Question 1
A crushing circuit is rated at 1,250 tonnes per hour. Across a 12-hour shift it operates at 88% availability. How much material is processed during the shift?
Show answer & explanation
Correct answer: A - 13,200 tonnes
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A crushing circuit is rated at 1,250 tonnes per hour. Across a 12-hour shift it operates at 88% availability. How much material is processed during the shift?
Correct answer: A - 13,200 tonnes
A site rule states: 'If a task involves working at height, a permit must be issued before work begins.' A supervisor confirms that no permit was issued for a particular task. Which conclusion MUST be true?
Correct answer: C - The task did not involve working at height
Which number completes the sequence: 4, 7, 13, 22, 34, ?
Correct answer: D - 49
After a 15% reduction, a component now costs $68.00 per unit. What was the cost per unit before the reduction?
Correct answer: B - $80.00
During a pre-start check you find that an isolation control required for a task carrying a fatal risk has not been verified. The crew is behind schedule and your supervisor is off site. Which action is MOST consistent with Rio Tinto's stated values?
Correct answer: A - Do not begin the task, and escalate so the control can be verified
A site report states: 'Haul truck mechanical availability reached 91% this year, up from 87% last year. The improvement is attributed to a revised preventive maintenance schedule introduced in January. Two additional trucks joined the fleet during the same period.' Based only on this passage, which statement is best supported?
Correct answer: D - Availability rose by four percentage points
Three operations reported annual output as follows - Site A: 4.2 Mt, Site B: 6.3 Mt, Site C: 3.5 Mt. Site B's output represents approximately what share of the combined total?
Correct answer: C - 45%
All operators certified for the loader have completed the confined-space module. Some employees who have completed the confined-space module work night shift. Which conclusion MUST be true?
Correct answer: B - At least one employee has completed the confined-space module
Four gears are meshed in a single line: Gear 1 drives Gear 2, which drives Gear 3, which drives Gear 4. If Gear 1 rotates clockwise, how does Gear 4 rotate?
Correct answer: A - Anticlockwise, because meshed gears alternate direction
In a batch-coding system these sequences are valid: 4-9-16, 9-16-25, 25-36-49. These are not valid: 4-9-15, 9-16-36, 16-36-49. Which of the following is a valid sequence?
Correct answer: D - 36-49-64
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