INEN 4301 EXAM 3 QUESTIONS AND ANSWERS
There is an inverse relationship between the investment in reliability (cost) and reliability. - CORRECT
ANSWER✅✅False
In an exponential distribution the failure rate is constant. - CORRECT ANSWER✅✅True
As products become more complex, the probability that they will not function increases. - CORRECT
ANSWER✅✅True
There are four factors associated with reliability, they are________. (Choose all that apply) - CORRECT
ANSWER✅✅- numerical value
- intended function
- environment condition
- life
The ______is the probability that the product will function satisfactorily during a particular time. -
CORRECT ANSWER✅✅numerical value
Components A and B are connected in parallel. A and B are then connected in series with components C
and D. The reliability values for A and B are 0.90 and 0.95 respectively. The reliability values for C and D
are 0.90 and 0.99. What is the system reliability? - CORRECT ANSWER✅✅.8865
Determine the failure rate for an item that has the test of 10 items terminated at the end of 20 hours.
Five of the items failed after 2, 4, 8, 10, and 11 hours respectively. Five items are still operating at the
end of 22 hours. The items were not replaced. - CORRECT ANSWER✅✅.037
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was not replaced.
Determine the failure rate. - CORRECT ANSWER✅✅.0000119
, The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was replaced. Determine
the mean life. Assume that there is a constant failure rate. - CORRECT ANSWER✅✅8000
Determine the mean life for an item that has the test of 10 items terminated at the end of 20 hours. Five
of the items failed after 2, 4, 8, 10, and 11 hours respectively. Five items are still operating at the end of
22 hours. The items were not replaced. Assume that there is a constant failure rate. - CORRECT
ANSWER✅✅27.00
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 5 motors were ran continuously until failure.
The five failures occurred at 1050, 8155, 9016, 9051, and 9591 hours. Determine the failure rate. -
CORRECT ANSWER✅✅.000136
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was replaced. Determine
the failure rate. - CORRECT ANSWER✅✅not .0000119 or .0000114
A system has five components. The reliability values for each component are as follows; 0.999, 0.997,
0.999, 0.996 and 0.991. If the components are in parallel what is the system reliability? - CORRECT
ANSWER✅✅.999
A system has five components. The reliability values for each component are as follows; 0.999, 0.997,
0.999, 0.996 and 0.991. If the components are in series what is the system reliability? - CORRECT
ANSWER✅✅.982
Life and Reliability testing plans can be conducted with replacement of a failed unit or without
replacement. - CORRECT ANSWER✅✅true
There is an inverse relationship between the investment in reliability (cost) and reliability. - CORRECT
ANSWER✅✅False
In an exponential distribution the failure rate is constant. - CORRECT ANSWER✅✅True
As products become more complex, the probability that they will not function increases. - CORRECT
ANSWER✅✅True
There are four factors associated with reliability, they are________. (Choose all that apply) - CORRECT
ANSWER✅✅- numerical value
- intended function
- environment condition
- life
The ______is the probability that the product will function satisfactorily during a particular time. -
CORRECT ANSWER✅✅numerical value
Components A and B are connected in parallel. A and B are then connected in series with components C
and D. The reliability values for A and B are 0.90 and 0.95 respectively. The reliability values for C and D
are 0.90 and 0.99. What is the system reliability? - CORRECT ANSWER✅✅.8865
Determine the failure rate for an item that has the test of 10 items terminated at the end of 20 hours.
Five of the items failed after 2, 4, 8, 10, and 11 hours respectively. Five items are still operating at the
end of 22 hours. The items were not replaced. - CORRECT ANSWER✅✅.037
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was not replaced.
Determine the failure rate. - CORRECT ANSWER✅✅.0000119
, The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was replaced. Determine
the mean life. Assume that there is a constant failure rate. - CORRECT ANSWER✅✅8000
Determine the mean life for an item that has the test of 10 items terminated at the end of 20 hours. Five
of the items failed after 2, 4, 8, 10, and 11 hours respectively. Five items are still operating at the end of
22 hours. The items were not replaced. Assume that there is a constant failure rate. - CORRECT
ANSWER✅✅27.00
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 5 motors were ran continuously until failure.
The five failures occurred at 1050, 8155, 9016, 9051, and 9591 hours. Determine the failure rate. -
CORRECT ANSWER✅✅.000136
The ABC Electric Motor Company provides the motors for Company XYZ s conveyor belts. Company XYZ
has asked the ABC Electric Motor Company to determine the failure rate for the motors supplied. ABC
Electric Motor Company designed an experiment where 11 motors were ran continuously for 8000
hours or until failure. Of the 11 motors that were tested, only 1 failed at 4270 hours. The remaining 10
motors were operational throughout the experiment. When the motor failed it was replaced. Determine
the failure rate. - CORRECT ANSWER✅✅not .0000119 or .0000114
A system has five components. The reliability values for each component are as follows; 0.999, 0.997,
0.999, 0.996 and 0.991. If the components are in parallel what is the system reliability? - CORRECT
ANSWER✅✅.999
A system has five components. The reliability values for each component are as follows; 0.999, 0.997,
0.999, 0.996 and 0.991. If the components are in series what is the system reliability? - CORRECT
ANSWER✅✅.982
Life and Reliability testing plans can be conducted with replacement of a failed unit or without
replacement. - CORRECT ANSWER✅✅true
