Mobile Crane Review UPDATED ACTUAL
Exam Questions and CORRECT Answers
What is the purpose of placing mats or cribbing under or cribbing under outrigger floats? -
CORRECT ANSWER Distribute the force over a larger area.
Where is the best location for leveling a crane? - CORRECT ANSWER 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
ANSWER 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 ANSWER Keeping a 90 degree angle between cylinder rod and
pad.
When may blocking (cribbing) be placed under outrigger beams on mobile cranes? - CORRECT
ANSWER Never approved.
Mobile cranes should be level to within what percent of grade? - CORRECT ANSWER 1
%
Timber crane mats work best when they are: - CORRECT ANSWER Bolted together
When arriving in the crane at the job site, the operator should first determine the condition of the:
- CORRECT ANSWER Access roads
What surface listed below would Not be a good location for assembly or setup of a mobile
crane? - CORRECT ANSWER 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
ANSWER The total weight of the crane and its load.
How does high wind affect a mobile crane with a long boom? - CORRECT
ANSWER Introduces side load onto the boom
When is the only time the outrigger beams should be less than fully extended? - CORRECT
ANSWER 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
ANSWER separate the load hoist lines.
Eccentric main boom tip reeving causes which of the following: - CORRECT
ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 5 to 1
it is important to know when lubricating crane hoist wire rope, that the lubricant must:
a. not hinder visual inspection
b. not be applied in direct sunlight
c. not be applied prior to use
d. not be applied to regular lay wire rope - CORRECT ANSWER not hinder visual
inspection
Exam Questions and CORRECT Answers
What is the purpose of placing mats or cribbing under or cribbing under outrigger floats? -
CORRECT ANSWER Distribute the force over a larger area.
Where is the best location for leveling a crane? - CORRECT ANSWER 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
ANSWER 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 ANSWER Keeping a 90 degree angle between cylinder rod and
pad.
When may blocking (cribbing) be placed under outrigger beams on mobile cranes? - CORRECT
ANSWER Never approved.
Mobile cranes should be level to within what percent of grade? - CORRECT ANSWER 1
%
Timber crane mats work best when they are: - CORRECT ANSWER Bolted together
When arriving in the crane at the job site, the operator should first determine the condition of the:
- CORRECT ANSWER Access roads
What surface listed below would Not be a good location for assembly or setup of a mobile
crane? - CORRECT ANSWER 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
ANSWER The total weight of the crane and its load.
How does high wind affect a mobile crane with a long boom? - CORRECT
ANSWER Introduces side load onto the boom
When is the only time the outrigger beams should be less than fully extended? - CORRECT
ANSWER 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
ANSWER separate the load hoist lines.
Eccentric main boom tip reeving causes which of the following: - CORRECT
ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 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 ANSWER 5 to 1
it is important to know when lubricating crane hoist wire rope, that the lubricant must:
a. not hinder visual inspection
b. not be applied in direct sunlight
c. not be applied prior to use
d. not be applied to regular lay wire rope - CORRECT ANSWER not hinder visual
inspection
