LENGTH MEASUREMENT

Question 1

is a measure of distance

Answer 1

Length

Question 2

is the most extended dimension of an object.

Answer 2

length

Question 3

may be distinguished from height, which is vertical extent, and width or
breadth, which are the distance from side to side, measuring across the object at right
angles to the length.

Answer 3

Length

Question 4

For instance one of the oldest units of length measurement used in the ancient world was the

Answer 4

cubit

Question 5

the length of the arm from the tip of the finger to the elbow

Answer 5

cubit

Question 6

As trade between different places increased,

Answer 6

the need for standard units of length
increased

Question 7

Thus a ruler that is one meter long in one frame of reference will not be one meter long in a reference frame that is moving relative to the first frame

Answer 7

This means the length of an object varies depending on the observer

Question 8

Historically, units of length may have been derived from the

Answer 8

lengths of human
body parts,the distance traveled in a number of paces, the distance between landmarks or places on the Earth, or arbitrarily on the length of some common object

Question 9

In the International System of Units (SI), the basic unit of length is the

Question 10

_____ derived from the metre, are also commonly used units

Answer 10

The centimetre and the kilometre

Question 11

In U.S. customary units, English or
Imperial system of units, commonly used units of length are the

Answer 11

inch, the foot, the yard, and the mile.

Question 12

Units used to denote distances in the vastness of space, as in astronomy, are much longer than those typically used on Earth and include the

Answer 12

astronomical unit, the light-year,
and the parsec.

Question 13

____ is a device used in geometry and technical drawing, as well as the
engineering and construction industries, to measure or draw
straight lines.

Answer 13

A ruler, sometimes called a rule or line gauge

Question 14

is the three-sided ruler used by
architects and readers of blueprints to convert between scaled drawings and the actual dimensions without having
to resort to any mathematical calculations

Answer 14

A scale ruler

Question 15

An__ uses the scale ruler to convert dimensions into a smaller
drawing of a building plan.

Answer 15

architect

Question 16

is a device used to measure the distance between two opposite sides of an object.

Answer 16

A caliper

Question 17

are sometimes referred to as
straight calipers. They have straight legs turned out at the bottom, and are used to measure inside dimensions
such as the inside diameter of a hole or tube

Answer 17

Inside calipers

Question 18

are sometimes called egg calipers
or bow calipers. They are used to measure external diameters, for example, the outside diameter or width of an object.

Answer 18

Outside calipers

Question 19

used in the process of marking out locations.

Answer 19

divider caliper, popularly called a
compass,

Question 20

is also used to measure a distance between two points on
a map.

Answer 20

divider caliper

Question 21

one minute of arc of latitude is
approximately

Answer 21

one nautical mile or 1852 metres

Question 22

are generally used to scribe a line at a set distance from the edge of a workpiece.

Answer 22

Oddleg calipers, Hermaphrodite
calipers, or Oddleg jennys,

Question 23

give a direct reading of the distance
measured with high accuracy and precision

Answer 23

The vernier, dial, and digital calipers g

Question 24

can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws, and in many cases depth by the use of a probe that is attached to the movable head and slides along the centre of the body.

Answer 24

Vernier, dial, and digital calipers

Question 25

used to measure external diameter or width of an object

Answer 25

Outside large jaws:

Question 26

used to measure internal diameter of an object

Answer 26

Inside small jaws:

Question 27

used to measure depths of an object or a hole

Answer 27

Depth probe/rod:

Question 28

scale marked every mm

Answer 28

Main scale (Metric):

Question 29

scale marked in inches and fractions

Answer 29

Main scale (Imperial):

Question 30

gives interpolated measurements to 0.1 mm or better

Answer 30

Vernier scale (Metric)

Question 31

gives interpolated measurements in fractions of an inch

Answer 31

Vernier scale (Imperial)

Question 32

used to block movable part to allow the easy transferring of a measurement.

