Comprehensive practice questions based on official guidelines & regulatory standards
Practice on the go and jump straight back to where you left off.
Exam Blueprint & Overview
Practice Questions
Question 1
A mobile crane is configured to hoist precast panels adjacent to an energized overhead power line operating at 115 kV. What is the minimum regulatory limit of approach clearance that must be maintained from the conductor?
Explanation: O. Reg. 213/91 s. 188(2): no object may be brought closer to an energized overhead conductor rated 750 V or more but no more than 150,000 V than 3 m (10 ft). A 115 kV line falls in this band.
Question 2
A signaller extends one arm with the palm down and moves the hand rapidly back and forth by bending at the elbow. What action must the operator take?
Explanation: IHSA hand signals: extending an arm, palm down, and moving the hand rapidly back and forth is the stop (emergency stop) signal. The operator must halt all crane movement immediately, and anyone who sees an unsafe condition may give this signal.
Question 3
A crane lift plan calculates a maximum outrigger vertical reaction force of 80,000 lbs. The operator places a 4 ft by 4 ft timber mat beneath the outrigger float. What is the average ground bearing pressure exerted on the soil?
Explanation: Mat area equals 4 ft × 4 ft = 16 sq ft. Ground bearing pressure P = Force / Area = 80,000 lbs / 16 sq ft = 5,000 psf (or 34.7 psi).
Question 4
A symmetrical load weighing 20,000 lbs is hoisted using a two-leg wire rope bridle sling configured at a 60-degree horizontal sling angle. What is the calculated tension in each sling leg?
Explanation: Load per leg = 20,000 / 2 = 10,000 lbs. Leg tension = 10,000 / sin(60°) = 10,000 / 0.866 ≈ 11,550 lbs per leg.
Question 5
A mobile crane load chart indicates a gross capacity of 28,000 lbs at the planned boom length and radius. Deductions include a main block (1,200 lbs), rigging (400 lbs), headache ball on the whip line (350 lbs), and a stowed jib (800 lbs). What is the crane's net lifting capacity?
Explanation: Total deductions = 1,200 + 400 + 350 + 800 = 2,750 lbs. Net Capacity = Gross Capacity - Deductions = 28,000 - 2,750 = 25,250 lbs.
FAQ
The Interprovincial Red Seal Certificate of Qualification exam assessing competency in mobile crane operation (hydraulic, lattice boom, rough terrain), load chart calculations, rigging, and jobsite safety.
The interprovincial Red Seal exam for Mobile Crane Operator has 110 multiple-choice questions, requires 70% to pass, and allows up to 4 hours (source: red-seal.ca exam information for the trade). ExamHub's Test Me draws a 110-question practice test with a 240-minute timer to match.
Candidates must score 70% or higher to earn their Red Seal endorsement.
As the horizontal sling angle decreases (sling becomes shallower), sling tension rises sharply (e.g. at 30 degrees, tension in each leg of a two-leg sling equals the full load weight, 2.0 times its share).
During a lift over a corner, up to 80% to 100% of the total combined weight (crane gross weight plus suspended load) can be concentrated on a single outrigger pad.