2026 MILLWRIGHT LEVEL 3 EXAM PAPER
QUESTIONS AND ANSWERS SURE A+
✔✔Which is softer out of a worm and worm wheel - ✔✔Worm wheel
✔✔How much clearance is there between the top of a key and a set screw - ✔✔0.005"
✔✔What does an upper case letter mean in bearing codes - ✔✔Bore size
✔✔What does a lower case letter mean in bearing codes - ✔✔Shaft size
✔✔How do you check for bearing cleanliness - ✔✔A white lint free rag
✔✔How do you clean a bearing - ✔✔2 solvent baths on clean and one dirts
✔✔How much clearance should a ball bearing have - ✔✔A slight drag
✔✔How much clearance should a roller bearing have - ✔✔1/2 the initial clearance
✔✔What is the most accurate way to install a taper lock nut - ✔✔Hydraulic nut and dial
indicator
✔✔What would you use to hold a bearing on to a shaft - ✔✔External snap ring
✔✔What would you use to hold a bearing in a bore - ✔✔Internal snap ring
✔✔What are 3 types of load on a bearing - ✔✔Radial, axial and combination
✔✔Where would a carb bearing be used - ✔✔In high heat applications where greater
thermal growth is required
, ✔✔What does the letter Z mean in a bearing code - ✔✔The bearings shielded
✔✔What do the letter RS mean in a bearing code - ✔✔Rubbing seal
✔✔What does ISO stand for - ✔✔International Organization of Standardization
✔✔What bearing setup would you use to cradle a load - ✔✔Face to Face
✔✔What type of setup you used for to support something over hung - ✔✔Back to back
✔✔What are the last 2 digits in a bearing code - ✔✔The last 2 digits times 5 is the bore
diameter
✔✔What does the first digit in a bearing code represent - ✔✔Rolling element
✔✔What does the second digit mean in a bearing code - ✔✔Service weight
✔✔What is the process of scraping a bearing called - ✔✔Fitting
✔✔How much contact should you have in a Babbitt bearing - ✔✔85%
✔✔What should the width of a shaft key be - ✔✔1/4 shaft diameter
✔✔What is the taper on a taper key - ✔✔1/8" per foot
✔✔What are the 2 stresses on a shaft - ✔✔Torsional and bending
✔✔What is fatigue - ✔✔Repeated stresses
✔✔How should you stagger packing joints - ✔✔90° apart
✔✔How should set screw be spaced - ✔✔90° apart
✔✔Why are lantern rings used - ✔✔To distribute oil
✔✔How are clearances expressed in bearings - ✔✔C1-C5, C1 being the least amount
and C5 being the greatest
✔✔What can be used to cover damage on a shaft - ✔✔Speedy sleeve
✔✔What type of pillow block can take load in any direction - ✔✔Jib joint
✔✔What can you do if a clutch is slipping - ✔✔Increase pressure
QUESTIONS AND ANSWERS SURE A+
✔✔Which is softer out of a worm and worm wheel - ✔✔Worm wheel
✔✔How much clearance is there between the top of a key and a set screw - ✔✔0.005"
✔✔What does an upper case letter mean in bearing codes - ✔✔Bore size
✔✔What does a lower case letter mean in bearing codes - ✔✔Shaft size
✔✔How do you check for bearing cleanliness - ✔✔A white lint free rag
✔✔How do you clean a bearing - ✔✔2 solvent baths on clean and one dirts
✔✔How much clearance should a ball bearing have - ✔✔A slight drag
✔✔How much clearance should a roller bearing have - ✔✔1/2 the initial clearance
✔✔What is the most accurate way to install a taper lock nut - ✔✔Hydraulic nut and dial
indicator
✔✔What would you use to hold a bearing on to a shaft - ✔✔External snap ring
✔✔What would you use to hold a bearing in a bore - ✔✔Internal snap ring
✔✔What are 3 types of load on a bearing - ✔✔Radial, axial and combination
✔✔Where would a carb bearing be used - ✔✔In high heat applications where greater
thermal growth is required
, ✔✔What does the letter Z mean in a bearing code - ✔✔The bearings shielded
✔✔What do the letter RS mean in a bearing code - ✔✔Rubbing seal
✔✔What does ISO stand for - ✔✔International Organization of Standardization
✔✔What bearing setup would you use to cradle a load - ✔✔Face to Face
✔✔What type of setup you used for to support something over hung - ✔✔Back to back
✔✔What are the last 2 digits in a bearing code - ✔✔The last 2 digits times 5 is the bore
diameter
✔✔What does the first digit in a bearing code represent - ✔✔Rolling element
✔✔What does the second digit mean in a bearing code - ✔✔Service weight
✔✔What is the process of scraping a bearing called - ✔✔Fitting
✔✔How much contact should you have in a Babbitt bearing - ✔✔85%
✔✔What should the width of a shaft key be - ✔✔1/4 shaft diameter
✔✔What is the taper on a taper key - ✔✔1/8" per foot
✔✔What are the 2 stresses on a shaft - ✔✔Torsional and bending
✔✔What is fatigue - ✔✔Repeated stresses
✔✔How should you stagger packing joints - ✔✔90° apart
✔✔How should set screw be spaced - ✔✔90° apart
✔✔Why are lantern rings used - ✔✔To distribute oil
✔✔How are clearances expressed in bearings - ✔✔C1-C5, C1 being the least amount
and C5 being the greatest
✔✔What can be used to cover damage on a shaft - ✔✔Speedy sleeve
✔✔What type of pillow block can take load in any direction - ✔✔Jib joint
✔✔What can you do if a clutch is slipping - ✔✔Increase pressure
