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These 10 free BCB questions are organized by exam domain, so you can see how each part of the Basic Conduit Bending blueprint is tested. Reveal the answer and explanation under each question.
The work order requires field-cut pipe threads on the raceway itself. Stock includes ordinary steel EMT, IMC, and RMC. Which material choice supports that fabrication method?
Correct answer: A - IMC or RMC, using compatible listed threaded fittings.
A rack layout places 3/4-inch EMT beside 1-inch EMT. Their outside diameters are 0.922 inch and 1.163 inches, respectively. The drawing requires at least 1/2 inch of clear space between their surfaces. Using 1/16-inch layout increments, what is the smallest center-to-center spacing that satisfies the drawing?
Correct answer: B - 1-9/16 inches
Three test bends made on a Greenlee 1818 reach 90° while loaded and settle to 87° after controlled release. Independent angle checks agree with both readings. The starting zero is correct, the conduit is properly seated, and there is no slipping or damage. What adjustment addresses this repeatable result?
Correct answer: D - Calibrate an overbend allowance on matching material, then verify the unloaded angle.
An EMT rack must be level. The installer zeroes a relative digital angle finder on a support that slopes 4°, then obtains a 0° reading on a straight conduit leg. Before accepting the alignment, which check establishes whether that leg is horizontal?
Correct answer: C - Check the leg against a true horizontal reference, such as a spirit level.
Both bends in an intended vertical offset measure 30° after unloading. Viewed from above, the outgoing straight leg angles away from the incoming leg; neither leg is bowed. What went wrong during fabrication?
Correct answer: C - The conduit rotated out of the intended plane between bends.
An EMT run must cross a wide rectangular duct and return to its original elevation and direction. The drawing calls for a raised straight section spanning the duct, with clearance beyond both edges. Select the bend arrangement that provides this profile.
Correct answer: A - Two opposing offsets with a straight bridge between them.
A 3/4-inch EMT run must rise 6 inches and move 8 inches sideways through a rolling offset; the incoming and outgoing legs must remain parallel. For two 30° bends, use a distance multiplier of 2.0. How far apart should the bend marks be placed?
Correct answer: C - 20 inches
After a batch of 3/4-inch EMT bends, a crew changes a Greenlee 1818 to the correct shoe for 1-1/2-inch EMT. Before loading the larger tubing, which support arrangement belongs with the new setup?
Correct answer: D - The steel roller, outboard support, and matching follow bar.
During inspection of a newly threaded 3/4-inch rigid steel conduit, a 14-threads-per-inch leaf on a thread-pitch gauge fits the thread crests cleanly. The inspection note says, "Correct pitch and taper verified." How should that note be evaluated?
Correct answer: B - The pitch is correct for 3/4-inch rigid conduit, but the gauge does not establish its taper.
While positioning a long steel conduit, an apprentice notices that its free end could contact exposed energized terminals in a nearby open panel. No approved barrier separates the work from the terminals. What takes priority before the conduit is moved again?
Correct answer: D - Stop movement and have authorized personnel control the electrical hazard.
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