Red Seal Mobile Crane Operator (339A) Official 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: Common Occupational Skills (안전·수신호·기록부)
7 Qs
6%
MWA B: Hoisting Calculations (하중계산·로드차트·슬링장력)
20 Qs
18%
MWA C: Inspects & Maintains Crane (LMI·와이어로프·점검)
14 Qs
13%
MWA D: Performs Rigging (샤클·슬링체결·리깅기구)
13 Qs
12%
MWA E: Lift Planning & Setup (아웃트리거·지내력·양중계획)
16 Qs
15%
MWA F: Assembly & Transport (붐조립·웨지소켓·수송)
15 Qs
14%
MWA G: Operates Crane (크레인조종·풍속제한·인양안전)
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-ton mobile crane is setting up on compacted granular fill over a culvert. The existing outrigger pads are 1.2m x 1.2m. The certified ground bearing capacity for this area is rated at 100 kPa. The crane manufacturer's outrigger load chart indicates a maximum outrigger reaction force of 600 kN for the planned lift configuration. To ensure safe operation and prevent ground failure, what is the *minimum* required area for each outrigger mat to adequately support the crane without exceeding the ground bearing capacity?
Worked Explanation: The required bearing area is calculated by dividing the maximum outrigger reaction force by the allowable ground bearing capacity. Required Area = Force / Pressure. Given Force = 600 kN = 600,000 N. Given Pressure = 100 kPa = 100,000 N/m². Therefore, Required Area = 600,000 N / 100,000 N/m² = 6 m². This calculation is fundamental to pre-lift hazard assessment and ensuring crane stability.
Q2. During a pre-shift inspection, a crane operator notes that the windshield wipers on the mobile crane are operational, but the rubber blades are cracked and brittle, leaving significant streaks and obscuring vision when wet. The weather forecast indicates a high chance of rain later in the day. What is the operator's primary responsibility?
Worked Explanation: Clear visibility is paramount for safe crane operation, especially in adverse weather conditions. Defective windshield wipers that impair visibility constitute a safety hazard. According to general OHS principles and the importance of pre-operational checks, any deficiency that compromises safe operation requires the equipment to be taken out of service until repaired. Operating with impaired visibility is a direct violation of safe operating practices.
Q3. After the hook block has been properly secured for highway travel, what additional step is crucial to prevent issues with the wire rope during transit?
Worked Explanation: After securing the hook block, it is crucial to ensure the wire rope itself is properly managed. This involves verifying that the minimum required number of wraps (typically 3-5) remains on the hoist drum and that the rope is secured to prevent unspooling or 'bird-caging' during vibration and movement. This often involves a rope tie-down or ensuring the hoist brake is engaged and holding firmly. Loosening the brake (A) or disconnecting the rope (D) would be unsafe and impractical. Lubrication (C) is a maintenance task, not a travel securement procedure.