Practice Exam Questions And Correct

NIMS Machining Level I Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a micrometer in machining?

a) Measuring surface roughness

b) Measuring small dimensions with high accuracy

c) Cutting material precisely

d) Aligning machine spindles

Rationale: Micrometers are precision tools used to measure small

dimensions (such as diameters and thickness) accurately to within thousandths of an inch.

• Which of the following is a common unit of measurement used on

micrometers? 1 / 4

a) Centimeters

b) Thousandths of an inch (0.001")

c) Millimeters only

d) Degrees

Rationale: Micrometers typically read in thousandths of an inch for fine

measurement control.

• What is the main function of a lathe machine?

a) Cutting external threads only

b) Milling flat surfaces

c) Rotating a workpiece for cutting, facing, and turning operations

d) Boring holes in stationary workpieces

Rationale: A lathe rotates the workpiece against a cutting tool for turning,

facing, and threading.

• What does RPM stand for in machining?

a) Revolutions Per Meter

b) Relative Power Motion

c) Revolutions Per Minute

d) Rotations Per Measurement

Rationale: RPM indicates how many times a spindle or workpiece rotates in

one minute. 2 / 4

• Which cutting tool material can withstand the highest temperatures?

a) High-speed steel (HSS)

b) Carbon steel

c) Carbide

d) Tool steel

Rationale: Carbide tools maintain hardness and performance at higher

cutting temperatures.

• When using a micrometer, what is the correct technique for final

adjustment?

a) Tighten with full force

b) Use the spindle directly

c) Use the ratchet stop

d) Turn the thimble quickly

Rationale: The ratchet stop ensures consistent pressure, preventing damage

and ensuring accurate measurement.

• What is the function of the cross slide on a lathe?

a) Controls spindle speed

b) Engages the half-nuts

c) Moves the cutting tool perpendicular to the work axis 3 / 4

d) Rotates the chuck

Rationale: The cross slide provides tool movement across the diameter of

the workpiece.

• What is the formula for calculating cutting speed (in feet per minute)?

a) RPM × Diameter × π

b) RPM ÷ Diameter × 12

• (π × Diameter × RPM) ÷ 12
• (RPM × Diameter) ÷ π

Rationale: Cutting speed = (π × D × RPM) / 12, where D is in inches.

• Which type of machining operation is used to reduce the diameter of a

workpiece?

a) Facing

b) Drilling

c) Turning

d) Tapping

Rationale: Turning removes material along the length to reduce diameter.

• What is the purpose of a tailstock on a lathe?

a) Holds the tool post

b) Supports the workpiece or holds drilling tools

• / 4