Answer as many as you can please. Thank you in advance!

Which of the following is a way to reduce the likelihood of a hazardous event as a result of a human error during a task? a. Convert it from an unwritten task to a written procedure so that the probability of making the error is less b. Increase the frequency at which the task must be done c. Provide more options for how the task can be done d. Rotate someone new into the job every time the task is completed Which of the following would be considered a common cause failure? a. A block valve fails to operate on loss of the instrument air supply while a second block valve fails to operate because it has not been connected to the back-up air tank yet. b. Three temperature transmitters in the same low temperature safety function all vote to trip when the steam supply to the process fails. c. Two redundant process safety loops are tied to the same process control system when the process controller locks up. d. Each of the failures above would be considered a common cause failure. One of the many problems with MIL-STD-882E is the use of terms that have no welldefined meaning. Which of the following is an example of that problem? a. Fleet or Inventory b. Improbable c. Significant environmental impact d. All of the above are examples of terms with no well-defined meaning. Assuming that each of these sensor architectures uses exactly the same type of sensors and that each design is capable of satisfying the design specifications for risk reduction and spurious trip rate, which is the worst choice? a. 1001 b. 1002 c. 2002 d. 2003 What effect does continuous monitoring have on the PFDAva of an IPL? a. It decreases it by a factor of 10 b. It has no effect since monitoring is already assumed to be part of the IPL c. It increases it by a factor of 10 d. It reduces the PFDAvs to zero. Which of the following could be an appropriate way to enter an IPL into a LOPA worksheet when that IPL is not specifically described in the list of standard IPLS? a. As an "Administrative control", with a PFDAvg of 0.1 b. As an "Engineering control", with a PFDAvG of 0.1 c. As an "Other Frequency Modifier", with PFDAvg supported by analysis d. Any of the above may be appropriate