Practice test C

Question 1, Object weight

What total static load do the two rigging points carry? • 30 ft truss at 12 lb/ft, hung from two 1-ton chain hoists weighing 140 lb each with chain • 12 fixtures at 38 lb each • One multicable at 0.6 lb/ft that runs the full length of the truss and then drops 40 ft to the floor

Question 2, Conversions

An LED wall is listed at 1.5 metric tonnes. About what does it weigh in pounds?

Question 3, Conversions

A cable pick is specified as 15 kg/m. What is that in lb/ft?

Question 4, Components of force

A bridle leg carries 2,000 lb and sits 30° from vertical. What is the horizontal component of that force?

Question 5, Sling length

Using the formula sheet's leg length D = √(ΔX² + ΔY² + ΔZ²), how long is a leg whose beam point is 6 ft east, 8 ft north and 24 ft above the apex?

Question 6, Resultant force

A hand line runs over a block hung from the steel. The pull on the line is 200 lb and the angle between the two parts of the line at the block is 60°. Using F = P sin a ÷ sin(a/2), what force does the block put on the steel?

Question 7, 3-way bridle

A 3-leg bridle hangs from three points at the same height. In plan, A is at (0, 0), B at (20, 0) and C at (10, 15) ft. The apex is at (10, 5), 12 ft below the points, carrying 2,000 lb. What is the tension in leg A?

Question 8, Overhang

A 300 lb speaker hangs 4 ft beyond point 1 on a short truss supported at point 1 and point 2, 12 ft apart. Ignoring the truss's weight, what happens at each point?

Question 9, Shock load

Which change does the most to reduce the shock load if a load drops before being caught?

Question 10, Design factor

A 1/4 in galvanized aircraft cable (7×19, breaking strength 7,000 lb) is being used for an 875 lb load. What design factor is that?

Question 11, Center of gravity

A 1,200 lb LED wall hangs from two picks 8 ft apart. Its center of gravity is 2 ft from the left pick. What does the left pick carry?

Question 12, Indeterminate structures

A continuous truss hangs level from three hoists. If the center hoist is run up a little above the line of the end hoists, what happens?

Question 13, Fall protection

A worker's 6 ft shock-absorbing lanyard is anchored at D-ring height. The absorber can deploy up to 3.5 ft, the harness stretch and D-ring shift is 1 ft, the D-ring is 5 ft above the worker's feet, and you add a 2 ft safety margin. How much clear space is needed below the anchor?

Question 14, Fall protection

Under OSHA, a personal fall arrest system used with a full-body harness must limit the arresting force on the worker to no more than:

Question 15, Reading plans

On a rigging plot drawn at 1/4 in = 1 ft 0 in, two points measure 5-1/2 in apart. How far apart are they?

Question 16, Facility plans

On a structural steel plan, what does W14×30 tell you about a beam?

Question 17, Building limits

The venue allows 2,000 lb per point and 6,000 lb total on any one beam. The plot puts four 1,750 lb points on the same beam. What is the right call?

Question 18, Phasing

On load-in, every hoist on controller 1 runs in the right direction, but every hoist on controller 2 runs backward. What is the most likely cause?

Question 19, Power

Which of the following should be verified before connecting a chain hoist control system to house power? 1. Voltage 2. Phase rotation 3. Rope length 4. Feeder capacity

Question 20, Communication

What is the best communication setup for a multi-hoist lift?

Question 21, Shackles

A shackle rated 9,500 lb is loaded at 90° to its centerline (side loaded). Per Crosby, what is its reduced working load limit?

Question 22, Wire rope clips

Per Crosby's G-450 table, how many clips does a 1/2 in wire rope termination need, and how much turnback?

Question 23, Wedge sockets

How must a wedge socket be installed?

Question 24, Knots

Which knot is tied in the end of a hand line so it can't run out through a block?

Question 25, Carabiners

How should a carabiner be loaded?

Question 26, Shackles

Why is a screw-pin shackle moused (seized with wire) in a permanent or long-term installation?

Question 27, Eye bolts

Per Crosby, a shouldered eye bolt loaded at 45° to its axis keeps what share of its rated load?

Question 28, Secondary safeties

A moving light is clamped to a truss. What else is required?

Question 29, Lift sequence

Put these steps for raising a new truss in order. 1. Bump each hoist to confirm direction and control 2. Raise in stages, rechecking level 3. Float the load and inspect the whole assembly 4. Verify trim

Question 30, Load monitoring

During a lift on four hoists, one load cell drops toward zero while the other three rise. What does it mean?

Question 31, Spotters

What is a spotter's main job during a multi-hoist move?

Question 32, Lifting zone

Who may stand under a load while it's moving?

Question 33, Leveling

Why must level be rechecked periodically while raising a truss on several hoists of the same model?

Question 34, Chain hoists

Before running a double-reeved chain hoist, you see the hook block has flipped over through the chain. What should you do?

Question 35, Trim

What is the best way to verify trim on a truss hanging from four points?

Question 36, Controls

When should the emergency stop function of a hoist control system be tested?

Question 37, Chain bags

Per CM's Lodestar manual, chain in a fully loaded chain container must not fill more than what share of the container's height?

Question 38, Aerial lifts

Working from a boom lift, where must your lanyard be attached?

Question 39, Ladders

An extension ladder gives access to a landing. How far must its side rails extend above the landing surface?

Question 40, Fall protection

Under OSHA general industry rules, when must fall arrest components (harness, lanyard, connectors) be inspected?

Question 41, Truss

Where should a truss be picked?

Question 42, Truss

A truss load table lists an allowable uniformly distributed load (UDL) and an allowable center point load (CPL) for the same span. How do they compare?

Question 43, Block and fall

A block and fall has four parts of line supporting the moving block. Ignoring friction, what pull lifts 400 lb?

Question 44, Slings

What tells you the capacity of a round sling?

Question 45, Chain

Which chain may be used in a sling for overhead lifting?

Question 46, Wire rope

Which of the following call for removing a wire rope sling from service? 1. Birdcaging 2. A missing ID tag 3. Heat damage 4. A light coat of lubricant

Question 47, Wire rope

Compared to a fiber core, an independent wire rope core (IWRC) gives:

Question 48, Wire rope

A sling of 3/16 in galvanized aircraft cable (7×19, breaking strength 4,200 lb) has swaged ends rated at 100% efficiency. What is its WLL at 8:1?

Question 49, Hardware

Which markings does ASME B30.26 require on a shackle?

Question 50, Lever hoists

A lever hoist won't take up the last of the load by hand. What should you do?