Question 635 Deck General

The correct answer is D) raise the boom. The signal with the arm extended, fingers closed, and thumb pointing upward is the standard hand signal for "raise the boom" in crane operations, as specified in the Occupational Safety and Health Administration (OSHA) regulations for crane and derrick safety. This signal instructs the crane operator to raise the boom of the crane, which is the pivoting structural member that supports the hoisting mechanism and load. The other answer choices are incorrect because they do not match the specific hand signal described. Checking the boom stop, raising the hook, and raising the boom and hook are different signals with distinct hand positions.