Answer 32

Retainer:

Question 33

In this instrument, a small, precise rack and pinion drives a pointer on a circular dial, allowing direct reading without the need to read a vernier scale.

Answer 33

Dial CAliper

Question 34

Is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers

Answer 34

A micrometer, sometimes known as a micrometer screw gauge,

Question 35

The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.

Answer 35

micrometer

Question 36

is a tool used to measure gap widths

Answer 36

feeler gauge

Question 37

are mostly used in engineering to measure the clearance between two parts

Answer 37

Feeler gauges

Question 38

They consist of a number of small lengths of steel of different thicknesses with measurements marked on each piece. They are flexible enough that, even if they are all on the same hinge, several can be stacked together to gauge intermediate values.

Answer 38

Feeler Gauge

Question 39

The lengths of steel are sometimes called________ , although they have no sharp edge.

Answer 39

leaves or blades

Question 40

is a block of metal or ceramic with two opposing faces ground precisely flat and parallel, a precise distance apar

Answer 40

A gauge block

Question 41

Standard grade blocks are made of a

Answer 41

hardened steel alloy,

Question 43

while calibration grade blocks are often made of ____ because it is harder and wears less

Answer 43

tungsten carbide or chromium carbide

Question 44

come in sets of blocks of various lengths, along with two wear blocks, to allow a wide variety of standard lengths to be made up by stacking them.

Answer 44

Gauge blocks

Question 45

The thickness of the wring film is about

Answer 45

25 nanometers (0.98 μin).

Question 46

The gauge's nominal length is also known as

Answer 46

interferometric length.

Question 47

n is a geodetic measuring device used for land survey

Answer 47

Gunter's chain

Question 48

It was designed and introduced in 1620 by English clergyman and mathematician

Answer 48

Edmund Gunter

Question 49

either a straightedge or foldable ruler used to measure length, and is especially common in the construction industry

Answer 49

meterstick or yardstick

Question 50

ormal length of a meterstick made for the international market is either

Answer 50

one or two meters

Question 51

while a yardstick made for the U.S. market is typically

Answer 51

one yard (3 feet or 0.9144 meters) long

Question 52

is an instrument for measuring the lengths of arbitrary curved lines

Answer 52

An opisometer, also called a curvimeter, meilograph, or map measurer,

Question 53

line length =

Answer 53

= wheel circumference × teeth counted/teeth on wheel.

Question 54

A simple opisometer consists of a

Answer 54

toothed wheel of known circumference on a handle.

Question 55

The instrument is most commonly used to measure the lengths of roads, rivers and other line features on maps.

Answer 55

chartometer

Question 56

designed for this purpose provide scales reading the measured distance in kilometers and miles.

Answer 56

Opisometers

Question 57

is marked in fractional increments of revolution from a reference position. Thus its current position can be represented as a fraction of a revolution from this reference

Answer 57

The surveyor's wheel

Question 58

As the wheel turns during measurement, it is seen that the wheel sweeps out an angle of ¾ pi radians,

Answer 58

which is equal to 135 degrees or 3/8 of a full turn.

Question 59

is a flexible ruler and used to measure distance

Answer 59

A tape measure or measuring tape

Question 60

is the base unit of length.

Answer 60

The meter (m)

Question 61

What are the 2 international standards?

Answer 61

International System of Units (SI): International Organization for Standardization (ISO):

Question 62

Provides guidelines for the use of the metric system

Answer 62

ISO 1000:

Question 63

Specifies the standard for the tolerances of linear dimensions of mechanical components.

Answer 63

ISO 286:

Question 64

It maintains the International System of Units (SI) and ensures the consistency of measurements worldwide

Answer 64

International Bureau of Weights and Measures (BIPM).

Question 65

It provides standards, calibration, and certification for length measurements in the United States.

Answer 65

National Institute of Standards and Technology (NIST) (U.S).

Question 66

(UK). It is similar role to NIST, providing standards and calibration services in the UK

Answer 66

National Physical Laboratory (NPL)