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Answer :
Final answer:
The preferred tool for drilling large holes in concrete is a rotary hammer drill, while the shank types for rotary hammers can vary by manufacturer. Test plugs are used for sealing DWV piping during testing, and typically a pressure of 10 psi is required for air testing the piping system.
Explanation:
Answers to the Questions
1. For drilling 1/2" and larger diameter holes in concrete, a(n) rotary hammer drill (C) is generally preferred. This tool is specifically designed for heavy-duty work such as drilling into concrete, offering both rotation and a hammering action that breaks up the hard material efficiently.
2. The shanks of bits for rotary hammers vary by manufacturer (C). While some common types include SDS and spline shanks, there is no single standard as different manufacturers may produce their tools with unique specifications.
3. The devices used to close openings in DWV piping during testing are called test plugs (D). They are essential for sealing the system to allow for pressure testing without leaks.
4. Air testing of the DWV piping generally requires 10 psi of pressure to be applied to the piping system (B). This level is adequate for ensuring that there are no leaks before the system is put into operation.
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