Sample Questions
Practice Questions with Explanations
Get a feel for the exam format with these sample questions covering key trade competencies, rigging calculations, and safety standards:
Sample Question 1
Using the formula sheet (1 ft x 1 ft x 1 in. = 40.8 lb), calculate the weight of a 4 ft x 8 ft steel plate that is 0.5 in. thick.
- 653 lb
- 326 lb
- 979 lb
- 1,306 lb
Explanation: Area = 4 ft x 8 ft = 32 sq ft. At 1 in. thickness, weight = 32 x 40.8 lb = 1,305.6 lb. For 0.5 in. plate: 1,305.6 lb x 0.5 = 652.8 lb.
Sample Question 2
Using the formula sheet, calculate the tension in each sling leg when lifting a 10,000 lb load with 2 slings of length L = 10 ft and vertical height V = 8 ft.
- 6,250 lb
- 5,000 lb
- 4,000 lb
- 8,000 lb
Explanation: Using Sling tension = (W / number of slings) x (L / vertical L): (10,000 lb / 2) x (10 ft / 8 ft) = 5,000 x 1.25 = 6,250 lb per sling leg.
Sample Question 3
Using the formula sheet (3D + 1, round up to next whole number), calculate the number of wire rope clips needed for 3/4 in. rope.
- 4 clips
- 3 clips
- 5 clips
- 2 clips
Explanation: Clips = 3D + 1 = 3 x (0.75) + 1 = 2.25 + 1 = 3.25. Rounding up to the next whole number gives 4 clips.
Sample Question 4
Using the turn-of-nut table on the formula sheet, what nut rotation is required for a 3/4 in. A325 bolt of length 2-3/4 in. with both faces normal?
- 1/3 turn (120 deg)
- 1/2 turn (180 deg)
- 2/3 turn (240 deg)
- 1/4 turn (90 deg)
Explanation: Bolt length = 2.75 in. 4D = 4 x 0.75 in. = 3.0 in. Since length <= 4D and both faces are normal to the bolt axis, the table specifies 1/3 turn (120 degrees) from snug-tight.
Sample Question 5
A winch pulls with 5,000 lb line tension redirected 90 degrees by a snatch block. What is the resultant load on the snatch block anchor (use the square root of 2 as the load factor)?
- 7,070 lb
- 5,000 lb
- 10,000 lb
- 8,660 lb
Explanation: The two line legs meet at 90 degrees, so the resultant on the anchor = 2 x 5,000 lb x cos 45 degrees = 7,070 lb (the load factor is the square root of 2).
Frequently Asked Questions
Ironworker – Structural/Ornamental (420A) FAQ
How many questions are on the Ironworker – Structural/Ornamental (420A) Red Seal exam?+
The interprovincial Red Seal Ironworker – Structural/Ornamental (420A) exam consists of 120 multiple-choice questions. ExamHub's practice question bank includes 200 questions, and Test Mode delivers a full 120-question timed simulation.
What is the pass mark for the Ironworker – Structural/Ornamental (420A) exam?+
The qualifying pass mark is 70% (84 correct answers out of 120 questions). Candidates are allotted 4 hours (240 minutes) to complete the test.
What topic areas are tested on the Red Seal Ironworker – Structural/Ornamental (420A) exam?+
The exam covers 5 Major Work Activities: Common Occupational Skills (20 Qs), Rigging, Hoisting & Cranes (38 Qs), Structural Steel Erection (20 Qs), Ornamental, Cladding & Machinery (23 Qs), Maintenance & Upgrading (19 Qs).
How does ExamHub's practice mode work?+
Practice Mode gives you instant feedback and explanations after every answer with category filtering. Test Mode delivers a realistic timed simulation with a 4-hour countdown and passing grade evaluation.
Does ExamHub's content match the real exam questions?+
No. These are original practice questions created by ExamHub based on the Red Seal Occupational Standard (RSOS), Skilled Trades Ontario curriculum guidelines, and trade safety regulations. They are designed for study practice and are not copies of actual exam questions.