Adam's Stuff

yafiriyo's version from 2015-09-18 06:34

Chapter 2

Question Answer
Which of the following describes a figure with four sides, each of which is 2.5 inches in length?parallelogram
The principal dimensional measurement is length. Which of the following is the best definition of length?The number of units of measurement that separates two points
Which of the following terms is not essential to defining a length measurement?reference point, unit of measurement, measured point
In which one or more of the following characteristics does a dimension differ from a length?a dimension is an intended size, whereas length is a measured size
The primary purpose of dimensional measurement is tocommunicate the designer's intent
Identify each of the following situations in which dimensional measurement is NOT neededhand-fitting one part to work in conjunction with another
When measurements are repeatedly taken on the same unit, the extent to which an instrument replicates its measurement isAccuracy
Which of the following best describes the reference point?Point at which the measurement begins
What is the name for the end of the measurement?measured point
Part features designate the portion of a part that may considered separately from the part itself --is this true or false?TRUE
How many 0.001 inches are there in one inch?1,000
Which of the following defines an edge?the intersection of a plane with another plane
Which of the following best describes male features?features bounded by outside dimensions
if 1mm = 0.0394 inches, 700 mm equal how many inches?27.58
Accuracy is the measure ofconformity
Which is the following is most closely related to precision?refinement of measurement readings
Which of the following does reliability depend on ?both accuracy and precision
Tolerances are specified for machined parts for which of the following reasonsto ensure proper fit between mating parts
What is the chief similarity between the use of this first recorded standard and present-day practices?requirement that working standard agree with the master standard
Why have light waves replaced metal bars for the master standards of length?light wave standards are more readily reproducible to greater accuracy than metal bars
which of the ways that measurement systems can be compared?metrological superiority, computational advantage, and communications ability
Round 25.7853901 to two significant digits25.79
This describes the four most essential qualities of a measurement systemoptimum measuring ability, minimum errors, minimum time required to measure, minimum cost
decimal inch system benefitsconvertability in and out of the metric system is easy, rounding off is easier than it is with the english system using fractions, the finest division is close to the minimum resolving power of the human eye
Which of the following explains the best reason for rounding off?elimination of meaningless digits

Chapter 3

Question Answer
Maximum material conditionM (inside circle)
least material conditionL (inside circle)
concentricitycircle in a circle
cylindricitycircle with one line on each side

Chapter 5

Question Answer
Scaledivided in proportion to a unit of length
Ruledivisions of a rule that are units of length
advantages of scaleenables large articles to be drawn on small sheets of paper and small articles to e magnified to fit large sheets of paper
this may be either a measuring instrument of measuring edge of a scaled instrumentscale
scale subdivisionsdiscrimination
attachments on scaled instruments do thisfacilitate measurement but add errors
when should interpolation be used?whenever an instrument with finer divisions is not available
steel rule has these sources of errorinherent instrument errors, manipulative error bias, and observational error
Bias reduces the reliability of measurement with graduated scales becausetoo coarse a scale is chosen, this requires interpolation, an act inducing bias
why are steel rules not recommended for control of high production?they are not sufficiently reliable
What is the effect of insufficient reliability of measurements?excessive cost
Which of the following describes parallax error?it is the apparent shifting of an object when the position of the observer is changed
Which of the following methods is the best way to eliminate parallax error?align the rule so that the scale being read is along the line of measurement
When selecting a steel rule for a given measurement, which of the following combinations is preferable?engine engraved scale, shortest length that contains the measurement yet can readily be handled, a scale that discriminates to the same precision that is required in the measurment
this is the preliminary operation that facilitates final machininglayout
why are various attachments used for steel rule?convenience
this tool has a narrow blade that can enter most openings and its head provides a right angle reference to the part - used for measurements of slots, holesdepth gauge
this facilitates a number of different measurement techniques and exemplifies the basic principles of dimensional metrologycombination square set
this provides greater range ans is often convenient - has a greater potential for errorthe combination square
this is the chief limitation in the use of the center headit is limited to round bars
what is the chief reason for studying calipers?they demonstrate the principle of transfer measurement
califpers transfer measurement from a workpiece to a scale --this adds what errorserror from the feel of engagement of the caliper on the workpiece --the other is the fact that every added step adds a new potential for error
some calipers have locks that they may be locked to a fixed opening --what is the use for this?provides a memory of the last measurment
why was a discussion about snap gages included?because we need to distinguish between gaging and measurment
why are calipers important for both layout and machining?both require transfer measurements
which of the following is the most important relationship between dividers and calipers?dividers are calipers intended to be used with line references
why are measurements with an inside caliper considered to be more reliable than those taken with an outside caliper?because the concave surfaces help center the evolution
when using calipers, which of the several variables must be most carefully controlled?feel between legs and the workpiece
select the group of terms in which all items are compatible?beam trammel, surface gage, hermaphrodite caliper, common scriber
which of the following is commonly used with the surface gage?surface plate
which of the following is not a desirable features on the slide caliper?it provides positive contact between the instrument and reference, can adjust instrument for wear, it substitutes a line for a part of a feature to use as a measured point, quick and easy

