CM 2113 UPDATED EXAMS SCRIPT ALL QUESTIONS
AND ANSWERS SURE A+
✔✔Pros and cons of different types of cranes - ✔✔Rough terrain crane "pickers"
-Pros= off road applications, set up quickly, very maneuverability.
-Cons= limitation of capacity and cost of freight
*All terrain crane
-pros= travel on highway and rough terrains
-cons= limitation of capacity, set up time, maneuverability and foot print.
*Crawler
-Pros= don't require outriggers, very high lifting capacity, any site even soft soils, travel
with load
-Cons= expensive, set up time, large foot print, lot of matting, larger number of fall off
loads
✔✔top slewing cranes - ✔✔cranes can increase their height
✔✔Tower cranes - ✔✔The flexibility of its freely suspended hook moving in three planes
provides a tremendous advantage in terms of load pick-up and positioning.
Advantage of having both the operator and jib above the construction site.
✔✔Crane selection factors - ✔✔
, ✔✔Hoisting - ✔✔The hoist cable runs from the hoist drum located on the crane's
counter jib, through the jib and then to the trolley and down to the hook
✔✔Trolleying - ✔✔the horizontal movement of the trolley along the jib; this allows
adjustment of the operating radius.
✔✔Slewing - ✔✔when the job rotates around the tower's vertical axis
✔✔cranes selection - ✔✔1. Operating radius
2. Lifting capacity
3. Lifting speed
✔✔tower cranes - ✔✔5% working margin be maintained on every twoer crane lift
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the operator correction factor? - ✔✔0.75
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the material-weight correction factor? Assume the percent swell
is 12%. - ✔✔0.88
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the visibility correction factor? - ✔✔0.80
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the work efficiency correction factor? - ✔✔0.83
AND ANSWERS SURE A+
✔✔Pros and cons of different types of cranes - ✔✔Rough terrain crane "pickers"
-Pros= off road applications, set up quickly, very maneuverability.
-Cons= limitation of capacity and cost of freight
*All terrain crane
-pros= travel on highway and rough terrains
-cons= limitation of capacity, set up time, maneuverability and foot print.
*Crawler
-Pros= don't require outriggers, very high lifting capacity, any site even soft soils, travel
with load
-Cons= expensive, set up time, large foot print, lot of matting, larger number of fall off
loads
✔✔top slewing cranes - ✔✔cranes can increase their height
✔✔Tower cranes - ✔✔The flexibility of its freely suspended hook moving in three planes
provides a tremendous advantage in terms of load pick-up and positioning.
Advantage of having both the operator and jib above the construction site.
✔✔Crane selection factors - ✔✔
, ✔✔Hoisting - ✔✔The hoist cable runs from the hoist drum located on the crane's
counter jib, through the jib and then to the trolley and down to the hook
✔✔Trolleying - ✔✔the horizontal movement of the trolley along the jib; this allows
adjustment of the operating radius.
✔✔Slewing - ✔✔when the job rotates around the tower's vertical axis
✔✔cranes selection - ✔✔1. Operating radius
2. Lifting capacity
3. Lifting speed
✔✔tower cranes - ✔✔5% working margin be maintained on every twoer crane lift
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the operator correction factor? - ✔✔0.75
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the material-weight correction factor? Assume the percent swell
is 12%. - ✔✔0.88
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the visibility correction factor? - ✔✔0.80
✔✔A contractor wants to investigate the production and cost differences of using a 4S
blade on a crawler-type dozer (D4H-4S). The material is dry clay and is to be moved a
distance of 150 ft from the beginning of the cut. The dozing is uphill on a 20% grade.
The operator will have average skill. The site conditions will be dark for visibility. The
material weighs 108 pcf in the bank state. Job efficiency is assumed to be equivalent to
a 50-min hour. What is the work efficiency correction factor? - ✔✔0.83
