Intro to Millwright Practice Exam

What tool is used to determine if a surface is level, plumb, or at a 45-degree angle?

1. Plumb Bob

2. Level

3. Square

4. Measuring Tape

The correct answer is: Level

The tool that is primarily used to determine if a surface is level, plumb, or set at a 45-degree angle is known as a level. A level typically contains a horizontal tube filled with liquid and an air bubble. When the bubble is centered between the marked lines in the tube, it indicates that the surface is completely level in relation to the force of gravity. For plumb applications, levels also come with a vertical vial, so when the bubble is centered, it shows that the surface is perpendicular to the ground. Additionally, specific types of levels, such as a combination square or a torpedo level, can assist in checking angles, including the standard 45-degree angle, by aligning with the markings on the tool. In contrast, while a plumb bob is instrumental for vertical reference and a square is designed to ensure right angles, neither specifically measures level nor indicates 45 degrees directly. A measuring tape is useful for distance measurement but does not provide information on orientation relative to level or plumb standards.