Match the signal person's hand signal with the desired crane operator action.
1) _____ Arm extended, thumb pointing down, and flexing the fingers in and out.
2) _____ Both arms extended, palms down, arms moving rapidly back and forth horizontally.
3) _____ Arm extended, fingers closed, thumb pointing downward.
4) _____ Forearm vertical, forefinger pointing up, and hand moving in a small horizontal circle.
5) _____ Tapping the elbow with one hand.
A. Lower the boom
B. Lower the boom and raise the load
C. Raise the load
D. Emergency stop
E. Use the whip line
F. Extend the boom
1) B. Lower the boom and raise the load
2) D. Emergency stop
3) A. Lower the boom
4) C. Raise the load
5) E. Use the whip line
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What will be an ideal response?
PROBLEM 3.155 Three solid shafts, each of ?(3/4)-in. diameter, are connected by gears shown. Knowing that G = 11.2 × 106 psi, determine (a) the angle through which end A of shaft AB rotates, (b) the angle through which end E of shaft EF rotates.
Which rating is the ACEA rating specified for use by many European vehicle manufacturers?
A) SAE B) GF-4 C) A3/B3 D) SM
Prevention through design is a new theory of accident causation
Indicate whether the statement is true or false