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Mobile Cranes No. 1 exam
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Mobile Cranes No. 1 exam
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Mobile Cranes No. 1 examThe load radius as shown on the capacity chart is the distance from the center of
rotation to the centerline of the vertical host line with: - CORRECT ANSWER :
The rated load suspended.
If the jib angle to ground is changed from 50 degrees to 40 degrees, this would
affect the capacity of the crane how? - CORRECT ANSWER : Capacity will
decrease.
Load capacity charts are based on 75% of tipping for crawler cranes without out
riggers. For wheel mounted cranes, using outriggers fully extended, capacities are
based on what percentage of tipping? - CORRECT ANSWER : 85%
The operators should exercise extreme caution when lifting loads from the water
mainly because: - CORRECT ANSWER : The load on the crane will increase as
an object leaves the water.
On the upper works - CORRECT ANSWER : On the carrier.
When working on soft soil with poor bearing support: - CORRECT ANSWER :
Use matting to distribute crane's weight over a larger area.
The best way to determine the weight of a load to be lifted is to: - CORRECT
ANSWER : Have a certified load weight and add in the weight of all rigging.
When a situation arises that will not permit outriggers to be set at positions that
correspond to the locations established by the manufacturer's load rating charts, the
, crane manufacturer shall be consulted to determine if any capacity reductions,
special operation procedures, or limitations are required. If required information is
not available from the manufacturer, whom shall be consulted? - CORRECT
ANSWER : Qualified person.
When performing a pick and carry operation using a crawler crane, the load should
be positioned: - CORRECT ANSWER : Over the front.
A thick dark line running across the load chart means that the load listings: -
CORRECT ANSWER : Above the lines are limited by structural factors.
Dynamic motion such as swinging with a load can cause what change in the crane
operation? - CORRECT ANSWER : Increased load radius.
The dead end of the wire rope above the wedge socket must extend a minimum of
6 times the rope diameter or: - CORRECT ANSWER : 6 inches.
A work area chart is used to: - CORRECT ANSWER : Identify capacity changes
due to operational quadrants.
Which of the following 3 sling hitches is listed in order from the strongest to the
weakest? - CORRECT ANSWER : Basket, Vertical, Chocker.
An anti-2-block damage of prevention system will: - CORRECT ANSWER :
Prevent any crane movements that will cause a 2-block condition.
The minimum distance for safety between the swing radius of the counter weight
and any obstacle is: - CORRECT ANSWER : 2 Feet.
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