OIT Practice and Application 5

Question 1

A CNC program uses the G41 code. What does this command activate?

Accepted Answer

Cutter radius compensation — left

Answer

G41 activates cutter radius compensation to the left of the programmed tool path, offsetting the tool by its radius to cut the correct profile.

Question 2

During a pre-task hazard assessment, a trades worker identifies an unguarded rotating shaft nearby. What is the hierarchy of controls order for addressing this hazard?

Accepted Answer

Elimination → Substitution → Engineering controls → Administrative controls → PPE

Answer

The hierarchy of controls runs from most to least effective: Elimination, Substitution, Engineering controls, Administrative controls, then PPE as the last resort.

Question 3

A millwright is aligning two shafts using a dial indicator rim-and-face method. The face reading shows +0.10 mm at top and the rim reading shows +0.08 mm at bottom. What condition exists?

Accepted Answer

Both angular and parallel misalignment

Answer

A non-zero face reading indicates angular misalignment, while a non-zero rim reading indicates parallel (offset) misalignment; both readings present means both conditions exist.

Question 4

Under Ontario's Electrical Safety Code, what is the minimum working clearance required in front of electrical equipment operating at 120–250 V where energized parts are exposed?

Accepted Answer

0.9 m (900 mm)

Answer

The Ontario Electrical Safety Code requires a minimum working clearance of 900 mm (approximately 3 feet) in front of exposed energized parts at 120–250 V.

Question 5

A steam trap that continuously passes steam (fails open) on a condensate return line will cause which problem?

Accepted Answer

Steam loss and increased energy costs

Answer

A failed-open steam trap allows live steam to pass into the condensate return, resulting in direct steam loss and significantly increased energy costs.

(OIT) Ontario Industrial Trades Certification Practice Test

(OIT) Ontario Industrial Trades Certification Practice Test

OIT Practice and Application 5