Intermediate Rigging Exam Questions with Right Solutions Graded A+.

  What is the distance from an uncompacted soil - Answer: 1.5 ×depth What is the distance from compacted soil - Answer: 1×depth How far past tracks must mats be - Answer: 2' Name 2 methods for cribbing - Answer: 1) area of float ×3= blocking area 2) crane capacity ÷5= blocking area How level must cranes be - Answer: 1% or .57° What is the formula for leverage - Answer: Weight × distance = weight × distance How far must you type off the crane - Answer: 2' from the counter weights What is the wind speed that stops hoisting operations - Answer: 25-30 MPH At what speed do you stop hoisting personnel - Answer: 20 MPH When is side loading okay - Answer: Only with a freely suspended load What is effective weight - Answer: Everything below the boom tip Who must sign off on new signals - Answer: The operator, signal person, lift director What is the best tag line to use for work near powerlines - Answer: Polypropylene What does it mean when you have localized narrowing of outside diameter of wire rope - Answer: Broken core What is RRL - Answer: Right regular lay What is EIPS - Answer: Extra improved plow steel What is IWRC - Answer: Independent wire rope core What percentage of diameter can wire rope not go below - Answer: 95% Gross capacity is the same as - Answer: Allowable line pull Gross capacity- deductions equals - Answer: Net capacity What is the capacity for crane on outriggers, tire, track - Answer: Outriggers= 85% Tires=75% Tracks=75% What does everything above the bold line on a load chat mean - Answer: More likely to break What does everything below the bold line on a load chat mean - Answer: More likely to tip over What is the safety factor for slings - Answer: 5 What is the safety factor for chains - Answer: 4 What grade must the steel chain be for lifting operations - Answer: 8/ 80/ 800 How many broken wires are required to make a standard running rope unusable - Answer: 3 per strand per lay, 6 random per lay How many broken wires are required to make a rotation resistant running rope unusable - Answer: 2 per strand per 6 rope diameters, 4 per strand per 30 rope diameters How many broken wires are required to make a standing rope at end fittings unusable - Answer: 1 How many broken wires are required to make a standing rope at mid area unusable - Answer: 2 How many broken wires are required to make a wire rope sling unusable - Answer: 5 per strand per lay, 10 random per lay What is the sling stress for 90° - Answer: 1.000 What is the sling stress for 60° - Answer: 1.155 What is the sling stress for 45° - Answer: 1.414 What is the sling stress for 30° - Answer: 2.000 What is the sling stress for 5° - Answer: 11.490 What is ANSI standard for hook twist opening and wear - Answer: Twist 0° Opening 5% Wear 10% What is OSHA standard for hook twist opening and wear - Answer: Twist 10° Opening 15% Wear 10% What is the safety factor for rotation resistant wire rope - Answer: 5 What is the safety factor for standard wire rope - Answer: 3.5 How must eye bolts be placed on a load - Answer: Parallel What is the minimum depth an eye bolt must be - Answer: 1.5×diameter of bolt You must reject a bean clamp if - Answer: 15% of normal opening eye bent worn eye capacity unreadable Reject plate clamps if - Answer: Changes in opening or teeth Cracks Loose or damaged rivets Lift eye damaged Excessive rust Capacity unreadable Reject chains if - Answer: 15% wear 5% stretch What do you drop the cranes capacity to for tandem lift - Answer: 75% What is a sheet bend used for - Answer: To combine the end two ropes of current diameters What temperature can alloy chain steel be used - Answer: Up to 500°F What temperature can synthetic web sling be used - Answer: 180°F At what length are loads required to have a minimum of 2 attachment points - Answer: 12' or longer What angle should your choker be at - Answer: 120° What is SLL - Answer: Safe load limit What is WLL - Answer: Working load limit Sling tension - Answer: Weight÷ #of slings×load angle factor What is the design factor for Shackles over 150 - Answer: 4 What do swivel rings need - Answer: Torque value How do you find the load factor and weight distribution - Answer: Sling tension= Sling length (L)÷ sling height (H)× share of load weight L÷H× share of load weight How to find start of loads from known runs - Answer: 1) length run side 1 (R1)+ R2= total span (TS) 2) R2÷TS= Percentage (P) 3) P×W= share of load on side A 4) R1+R2=TS 5) R1÷TS=P 6)P×W= share on side B How to figure center of gravity from known weights - Answer: 1) W1+W2= total weight (TW) 2) W2÷TW=P 3) P×span (S)= center of gravity (CG) in ft from A 4) W1+W2=TW 5) W1÷TW=P 6) P×S= CG in ft from B What is the force required to move a load on level ground - Answer: Force required to move load (F)=coefficient of friction (CF)×W F=CF×W What is the force required to move a load up hill - Answer: F=[CF×run horizontal length feet(R)÷ length of ramp in feet (L)×W]+[W×height in feet(H)÷(L)] F=[CF×R÷L×W]+[W×H÷L] What is the force required to move a load down hill - Answer: F=[CF×R÷L×W]-[W×H÷L] When using shackles and other rigging for personnel lift how much do they have to be rated for - Answer: 5 times the load Gross capacity - Answer: Capacity in the load chart Net capacity - Answer: Gross minus deductions