EICA MOBILE CRANE & DIGGER DERRICK EXAM
QUESTIONS AND ANSWERS | 100% VERIFIED AND
WELL DETAILED ANSWERS | LATEST UPDATE
2026/2027 (GRADED A+)
If not overloaded, the ground bearing pressure of a single outrigger pad
can approach a weight equal to:
85% of the weight of the crane and 100% of the suspended load
If you move a crawler crane from soft ground to harder ground, ground
bearing pressure will increase
On a crawler crane, ground bearing pressure is greatest when hoisting
where?
over the corner
If an outrigger pad has 45,000 pounds applied to it and the pad measures
2ft x 2ft how many psi is it applying to the ground?
78 PSI
How much area would be required for 45,000 pounds to create only 20 PSI?
2,250 square inches
Why use mats or cribbing?
To reduce ground bearing pressure
What is the purpose of placing blocking or pads under the outrigger floats?
Distribute the force over a larger area
While swinging a heavy load with a crane set up on outriggers and the
operator swings over one of the outriggers, that outrigger must be able to
support
85% of the weight of the crane and 100% of the weight of the load
What is the first thing an operator should do before traveling under a low
pipe rack or obstruction?
post a signalperson to check clearances
,According to OSHA, when traveling under an energized power line, what is
the minimum distance for a line with over 750kv?
20ft
When working at ground floor level near a cellar wall, the crane's outrigger
pads or tracks should be placed at least as far back as the depth of the wall
below ground
According to OSHA who is responsible for ensuring proper ground
conditions when setting up a mobile crane?
The controlling entity
What is not a good location for crane set up?
Above utilities
What is the best procedure to follow when underground utilities may be
present?
Contact local utility company
While performing a shift inspection on a crane and there is water
accumulation around the outrigger, what must be done?
Drained
While operating a boom truck near a reinforced retaining wall, it is
recommended to stay back
A distance equal to the depth
When a crane is in transit and you are required to pass under 50kV power
lines, what is OSHA's minimum required clearance?
6 ft (Table T)
If setting up the crane by a ditch or an excavation, you should stay at least
what distance from the edge?
1 ½ times the depth of the excavation
What would be a concern when setting up a crane over a sewer or water
main?
,Weight and vibration from the machine and load
When setting up a crane in an area that has public access, you should
barricade:
the jobsite
When operating a crane in a tight space, what would be the recommended
minimum clearance for the rear swing of the crane?
2 ft
The load line of the crane you're operating comes into contact with an
energized power line. There's no sign of any other danger, such as fire. In
such a situation, you should stay in the cab until the lines are de-energized
What is the most common cause of death to ground personnel working with
cranes electrocution
According to ASME B30.5, when working around power lines of more than
750kV, how much clearance is generally required from any part of the
crane and its load
45 ft
When setting up a crane, what must be barricaded to protect workers?
The hazardous areas created by the rotating superstructure
According to OSHA, what area must be barricaded to prevent employees
from entering
accessible areas within the swing radius of the rear of the rotating superstructure
of the crane
The best way to keep people from being injured from the counterweight of
the crane is to
Fence or barricade the swing area of the crane
What is the proper procedure when using an insulating link or a boot near
power lines be sure to maintain the correct allowable distance from the lines
When working closer than 10 feet on a 12 KV line
De-energize and ground the circuit.
, What is the minimum allowable clearance from the crane and power lines
under 50kV
10 ft
When working near power lines, when is a dedicated spotter required?
When the crane can reach within 20 ft. of power lines
According to OSHA 1926 Subpart CC, how many power line warning
decals must be on a crane working in construction? 3
What is the minimum clearance for a crane operating near an energized
power line of 40 kV for a non-qualified electrical worker? 10 ft
What must a person working around energized power lines not wear?
Conductive items
If a crane is being used closer than 10' to an energized power line, the
operator must
Be an electrically qualified person
A crane in operation makes contact with an energized power line and the
crane bursts into flames, what should the operator do?
Jump from the crane
Who does the link protect when using an insulated link on a crane hook?
Ground personnel
Protective grounding equipment must be able to conduct the maximum
fault current at the point of grounding.
What is the minimum approach distance for an unqualified crane operator
with a qualified electrical worker as an observer doing work around a 12 KV
circuit?
10 feet
When is it safe to handle loads under powerlines?
