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JSA: Job Safety Analysis
FTA: Fault Tree Analysis
For event A to occur a preliminary, intentional action B, is needed; for example, lifting the cover
that protects a critical switch, permitting it to be thrown. Such a design is called:
Interlock
Isolation device
Lockout
Lockin *Interlock
This is a description of the concept of an interlock in terms of probabilities and systems
terminology
A specific activity intended to improve one of more aspects of the safety system or contribute
to the solution of a specific accident problem, is called:
countermeasure
mitigation
hazard control
safeguard *countermeasure
is a specific activity designed to improve or reduce a specific accident problem
All of the following are examples of malfunctions which cause an impact to a system EXCEPT
,structural
mechanical
power
human *human
The potential malfunctions in any system include
- structural failure
- mechanical malfunctions
- power failures
- electrical malfunctions
The human component, though critical, is not considered a malfunction
Maintenance ground-keepers often use self-propelled machines to assist them with their work.
The most protective type of guard used for this equipment is the:
self-adjusting
adjustable
interlocked
fixed *interlocked
self-propelled lawn mowers and snow blowers are interlocked with the source of power so that
the machine cannot be operated without all guards in place. The interlocking guard prevents
operation of the control that sets that machine in motion until the guard is moved into position,
so that the operator cannot reach the point of operation or of the point of danger
A light curtain safety interlock system is being proposed for an automatic metal shearing
machine. Assuming a standard hand speed of 63 in/sec, and a machine shut down time of 0.5
,sec, what is the minimum acceptable distance from the point-of-operation to the sensing field
of the light curtain?
31.5 in
47.3 in
63 in
126 in *31.5 in
standard hand speed x time necessary for the interlock to shut down the equipment
Fail-safe designs try to ensure that a failure will leave the product unaffected or will convert it
to a state in which no injury or damage will occur. Which design does NOT meet this criteria?
fail passive arrangements
fail active design
fail operational arrangements
fail mode design *fail mode design
all of the following designs may be considered fail safe.
FAIL PASSIVE ARRANGEMENTS are similar to fuses and circuit breakers; they reduce the system
to its first level
FAIL ACTIVE DESIGN maintains any condition that will keep the system in a safe mode until
corrective or overriding action occurs
FAIL OPERATION ARRANGEMENTS allow functions to continue safely until corrective action is
possible
, In system safety design, which design philosophy is the closest to "perfect" safety?
intrinsically safe
fail safe
fail passive
fail operational *intrinsically safe
This design philosophy seeks to limit failures to an extremely small percentage. All of the others
allow failure, but seek to engineer out the hazard a failure would bring
This system safety design reduces the system to its lowest energy level given a failure:
intrinsically safe
fail passive
fail active
fail operational *fail passive
An example of a fail-passive device is the
fuse
emergency generator
high temperature light switch
A&C *fuse
brings the system to its lowest energy state ("0" current flow)
The System Safety design philosophy, given a failure, keeps the system energized in a safe
mode until corrective or overriding action can take place
JSA: Job Safety Analysis
FTA: Fault Tree Analysis
For event A to occur a preliminary, intentional action B, is needed; for example, lifting the cover
that protects a critical switch, permitting it to be thrown. Such a design is called:
Interlock
Isolation device
Lockout
Lockin *Interlock
This is a description of the concept of an interlock in terms of probabilities and systems
terminology
A specific activity intended to improve one of more aspects of the safety system or contribute
to the solution of a specific accident problem, is called:
countermeasure
mitigation
hazard control
safeguard *countermeasure
is a specific activity designed to improve or reduce a specific accident problem
All of the following are examples of malfunctions which cause an impact to a system EXCEPT
,structural
mechanical
power
human *human
The potential malfunctions in any system include
- structural failure
- mechanical malfunctions
- power failures
- electrical malfunctions
The human component, though critical, is not considered a malfunction
Maintenance ground-keepers often use self-propelled machines to assist them with their work.
The most protective type of guard used for this equipment is the:
self-adjusting
adjustable
interlocked
fixed *interlocked
self-propelled lawn mowers and snow blowers are interlocked with the source of power so that
the machine cannot be operated without all guards in place. The interlocking guard prevents
operation of the control that sets that machine in motion until the guard is moved into position,
so that the operator cannot reach the point of operation or of the point of danger
A light curtain safety interlock system is being proposed for an automatic metal shearing
machine. Assuming a standard hand speed of 63 in/sec, and a machine shut down time of 0.5
,sec, what is the minimum acceptable distance from the point-of-operation to the sensing field
of the light curtain?
31.5 in
47.3 in
63 in
126 in *31.5 in
standard hand speed x time necessary for the interlock to shut down the equipment
Fail-safe designs try to ensure that a failure will leave the product unaffected or will convert it
to a state in which no injury or damage will occur. Which design does NOT meet this criteria?
fail passive arrangements
fail active design
fail operational arrangements
fail mode design *fail mode design
all of the following designs may be considered fail safe.
FAIL PASSIVE ARRANGEMENTS are similar to fuses and circuit breakers; they reduce the system
to its first level
FAIL ACTIVE DESIGN maintains any condition that will keep the system in a safe mode until
corrective or overriding action occurs
FAIL OPERATION ARRANGEMENTS allow functions to continue safely until corrective action is
possible
, In system safety design, which design philosophy is the closest to "perfect" safety?
intrinsically safe
fail safe
fail passive
fail operational *intrinsically safe
This design philosophy seeks to limit failures to an extremely small percentage. All of the others
allow failure, but seek to engineer out the hazard a failure would bring
This system safety design reduces the system to its lowest energy level given a failure:
intrinsically safe
fail passive
fail active
fail operational *fail passive
An example of a fail-passive device is the
fuse
emergency generator
high temperature light switch
A&C *fuse
brings the system to its lowest energy state ("0" current flow)
The System Safety design philosophy, given a failure, keeps the system energized in a safe
mode until corrective or overriding action can take place
