Caliper Assessment Vernier Measurement 3

Question 1

If the zero of the vernier scale is to the LEFT of the zero of the main scale when the caliper is closed, the instrument has:

Accepted Answer

Negative zero error

Answer

When the vernier zero falls left of the main scale zero, the caliper reads less than the true value — this is negative zero error.

Question 2

A machinist measures the same part five times with a vernier caliper and gets: 12.14, 12.16, 12.14, 12.15, 12.15 mm. What is the average reading?

Accepted Answer

12.148 mm

Answer

(12.14+12.16+12.14+12.15+12.15) ÷ 5 = 60.74 ÷ 5 = 12.148 mm.

Question 3

Which vernier caliper graduation allows the finest possible resolution?

Accepted Answer

50-division vernier (0.02 mm)

Answer

A 50-division vernier yields the smallest least count of 0.02 mm among the common types listed.

Question 4

A technician corrects for a positive zero error of +0.06 mm. The uncorrected reading is 25.34 mm. What is the true measurement?

Accepted Answer

25.28 mm

Answer

True value = uncorrected reading − positive zero error = 25.34 − 0.06 = 25.28 mm.

Question 5

On an inch-based vernier caliper with 25 vernier divisions spanning 0.600 inch (main divisions = 1/16 in), what is the least count in inches?

Accepted Answer

0.001 in

Answer

Standard inch vernier calipers are typically graduated to 0.001 inch (25 divisions over 0.025 inch range).

Caliper Assessment Practice Test