EXPLANATIONS UPDATED QUESTION BANK
QUESTIONS & DETAILED ANSWERS
When lifting from the main boom, how is the effective weight of the fly/jib different in the
erected position from that of the stowed position?
, A. Effective weight increases
B. Effective weight decreases
C. Effective weight is reduced 85%
D. Effective weight is reduced 75% - answer A. Effective weight increases
Who must determine maximum speed for a mobile crane to travel with a suspended load?
A. The competent person
B. The job site
C. The superintendent
D. The craft foreman - answer A. the competent person
How does the effective weight of a stowed extension relate to the actual weight of the
extension?
A. Lower than the actual weight
B. Depends on the boom angle
C. Higher than the actual weight
D. Same as the actual weight - answer C. higher than the actual weightUsing a telescopic
mobile crane and lifting off the jib with the main boom partially extended, you should use
____________ to determine gross capacity
A. Jib length
B. Boom angle
C. Radius
Boom length - answer B. boom angle
If not listed in the load\capacity charts or notes for a telescopic boom crane and you are
between boom lengths, you should: