Red Seal Mobile Crane Operator (339A) Timed Mock Exam Simulator
Prepare for your Certificate of Qualification (C of Q) exam with our authentic 110-question 4-hour simulation. Built precisely to the National Occupational Standard blueprint with 70% pass threshold verification.
📝 110 Exam Questions
⏱️ 4 Hours (240 Mins)
🎯 70.0% Pass Standard
📊 MWA Diagnostic Scorecard
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2026 RSOS Blueprint Distribution for Mobile Crane Operator (339A)
Major Work Activity (MWA)
Target Questions
Exam Weight
MWA A: Performs common occupational skills
7 Qs
6%
MWA B: Performs hoisting calculations
20 Qs
18%
MWA C: Inspects and maintains crane
14 Qs
13%
MWA D: Performs rigging
13 Qs
12%
MWA E: Plans lift, prepares site and sets up crane
16 Qs
15%
MWA F: Assembles, disassembles and transports crane
15 Qs
14%
MWA G: Operates crane
25 Qs
23%
Total Red Seal Exam Length
110 Questions
100%
Sample Diagnostic Practice Questions
Try these sample questions from our Mobile Crane Operator (339A) question bank. Select an answer to see instant feedback and explanation.
Q1. A 100-tonne hydraulic truck crane is setting up on a compacted granular fill pad beside a new warehouse in Mississauga to erect roof trusses. The pad looks firm, but the lift plan shows outrigger loads of over 40 tonnes at the worst swing position, and the crane arrived with only its bare steel floats. What must be done before the outriggers are set down?
Worked Explanation: Outrigger loads on a bare float can far exceed what compacted fill will carry. Mats or pads of adequate area spread the load so the ground pressure stays below the allowable bearing capacity. Tires must be clear of the ground when the crane is on outriggers. Compacted fill has a limit, and setting the outriggers at mid extension lowers the chart capacity instead of making the float load safe.
Q2. After a full overnight slow charge on a 12-volt flooded crane battery in Kingston, the mechanic tests each cell with a hydrometer. Five cells read 1.280 specific gravity, but cell 4 reads only 1.150. The battery has been slow to crank the engine for a week. What does this result show?
Worked Explanation: Healthy cells read within about 0.050 of each other. A cell 0.130 lower than the rest after a full charge is shorted or dead and cannot be recovered, so the battery is replaced. Adding acid is not the fix, a healthy battery has no such gap, and a drive does not revive a dead cell.
Q3. The outrigger box of a telescopic crane is positioned on the frame in Brandon, and the fittings have been wiped clean. The bolts and the hose couplers are laid out, and the manual has a tightening value. The crew's lead hand has gone for lunch. What is the right way to finish the job?
Worked Explanation: Fasteners are fitted to the manual's value, then hoses and wiring are connected and the jack is tested. Testing before fastening can twist the box, all the fasteners carry working loads, and over-tightening can stretch or break a bolt.
Frequently Asked Questions — Red Seal Mobile Crane Operator (339A)
Essential examination guidelines, format specifications, and pass requirements for Canadian Mobile Crane Operator (339A) candidates.
What is the passing score for the Red Seal Mobile Crane Operator (339A) exam?
The passing grade across Canada is strictly 70%. On a 110-question examination, you must correctly answer at least 77 questions to earn your Interprovincial Red Seal endorsement.
How many questions are tested and what is the time limit?
The official examination contains 110 multiple-choice questions. Candidates are given 4 hours (240 minutes) to complete the exam, allowing an average of 2.2 minutes per question.
How is this mock exam calibrated to the 2026 RSOS?
Our simulator strictly mirrors the official Canadian Red Seal Occupational Standard (RSOS). Questions are proportional to the actual Major Work Activity (MWA) weighting tested in provincial examination centers, covering trade safety, tools, installations, diagnostics, and code compliance.
What feedback do I receive upon completing the simulator?
You receive an immediate score breakdown by Major Work Activity, highlighting your areas of strength and weakness. The AI Journeyperson Tutor provides detailed procedural and code citations for every question so you understand the technical reasoning behind every correct answer.
Free Study Guide, Formula Reference & 10-Question Readiness Quiz
Want to review Mobile Crane Operator (339A) formulas and take a free 10-question diagnostic quiz first?
Visit our main Red Seal Mobile Crane Operator (339A) Practice Test & Study Guide Hub for the free 10-question readiness quiz, 30-question printable PDF, worked math examples, and 2026 RSOS code reference sheet.