Free Red Seal Machinist Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Machinist Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A machinist is applying lockout before maintenance on an electrically powered machine. Which device is an energy-isolating device rather than a control-circuit switch?

   1. A.A manually operated disconnect switchCorrect answer: A
   2. B.A machine start push button
   3. C.A machine stop push button
   4. D.A machine selector switch

   Explanation: The occupational standard states that "lock-out and tag-out procedures are complied with according to regulations and company policies". CCOHS identifies a manually operated disconnect as an isolating device and distinguishes push buttons and selector switches as control devices.

   Reference: Red Seal Occupational Standard – Machinist — A-1.01.01P, lines 1599–1607

2. 2A disassembly instruction specifies that a retaining ring must be removed before its bearing, and the bearing before its shaft. Which sequence follows the documentation?

   1. A.Remove the ring, then the bearing, then the shaftCorrect answer: A
   2. B.Remove the ring, then the shaft, then the bearing
   3. C.Remove the bearing, then the ring, then the shaft
   4. D.Remove the shaft, then the bearing, then the ring

   Explanation: The occupational standard says that "documentation is read to assess required disassembly". Applying the two stated precedences gives ring → bearing → shaft; every other sequence violates at least one of them.

   Reference: Red Seal Occupational Standard – Machinist — B-7.01.01P, lines 6340–6345

3. 3During a straight cut through stock of constant section on a vertical band saw, how should the workpiece be fed into the blade?

   1. A.With consistent cutting pressureCorrect answer: A
   2. B.With pressure increasing through the cut
   3. C.With pressure decreasing through the cut
   4. D.With pressure alternating through the cut

   Explanation: The standard calls for "consistent cutting pressure to protect blade and provide an efficient cut". A steadily increasing, steadily decreasing or alternating pressure does not maintain the stated consistent feed during this straight cut.

   Reference: Red Seal Occupational Standard – Machinist — C-9.01.01P, lines 7599–7607

4. 4A large workpiece is fixed in position while several holes must be reached by moving the spindle along a horizontal arm. Which drill press type is designed for this arrangement?

   1. A.Radial-arm drill pressCorrect answer: A
   2. B.Sensitive bench drill press
   3. C.Gang drilling machine
   4. D.Magnetic-base drill press

   Explanation: The standard states that "type of drill press is determined according to workpiece and operations to be performed". The manufacturing laboratory text identifies the radial-arm machine as suited to large workpieces with a spindle that moves along the arm; the other machines use different arrangements.

   Reference: Red Seal Occupational Standard – Machinist — D-10.01.02P, lines 7938–7945

5. 5At the start of a lathe facing operation, the machinist makes a reference cut and measures the workpiece axially before removing the remaining excess. Which dimension does this establish?

   1. A.The workpiece starting lengthCorrect answer: A
   2. B.The workpiece starting diameter
   3. C.The workpiece taper per unit length
   4. D.The workpiece thread lead

   Explanation: For facing, the standard states that the "workpiece is cut and measured to establish starting length". An axial measurement between the end faces establishes length, not diameter, taper or thread lead.

   Reference: Red Seal Occupational Standard – Machinist — E-13.01.03P, lines 10192–10199

6. 6Before machining a flat surface on a conventional mill, a machinist touches the cutter to the workpiece surface. Which setup value is established by that contact?

   1. A.A reference position for the surfaceCorrect answer: A
   2. B.The cutting edge’s radial runout
   3. C.The cutter’s nominal outside diameter
   4. D.The spindle’s angular speed

   Explanation: The standard says the workpiece surface is touched off by the cutter "to establish a reference point". The contact does not establish cutter runout, cutter diameter or spindle speed.

   Reference: Red Seal Occupational Standard – Machinist — F-15.01.02P, lines 12810–12818

7. 7A clean, dry bonded grinding wheel larger than 10 cm is ring-tested before mounting. What is the purpose of this test?

   1. A.Detect cracks or other damage in the wheelCorrect answer: A
   2. B.Determine the wheel’s abrasive grain size
   3. C.Measure the wheel’s static out-of-balance
   4. D.Determine the wheel’s maximum rated speed

   Explanation: The occupational standard says the "grinding wheel is inspected and ring tested for defects". CCOHS explains that a ring test checks for cracks or damage rather than determining grain size, balance or maximum rated speed.

   Reference: Red Seal Occupational Standard – Machinist — G-16.04.01P, lines 14787–14794

8. 8A CNC setup sheet specifies the part origin at the lower-left corner of the top face, with X positive to the right and Y positive away from the operator. Which record matches that datum and orientation?

   1. A.Lower-left origin; X right; Y awayCorrect answer: A
   2. B.Lower-left origin; X left; Y away
   3. C.Lower-right origin; X right; Y away
   4. D.Upper-left origin; X right; Y toward

   Explanation: The standard lists "part origin and orientation" as information required for CNC machining. Only the first record preserves all three directions stated in the setup sheet; the others change the origin or an axis direction.

   Reference: Red Seal Occupational Standard – Machinist — H-18.01 range of variables, lines 16178–16185

9. 9A drawing gives the permitted upper and lower sizes of a machined feature. What is the difference between those limits called?

   1. A.Basic size
   2. B.Size toleranceCorrect answer: B
   3. C.Actual size
   4. D.Upper deviation

   Explanation: The occupational standard lists "drawing features include: nominal size, limits and fits, tolerance, allowance, scale, symmetry, standard and GD&T". The NIST comparison defines size tolerance as the difference between maximum and minimum limits; basic size, actual size and upper deviation describe different dimensions.

   Reference: Red Seal Occupational Standard – Machinist — A-2.01 range of variables, lines 1983–1988

10. 10A machinist needs to cut an external thread by hand on a cylindrical workpiece. Which tool is used for this operation?

    1. A.A threading dieCorrect answer: A
    2. B.A threading tap
    3. C.A hand reamer
    4. D.A boring bar

    Explanation: The machine-shop guide states that "THREADING is cutting external threads by hand and is done with a die"; it identifies tapping as cutting internal threads. A reamer and a boring bar are used on holes, not for this external threading operation.

    Reference: University of Wyoming Machine Shop Equipment and Best Practices — Threading and tapping, lines 151–157