, thermal, or other, process which results in a failure
Failure Mode
The consequence of the mechanism through which the failure occurs (ex: short, open,
fracture, excessive wear)
Failure, Random
A failure whose occurrence is predictable only in a probabilistic or statistical sense
Failure Rate
The total number of failures within an item population divided by the total number of life
units expended by that population, during a particular measurement interval under
stated conditions
Fault
Immediate cause of failure (ex: maladjustment, misalignment, defect, etc.)
Fault Isolation
The process of determining the location of a fault to the extent necessary to effect repair
FRACAS
Failure Reporting, Analysis and Corrective Actions System
This is a closed loop system of data collection, analysis and dissemination to identify
and correct failures of a product or process
Life Profile
A time-phased description of the events and environments an item experiences from
manufacture to final removal from the operational inventory
Maintainability
