Ohio Machinist Level 2 Practice Exam

Ohio Machinist Level 2 Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• Which of the following is the most suitable material for high-speed

cutting tools?

• Aluminum
• High-Speed Steel (HSS)
• Mild Steel
• Brass

HSS maintains hardness at high temperatures and is ideal for cutting at high speeds.

• What is the purpose of a lathe tailstock?
• To rotate the workpiece
• To hold the cutting tool
• To support the free end of the workpiece 1 / 4

• To measure the workpiece

The tailstock provides support to long workpieces, preventing deflection during turning.

• Which measuring instrument is best for measuring internal diameters

with high accuracy?

• Vernier caliper
• Micrometer
• Bore gauge
• Ruler

Bore gauges are specifically designed to measure internal diameters precisely.

• What is the recommended cutting fluid for aluminum milling?
• Dry machining
• Water-soluble oil
• Cutting oil for steel
• Graphite powder

Water-soluble oil helps lubricate and cool aluminum without causing built-up edge.

• In blueprint reading, what does a section line represent?
• Hole location
• Cut surface in section view
• Centerline
• Surface finish 2 / 4

Section lines indicate the material that has been "cut through" in a sectional view.

• Which of the following threads is most commonly used for machine

assembly?

• Square thread
• Buttress thread
• Unified National Thread (UN)
• Acme thread

UN threads are standardized and widely used for mechanical fasteners.

• What is the primary function of a drill press quill?
• Rotate the workpiece
• Move the drill bit up and down
• Lock the table in place
• Measure hole depth

The quill allows precise vertical movement of the drill bit during drilling.

• Which cutting tool geometry reduces tool wear during high-speed

milling?

• Large rake angle
• Negative clearance
• Proper relief angle
• Zero rake angle 3 / 4

A proper relief angle reduces rubbing and heat buildup, prolonging tool life.

• What is the effect of hardening steel?
• Increases ductility
• Increases hardness and strength
• Reduces tensile strength
• Removes residual stress

Hardening steel increases its hardness and tensile strength through heat treatment.

• Which type of grinding wheel is recommended for high-speed

steel tools?

• Aluminum oxide
• Silicon carbide
• Diamond
• Emery

Silicon carbide is effective for grinding high-speed steel due to its hardness.

• Which symbol indicates a surface finish of 32 microinches?
• Circle with line
• Triangle with “16”
• Triangle with “32”
• Square with line
• / 4