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NAVFAC P-307 Training Question and Answers.
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NAVFAC P-307 Training Question and Answers.
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NAVFAC P-307 Training Question and AnswersWhat types of power does a category 1 or 4 crane generally use and what is it's source?
- Ans A hook is what type of component? - Ans Load-bearing part
Hydraulic foot brakes are what type of group of components - Ans Load-controlling parts
Load-_____ parts are those that support the load. - Ans Bearing
How is electrical current conveyed from the revolving portion of the crane to the lower crane structure? - Ans Through the collector ring system
Safety devices that provide protection for personnel and equipment are considered _________ safety devices? - Ans General
Safety devices that affect the safe load lifting and handling capabilities of the equipment
are considered ______________ safety devices - Ans Operational
which of the following does not affect the safe operation of the crane - Ans General safety devices
A travel alarm is what type of group of components - Ans General safety devices
to find the weight of a aluminum plate, you would multiply... - Ans Square feet times material weight per square foot based on a specified thickness
A triangular shaped 1 inch thick metal plate has a base of a 10 feet and a height of 15 feet. What is the area of the plate? - Ans 75 square feet
A circular shaped 1/2 inch thick aluminum plate has a diameter of 7 feet. What is the area of the plate rounded up? - Ans 39 square feet
A complex shape of 1 inch thick aluminum plate has a rectangular area of 64 square feet and triangular area of 16 square feet. if aluminum weights 14 pounds per square foot, how much does the plate weigh (rounded up) - Ans 1,200lbs
A complex shape of 1 inch thick aluminum plate measures 6 feet long on the top edge, 8 feet wide on the left edge , 12 feet long on the bottom edge, ending with a 10 foot long
hypotenuse connecting back to the top edge. What is the correct equation to find the area of the triangular shape? - Ans 8 x 6 /2 the formula for determining the area of a triangular shaped object is - Ans Base x Height divided by 2
A box has 27 cubic feet of sand in it. Sand weights 105 lbs per cubic foot. the box weighs 1200 lbs empty. the correct equation to find the total weight is - Ans 27 x 105 = 2,835 + 1,200 = 4, 035
A cylinder is made of solid aluminum which has a unit weight of 165 pounds per cubic foot. What is the weight of this cylinder if the diameter is 4 feet and the height is 5 feet? - Ans 10, 362 lbs
A rectangular shaped tank has a length of 24 feet, a width of 10 feet, and a height of 12 feet. What is the volume of the tank? - Ans 2,880 cubic feet
An attachment point is 2 feet from the center of gravity and the other attachment point is
6 feet from the center of gravity. What is the correct percentage of weight distribution to each attachment point with the attachment point 2 feet from the center being listed first?
- Ans 75%, 25%
center of gravity is best described as - Ans where all the weight is concentrated
the center of gravity is located below the center of balance. - Ans false
the center of gravity (CG) is always located within the object. - Ans false
Attachment point #1 is 6 feet from the center of gravity (CG). There is a 10,000 lbs. load
attached. What is the correct equation to find the weight distribution for attachment point
#1? - Ans 3 divided by 9 multiplied by 10,000 (3/9 x 10,000)
the center of gravity (CG) will always find it's way directly under the crane hook when lifted off the ground. - Ans true
A 60 degree sling angle will be formed when you match the sling length to the diagonal distance between attachment points. - Ans true
An object has a length of 5 feet, a width of 3 feet, and a distance of 5 feet 6 inches between attachment points. What length sling would you select to ensure the horizontal sling angle was 60 degrees or greater? - Ans 6 feet
to find the sling angle stress - Ans multiply the weight in the attachment point times the
angle factor
the reason test and inspection is required is to... - Ans prevent personal injury identify sub-standard equipment remove unsafe equipment
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