Exam (elaborations)
Mobile Cranes – Questions & Detailed Solutions
- Institution
- Certified Mobile Crane Operator
Mobile Cranes – Questions & Detailed Solutions
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Mobile Cranes – Questions & Detailed SolutionsDetermine if this statement is true or false. As crane signaling is only a
basic function and the signalperson knows where the loads will be
positioned, training or testing of the signalperson should not be required.
Correct Ans - False
When using hand signals to direct a crane operator, an extended arm with
the thumb vertical and the fingers opening and closing into a fist indicates:
Correct Ans - Raise boom and lower load
Two closed fists with both thumbs pointing toward each other is the signal
for: Correct Ans - Retract hydraulic boom
Which of the following is not a permitted use of an "operational aid"?
Correct Ans - Used to test weigh a load prior to hoisting
Determine if this statement is true or false. Any crane component can be
used on any other crane made by the same company. Correct Ans -
False
A rough terrain crane is commonly referred to as: Correct Ans -
Cherry picker
Which of these conditions could be dangerous when operating a crane
around a newly constructed building? Correct Ans - Uncompacted
soil
When hoisting on outriggers with a permitted 360 degree swing, which
position is the most hazardous in most conditions? Correct Ans -
Over corner
Determine if this statement is true or false. The ground pressure under
outriggers is higher than it is under a crawler track because of a smaller
bearing surface. Correct Ans - True
An outrigger float should be approximately how much larger than the
outrigger pad? Correct Ans - 3 times
, When setting up a crawler crane for use on a new site, which of the
following is not required prior to use? Correct Ans - Name of the
person who will operate the crane
Where should the slings be attached when lifting lattice boom sections?
Correct Ans - Use the end connections
Determine if this statement is true or false. During crane assembly, the
counterweight is mounted after the installation of the complete boom.
Correct Ans - False
When assembling lattice boom sections, which set of pins are installed
first? Correct Ans - Both upper
When installing the boom pins, the pin should be pointing: Correct Ans
- Out away from boom center
When dismantling a lattice boom, which boom pins should be removed
first? Correct Ans - Both lower
Determine if this statement is true or false. It is safe to climb under a boom
to knock out the boom pins if the crane has tension on the pendant lines.
Correct Ans - False
What important step must be followed when welding a damaged crane
boom? Correct Ans - - Follow manufacturers welding procedure
- Have a welder certified to the correct welding procedure
- Use correct welding rods and heat treatment
- All of the above (answer)
What position should the gantry of a crane be in when lifting a load?
Correct Ans - Highest position
Jib forestay and backstay pendant lines should be: Correct Ans - Of
equal length, or the backstay pendant lines should be longer
Determine if this statement is true or false. Jib capacity "increases" as the
angle to the ground decreases. Correct Ans - False
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