The load nor any part of the crane can come closer than regulations allow
QUESTIONS AND ANSWERS | 100% VERIFIED AND
WELL DETAILED ANSWERS | LATEST UPDATE
2026/2027 (GRADED A+)
If not overloaded, the ground bearing pressure of a single outrigger pad
can approach a weight equal to:
85% of the weight of the crane and 100% of the suspended load
If you move a crawler crane from soft ground to harder ground, ground
bearing pressure will increase
On a crawler crane, ground bearing pressure is greatest when hoisting
where?
over the corner
If an outrigger pad has 45,000 pounds applied to it and the pad measures
2ft x 2ft how many psi is it applying to the ground?
78 PSI
How much area would be required for 45,000 pounds to create only 20 PSI?
2,250 square inches
Why use mats or cribbing?
To reduce ground bearing pressure
What is the purpose of placing blocking or pads under the outrigger floats?
Distribute the force over a larger area
While swinging a heavy load with a crane set up on outriggers and the
operator swings over one of the outriggers, that outrigger must be able to
support
85% of the weight of the crane and 100% of the weight of the load
What is the first thing an operator should do before traveling under a low
pipe rack or obstruction?
post a signalperson to check clearances
,According to OSHA, when traveling under an energized power line, what is
the minimum distance for a line with over 750kv?
20ft
When working at ground floor level near a cellar wall, the crane's outrigger
pads or tracks should be placed at least as far back as the depth of the wall
below ground
According to OSHA who is responsible for ensuring proper ground
conditions when setting up a mobile crane?
The controlling entity
What is not a good location for crane set up?
Above utilities
What is the best procedure to follow when underground utilities may be
present?
Contact local utility company
While performing a shift inspection on a crane and there is water
accumulation around the outrigger, what must be done?
Drained
While operating a boom truck near a reinforced retaining wall, it is
recommended to stay back
A distance equal to the depth
When a crane is in transit and you are required to pass under 50kV power
lines, what is OSHA's minimum required clearance?
6 ft (Table T)
If setting up the crane by a ditch or an excavation, you should stay at least
what distance from the edge?
1 ½ times the depth of the excavation
What would be a concern when setting up a crane over a sewer or water
main?
,Weight and vibration from the machine and load
When setting up a crane in an area that has public access, you should
barricade:
the jobsite
When operating a crane in a tight space, what would be the recommended
minimum clearance for the rear swing of the crane?
2 ft
The load line of the crane you're operating comes into contact with an
energized power line. There's no sign of any other danger, such as fire. In
such a situation, you should stay in the cab until the lines are de-energized
What is the most common cause of death to ground personnel working with
cranes electrocution
According to ASME B30.5, when working around power lines of more than
750kV, how much clearance is generally required from any part of the
crane and its load
45 ft
When setting up a crane, what must be barricaded to protect workers?
The hazardous areas created by the rotating superstructure
According to OSHA, what area must be barricaded to prevent employees
from entering
accessible areas within the swing radius of the rear of the rotating superstructure
of the crane
The best way to keep people from being injured from the counterweight of
the crane is to
Fence or barricade the swing area of the crane
What is the proper procedure when using an insulating link or a boot near
power lines be sure to maintain the correct allowable distance from the lines
When working closer than 10 feet on a 12 KV line
De-energize and ground the circuit.
, What is the minimum allowable clearance from the crane and power lines
under 50kV
10 ft
When working near power lines, when is a dedicated spotter required?
When the crane can reach within 20 ft. of power lines
According to OSHA 1926 Subpart CC, how many power line warning
decals must be on a crane working in construction? 3
What is the minimum clearance for a crane operating near an energized
power line of 40 kV for a non-qualified electrical worker? 10 ft
What must a person working around energized power lines not wear?
Conductive items
If a crane is being used closer than 10' to an energized power line, the
operator must
Be an electrically qualified person
A crane in operation makes contact with an energized power line and the
crane bursts into flames, what should the operator do?
Jump from the crane
Who does the link protect when using an insulated link on a crane hook?
Ground personnel
Protective grounding equipment must be able to conduct the maximum
fault current at the point of grounding.
What is the minimum approach distance for an unqualified crane operator
with a qualified electrical worker as an observer doing work around a 12 KV
circuit?
10 feet
When is it safe to handle loads under powerlines?
The load nor any part of the crane can come closer than regulations allow
