Which field test is commonly performed to assess the physical adhesion strength of a cured, liquid-applied epoxy field joint coating?

Here are the answers to your questions:

Question 7:
The question asks which field test assesses the physical adhesion strength of a cured, liquid-applied epoxy field joint coating.

• A) Knife/Chisel adhesion test (e.g. peel test): This test directly measures the force required to remove a coating from a substrate, thus assessing its adhesion strength.
• B) Dry film thickness (DFT) measurement: This measures the thickness of the coating, not its adhesion.
• C) Ultrasonic thickness: This is used to measure the thickness of materials, often for non-destructive testing, not adhesion.
• D) Holiday detection test: This test detects pinholes or discontinuities in a coating that could lead to corrosion, not adhesion strength.

Therefore, the Knife/Chisel adhesion test is the appropriate method.

The correct option is A).

$$\boxed{\text{A) Knife/Chisel adhesion test (e.g. peel test)}}$$

Question 8:
The question asks for the minimum clearance distance when operating cranes or sidebooms near overhead power lines of up to 50kV if the lines are not de-energized.

According to OSHA (Occupational Safety and Health Administration) regulations (e.g., 29 CFR 1926.1408), for power lines rated up to 50 kV, the minimum clearance distance that must be maintained is 10 feet.

The correct option is C).

$$\boxed{\text{C) 10 feet}}$$