This document provides examples of converting between units in the inch and metric systems of measurement. It gives the common units of length for each system and examples of converting between inches and centimeters and between inches and millimeters. Conversions include inside diameters of pipes, lengths of bolts, and various lengths between the systems.

1. Module-1 Principles of Mech Measurements
Review Questions Solved
1. Name two systems of measurement presently used?
1. Inch system
2. Metric system
2. What is the common unit of length in the SI system?
1. mm
2. cm
3. dm
4. m
3. A mechanic measuring the inside diameter of a pipe. The reading was 2 inches.
a. What is the inside diameter of pipe in centimeters?
b. What is the inside diameter of the pipe in millimeters?
a. 2 x 2.54=5.08 cm
b. 2 x 25.4=50.8 m
4. Using the metric rule,a mechanic finds that a particular bolt is 7.62 centimeter
long. What is the length of the bolt in inch?
7.62/2.54 =3 inch
5. Perform the following conversions:
a. 35 mm = 35/25.4 = 1.3779 inch
b. 125 in. = 125 x 25.4 = 3175.0 mm
c. 6.273 in. = 6.273 x 25.4 = 159.334 mm
d. 17 in = 17 x 25.4 = 431.8 mm
e. 0.807 in. = 0.807 x 25.4 = 20.4978 mm
f. 0.05 mm. = 0.05/ 25.4 = 0.00196 inch
g. 1.63 m. = 1.63/0.0254 = 64.172 inch
Or
1.63 x 39.37 inch = 64.172 inch