Practice test B

Question 1, 2-way bridle

A symmetric bridle hangs from beams 16 ft apart with the apex centered 6 ft below them. Load: 1,200 lb. What is the tension in each leg?

Question 2, 2-way bridle

For the same bridle, what horizontal force pulls each beam toward the other?

Question 3, High/low bridle

Beam A is 50 ft high and beam B is 48 ft high; they're 10 ft apart. The apex is at 40 ft, 4 ft horizontally from A. Load: 1,000 lb. What is the tension in leg A?

Question 4, Sling length

In the same high/low bridle, how long is leg A (ignoring hardware)?

Question 5, Conversions

A load cell reads 2 kN. What is that in pounds-force?

Question 6, Conversions

A scenic piece weighs 3,500 lb. What is that in kilograms?

Question 7, Design factor

A wire rope has a breaking strength of 4,200 lb. With a 10:1 design factor, what is the WLL?

Question 8, Design factor

You need a sling with a WLL of 1,500 lb. The termination is 90% efficient and you are using an 8:1 design factor. What minimum rope breaking strength is required?

Question 9, Shock load

A 500 lb load drops 6 in and is stopped in 1 in. What is the peak force?

Question 10, Beam loads

A 30 ft simple span carries 1,000 lb at 10 ft and 600 lb at 20 ft, measured from the left. What is the left reaction?

Question 11, Cantilever

A 30 ft truss (20 lb/ft) hangs from points at 0 ft and 24 ft. A 150 lb fixture sits at the 30 ft end. What does the point at 24 ft carry?

Question 12, Indeterminate loads

A continuous truss with a 3,000 lb uniform load hangs from four evenly spaced points. About how much does each inner point carry?

Question 13, Tilting

An LED panel has pick points 4 ft apart. How much higher must the upstage pick be than the downstage pick to tilt the panel 15°?

Question 14, Geometry

A symmetric bridle leg runs 5 ft horizontally and 12 ft vertically. What is the included angle between the two legs?

Question 15, Sling angles

A 1,000 lb load hangs from a symmetric 2-leg sling with each leg at 30° from horizontal. What is the tension in each leg?

Question 16, Fleet angle

What is a commonly cited maximum fleet angle for a smooth (ungrooved) drum?

Question 17, Hoists

Compared to single-reeved, a double-reeved chain hoist with the same motor has:

Question 18, Hardware

Why is a protective pad used when a sling is choked or basketed around a steel beam?

Question 19, Inspection

Which is NOT a reason to remove wire rope from service?

Question 20, Controls

After an emergency stop is activated on a hoist control system, what should happen?

Question 21, Communications

During a lift, who may call a stop?

Question 22, Fall protection

A personal fall arrest system should typically limit free fall to no more than:

Question 23, Drawings

Which facility drawing shows beam sizes and locations for planning rigging points?

Question 24, Indeterminate loads

Why are load cells especially valuable on a truss hung from four or more points?

Question 25, Slings

Roughly what percentage of vertical capacity does a round sling have in a choker hitch?