Chapter 7

Question Answer
Holding the adjusting nut and turning the rachet screw, and running the thimble across the hand and arm are the correct ways to?open and close micrometers
a standard inch micrometer has how many pitch threads per inch40
the chief advantage of the micrometer over the vernier caliper isgreater precision
it requires several micrometers to span the range of what?one vernier caliper
this provides more reliable discrimination than the reading of a vernier scalethe screw of the micrometer
this is a limitation of micrometerstemperature control of the frame
why is a micrometer more directly when measuring 2 micrometers?it can read directly this value
vernier scale of vernier instrument =thimble scale of micrometer
what is the max accuracy of a micrometer?2 micrometers for a metric and 0.0001 inch for an inch
Which of the following is the most appropriate statement about the use of a vernier on a micrometer 0.1?it increases the reliability of 1 mil (0.001 in.) measurements
which is the best way to improve micrometer reliability?close thimble with ratchet stop
what is the function of the clamp ring?to lock a micrometer so that a reading may be remembered
as diameters and lengths increase, which of the following considerations becomes most important?particular care for best positional relationship
which of the following combo of activities is adequate for micrometer care?keep clean, lubricate, and do not leave in tightened position, do not overtighten, do not use compressed air to clean, do not soak in solvent solution
how do small hole gages differ from telescope gages?telescope gages are used for larger dimensions than small hole gages
what alternative methords are there to the depth micrometer for the measurement of recesses to 1 mil (0.001 in.)?vernier depth gage
what is the most important precaution to take when reading the depth micrometer?reversed scales
for reliable measurment with a depth micrometer, certain considerations must be carefully observed---which doesn't apply?clamping of base to workpieice

Chapter 9

Question Answer
these are the two general types of measurementdirect measurement and comparison measurement
this is the most important consideration in which comparison measurement differs from direct measurementthe standard is part of a direct measurement instrument, but a comparison instrument does not have a standard
All measurement, including time and mass as well as length, requires certain common factors such asthe standard, the unknown measurement, and the measurement system
resolution =visual separation between divisions
how is precision increased in most measurement instruments?amplification
which of the following occur with an increase in amplification?the scope and range decrease as the cost increases
why do dial comparators use gear trains instead of levers to achieve amplification?lever actions are difficult to keep clean
the use of a digital readout on an instrument shows which of the following?taken by itself it tells nothing
in popular usage comparator refers to?electronic and mechanical instruments for the precision comparison of lengths
which of the following occurs when amplification is increased?sensitivity is increased
this group of characteristics is essential for one important capability --the characteristics are resolution, size of the graduations, dial contrasts, and parallax--which is the capability they determine?precision
what determines the number of graduatios that can be put on an indicator dial?diameter of the dial and precision of the instrument
how are precision and accuracy related to dial indicatorsprecision is essential for fulfillment of accuracy
what are the usual discriminations in which satndard dial indicators are available (inches)?0.001, 00005, 0.0025, 0.0001
what error is eliminated or minimized by zero setting adjustment?bias and computational error
which of the following best describes the difference or similarity between balanced and continuous indicator dials?continuous dials and balanced dials are analogous to unilateral and bilateral tolerances
why should the shortest range of indicator that will contain the tolerance be selected?the shorter the range, the higher than precision
how are the many surface situations accomodated by dial indiactors?interchangable contact points
how many different movesments are possible with a loose-jointed indicator stand?6

Chapter 11

Question Answer
which of the following best describes pneumatic metrology?the use of change of airflow to show change in length
what other terms are used for pneumatic metrology?air gaging
what is the chief feature for most application of pneumatic metrology that is unique to this method?there is no metal to metal contact
which of the following describes gaging as a special form of measurment?measurment to determine whether a part feature is between its high and low tolerance limits
why is pneumatic comparator considered to be an analog measuring instrument?because the change in flow is proportional to the change in feature size
which of the following is the most important limitation of pneumatic metrology?surface finish of workpieces
pneumatic gaging utilizes special terminology ---which refers to calibration of a gaging set up?mastering
come up refers to which of the following?the travel of the float before it reaches the tolerance
which of the following best describes the precision for practical measurement with pneumatic comparators?tenth mils (0.0001in.) is considered average