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Mobile Crane Review Questions & Correct Answers
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Mobile Crane Review Questions & Correct Answers
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Mobile Crane Review Questions & Correct AnswersWhat is the purpose of placing mats or cribbing under or cribbing under
outrigger floats? Correct Ans - Distribute the force over a larger
area.
Where is the best location for leveling a crane? Correct Ans -
Upperworks. (A revolving frame of equipment on which operating
machinery are mounted along operator's can)
Before leveling a mobile crane on outriggers, an operator should ensure:
Correct Ans - There is no weight of the crane bearing on any tires.
Operating a mobile crane with a long boom, on uneven ground, what
support condition should be considered? Correct Ans - Keeping a
90 degree angle between cylinder rod and pad.
When may blocking (cribbing) be placed under outrigger beams on mobile
cranes? Correct Ans - Never approved.
Mobile cranes should be level to within what percent of grade? Correct
Ans - 1%
Timber crane mats work best when they are: Correct Ans - Bolted
together
When arriving in the crane at the job site, the operator should first
determine the condition of the: Correct Ans - Access roads
What surface listed below would Not be a good location for assembly or
setup of a mobile crane? Correct Ans - A. Above compacted fill
B. Above highway asphalt
C. Above underground vaults
D. Above highway concrete
Each outrigger pad and its blocking should be sufficient to support?
Correct Ans - The total weight of the crane and its load.
,How does high wind affect a mobile crane with a long boom? Correct
Ans - Introduces side load onto the boom
When is the only time the outrigger beams should be less than fully
extended? Correct Ans - The load chart indicates that this is
allowed (always make sure that it is safe first)
What is the primary purpose for a rooster sheave or auxiliary boom point
sheave? Correct Ans - separate the load hoist lines.
Eccentric main boom tip reeving causes which of the following: Correct
Ans - twisting of the main boom
which type of wire rope listed below is installed on MOST cranes?
a. right regular lay
b. right alternate lay
c. left regular lay
d. left alternate lay Correct Ans - a. right regular lay
The hoist drum flange shall extend a minimum of _______ over the top layer
of wire rope at all times while crane is in operation.
a. 1/2 inch
b. 1 inch
c. 1 1/2 inch
d. 2 inch Correct Ans - 1/2 inch
Which type of wire rope listed below is installed on most cranes?
a. main hoist line
b. boom hoist line
c. Auxiliary hoist line
d. pendant line Correct Ans - pendant line
when lifting on outriggers, the floats or pads should always be:
a. sufficient to support three times the applies load
b. raised to touch the tires firmly on the ground
, c. secured to the outriggers cylinder
d. secured to the mats Correct Ans - secured to the outriggers
cylinder
on a mobile crane, how many broken wires are permitted at the connection
of a pendant before it must be taken out of service?
a. 6
b. 5
c. 3
d. 1 Correct Ans - 1
How many randomly broken wires in a lay length must there be on a
mobile cranes hoist line, before it should be removed from service?
a. 4
b. 3
c. 5
d. 6 Correct Ans - 6
what is the minimum design (unless rotation resistant) factor required for
a right regular lay, boom or hoist wire rope?
a. 5
b. 3.5
c. 2.5
d. 7 Correct Ans - 3.5
Type 1 rotation resistant hoist wire rope has a design factor of:
a. 2.5 to 1
b. 3 to 1
c. 3.5 to 1
d. 5 to 1 Correct Ans - 5 to 1
it is important to know when lubricating crane hoist wire rope, that the
lubricant must:
a. not hinder visual inspection
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