New PMP Question & Answers with explanation

A project risk budget was approved that only considered high-impact/high-potential risks. During project execution, a risk with high impact but very low potential occurs. While it is in the risk register, it is not in the budget. What should the project manager do first?
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Signs of a potential economic recession were present during the planning stages of a large construction project. The risk of the recession was assigned as low probability and high impact, with an expected duration of 6-12 months. Soon after the project begins, the recession occurs and impacts the project as expected. After six months, the duration of the recession's impact is changed to 24-36 months. What should the project manager do?
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A final deliverable will not be completed on time, which is delaying project closure. What should the project manager do next?
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A project manager is informally told that a possible union action will involve their project team. At this stage of the project, any delays will significantly impact the schedule and budget. The probability of this union action was assumed to be minimal and was, therefore, unanticipated. What should the project manager do?
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Several months after the implementation of an approved change to manage a risk, a project manager learns that the change failed to achieve the expected result. This led to adverse consequences. What should the project manager have done to avoid this?
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