Question

Which of the following cannot be used for angular measurements?

• A. Angle plate
• B. Sine bar
• C. Bevel protractor
• D. Clinometers

Hint:

Think about the primary function of each tool. An angle plate provides a fixed angle, while sine bars, bevel protractors, and clinometers are used to determine unknown angles.

Answer 1

The Correct Option is A

Step 1: Understand the purpose of angular measurements.
Angular measurement involves determining the angle between two surfaces or lines. Various instruments and tools are designed for this purpose. Step 2: Examine the function of each listed option.
Angle plate: An angle plate is a precision work-holding device used in machining and inspection. It is a rigid, L-shaped block with flat, perpendicular surfaces. It is primarily used to support workpieces at a fixed angle (usually 90 degrees) or to provide a reference surface. It is not directly used to measure angles. Sine bar: A sine bar is a precision measuring instrument used to set or measure angles accurately. It consists of a hardened steel bar with two precision rollers at a known distance apart. By placing the sine bar on a flat surface and raising one roller using gauge blocks to a specific height, a precise angle is created or measured using trigonometric principles.
Bevel protractor: A bevel protractor is an instrument used for measuring angles. It typically consists of a graduated circular scale and a movable blade that can be adjusted to the angle being measured. Vernier bevel protractors offer even higher precision.
Clinometers: Clinometers (or inclinometers) are instruments used for measuring angles of slope, elevation, or depression of an object with respect to gravity. They are used in various applications, including surveying, construction, and navigation.
Step 3: Identify the tool that is not primarily used for measuring angles.
From the descriptions above, the angle plate is primarily a work-holding and reference tool, not a direct angle measuring instrument. While it provides a known angle (usually 90 degrees), it doesn't measure arbitrary angles between other surfaces. Step 4: Confirm that the other options are used for angular measurements.
Sine bars, bevel protractors, and clinometers are all specifically designed and used for measuring angles with varying degrees of precision and in different applications. Step 5: Select the correct answer.
The angle plate cannot be used for angular measurements in the same way that the other options can.