Start buttons are what color and type?

• A. Black, Fully guarded type
• B. Black, Unguarded type
• C. Red, Fully guarded type
• D. Blue, Raised type

Answer: (A)

Start controls are designed to require a deliberate action and to stay protected from accidental contact. The best choice reflects two safety-focused ideas: the guarding and the color coding used in this context. A fully guarded pushbutton is enclosed to prevent accidental activation, which is crucial for a action that starts machinery and could pose a risk if triggered unintentionally. The black color used for this start control helps distinguish it within the control station, signaling it as the primary active control in this scheme. If a start button were unguarded, it could be pressed by mistake during routine handling or by stray objects, increasing the chance of an unsafe start. A different color would imply another function, and a raised type speaks more to the shape than to safety guarding. So the combination black and fully guarded aligns with the safety intent for starting operations in this curriculum.