New PMP Question & Answers with explanation

Midway into project execution, one of your senior project team members is leaving the company. Due to a delay in filling the position, you have decided to assign the affected tasks to two less experienced employees. Which factor would most strongly affect the duration of their assigned tasks?
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A project manager had originally planned to use both of the company's industrial 3D printers simultaneously for a project but has just learned that one of them will be unavailable. The project manager adjusts the schedule so that the components are created sequentially using the one remaining 3D printer. Unfortunately, this action affects the critical path and delays the planned finish date of the project. What tool or technique has the project manager used in this situation?
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You are working with your team on estimating how much time each activity will take. One of the documents you are using contains information on categories of labor, material, and equipment required to complete your project. You are also interested to see skill levels of your labor, any certifications required, and grade levels of your supplies. Which of the following documents would you primarily refer to for this purpose?
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You are facing problems decomposing the testing work package into the final activities required to complete the work package. Detailed testing plans and activities cannot be determined until the system is at least 50% developed and more details become available. The system development work package will take at least three months to complete. What is the best way to resolve this problem?

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A project with both Schedule Performance Index (SPI) and Cost Performance Index (CPI) of 0.80. The project is currently:

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