Module-2 Basic Measurement Review Questions Solved

1. How metric rules are usually graduated?

0.5 mm and 1mm

2. Name four types of steel rules used in machine shop work. a. International Fractional inch b. International Decimal inch c. Metric

3. State what graduated scale on a steel rule should be used to measure each of

the following dimensions: a. 3 1/64″ : International Fractional inch b. 2 19/32″: International Fractional inch c. 5.01″: International Decimal inch d. 14.08″: International Decimal inch e. 75 mm: Metric f. 10.7 mm: Metric

4. Indicate three conditions that produce errors in reading measurements on a steel

rule?

a. Parallax error b. Reading graduation error c. Manipulation error d. Worker bias error

5. Identify the tool which you may use for taking the following measurements:

a. The diameter of a hole:

Caliper rule/Caliper inside /Center head

b. The distance from the face to the bottom of a hole: Depth gauge

c. The vertical height to the bottom of a dovetail slot: Depth gauge

6. Study the illustration of the 150 mm scale. Four points are marked for reading.

For each point, write the correct reading in the blank space of the corresponding number listed below.

A. 10mm B. 12mm C. 107.5mm D. 135mm

7. Study the illustration of the 6-inch scale. Five points are marked for reading. For

each point, write the correct reading in the blank space of the corresponding number listed below.

A. 1 16/64 B. 2 10/32 C. 3 12/32 D. 4 17/64 E. 5 25/64

8. In the space provide, give the fractional dimensions labeled (a) through (z) to their lowest reduced number.

A- 1/16 B- 3/16 C- 5/16 D- 7/16 E- 9/16

F- 11/16 G- 13/16 H- 15/16 I- 1/8 J- 2/8

K- 3/8 L- 4/8 M- 5/8 N- 6/8 O- 7/8

P- 1’’ Q- 1/32 R- 3/32 S- 5/32 T- 7/32

U- 9/32 V- 11/32 W- 1/64 X- 3/64 Y- 5/64

Z- 7/64

11. State the purpose of

a. Hook rules: Hook rules, are used to make accurate measurements from a shoulder, or edge of a workpiece.

b. Short length rule: To measure openings and hard to reach locations, where an ordinary ruler can’t used.

c. Caliper rule: For inside and outside callipering.

d. Flexible tape: For making long linear measurements because of their flexibility.

e. Depth gauge: To measure the depth of holes, slots, grooves and recesses.

12. Name two types of outside calipers a- Spring calipers b- Firm joint calipers 13. What is the procedure of using an outside caliper?

Using Calipers for Outside Measurement

I. Place the caliper on the work perpendicular to the workpiece axis.

II. Hold the top of the caliper (spring) lightly.

III. The diameter is correct when the caliper will just slide over the work by its own weight.

IV. Find the distance across the caliper legs. 14. State the purpose of combination set. a- Square head: Marking 45o,90o angles /parallel lines.

b- Center head: Measuring diameter and marking center lines on round objects.

c- Protractor head: To measure and marking angles. 15. What is the purpose of surface plate?

The surface plate is combined with other measuring equipment. It is used to provide a reference surface.