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Code No: R05312003
Set No. 1
III B.Tech I Semester Regular Examinations, November 2007
METROLOGY AND QUALITY CONTROL
(Production Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. (a) Explain the need of ‘standards of measurements’ in the modern industrial
systems.
(b) Classify and give brief outlines of di erent types of standards used for mea-
surement. [8+8]

2. What are the essential considerations in selection of materials for gauges and what
are the common materials used for gauges? Explain the various processes of man-
ufacturing gauges? [16]

3. Describe the metho d to nd out the atness of a surface plate? State the precau-
tions to be taken while using a surface plate. [16]

4. (a) Describe the essential characteristics of comparator.
(b) How comparators are classi ed? Brie y discuss each. [8+8]

5. Name the various alignment tests to be performed on a lathe. Describe any two of
them in details. [16]

6. (a) Describe the construction and working of a three-axis measuring machine.
(b) Describe be in brief the “Laser Telemetric system”. [8+8]

7. Discuss the term ‘Control’ in Quality Control. De ne Quality and Quality Control.
What are the functions of Quality Control Department? [16]

8. De ne the terms AQL, AOQL, LTPD and Sample Error. [16]


Code No: R05312003
Set No. 2

1. Describe with a neat sketch of the following with an example.

(a) Di erential screw micrometer
(b) Depth micrometer.
[8+8]

2. Explain the principle of measurement by light wave interference method and what
are the necessary conditions for interference of light waves? [16]

3. (a) Discuss the relative merits and demerits of the mean line and envelope system
of measurement of surface nish?
(b) In the instrument of surface roughness, heights of 20 successive peaks and
troughs were measured from a datum and were 15, 15, 20, 42, 15, 18, 62, 35,
25, 12, 16, 18, 12, 12, 2, 21, 17, 18, 35, 20 microns. If there measurements were
obtained over a length of 20 mm. Determine C.L.A (Ra) and R.M.S value of
the rough surface. [6+10]

4. With the help of a neat sketch, explain construction, principle and working of Reed
type Mechanical comparator? [16]

5. (a) Distinguish between geometrical and practical tests.
(b) Name and brie y explain the various instruments required for performing the
alignment tests on machine to ols. [6+10]

6. Explain with the help of sketches the working principles of the instruments used in
checking of pro le and base pitch of the gear. [16]

7. The data on a single quality characteristic of a component of a milling machine is
tabulated below. Find the control limits. [16]
Date Number inspected Number of defectives
1 369 14
2 347 27
3 405 44
4 304 70
5 162 12
6 91 9
7 164 1
8 157 22
9 196 3


Code No: R05312003
Set No. 2
8. (a) State and explain the advantages and limitations of acceptance sampling over
100% inspection?
(b) A single sampling plan has n = 110 and c = 3. The lot size is large as compared
to sample size. Plot the O.C. curve and nd the value of lot tolerance percent
defective for which the probabilities of acceptance are 0.95, 0.50 and 0.10
respectively. If AQL = 1% and LTPD = 4%, determine the producer’s risk
and consumer’s risk. Here n = sample size and c=acceptance number. [6+10]


Code No: R05312003
Set No. 3

1. (a) With the help of sketches explain the constructional details and working of a
dial gauge. Clearly indicate in your answer, how the magni cation is achieved?
(b) Enumerate various types of outside micrometers and their uses. [8+8]

2. Explain with neat sketches, the construction and uses of

(a) Vernier bevel protractor
(b) Optical bevel protractor. [16]

3. (a) Describe the classi cation of surface roughness parameters involved in evalu-
ation of surface nish?
(b) What are the factors a ecting surface roughness? What is the necessity for
controlling the surface texture? [8+8]

4. (a) List the di erent elements required to be measured in order to determine the
accuracy of screw threads.
(b) What is Drunken thread? What di culties does it present in nalising the
pitch of the thread? [8+8]

5. Describe how you would perform the following tests on a lathe

(a) Leveling of the machine
(b) True running taper socket in main spindle

(c) Parallelism of main spindle to saddle movement. [4+6+6]

6. Explain the following methods of inspecting gear.

(a) Run out
(b) Alignment.
[8+8]

7. (a) Discuss the functions and method of quality control in the case of a product
manufacturing industry such as soap manufacturer.
(b) Gears are inspected for error in tooth pro le and other defects in samples
of 100 each. Presence of any error renders the gears as defective. The data
below should be used for constructing control chart. Use percent defective for
chart to remark whether the process is under control or not. The number of
defectives in the twenty samples numbered 1 to 20 is given below: 1, 2, 1, 0,
1, 1, 0 1, 1, 3, 2 0, 2, 2, 1, 1, 8, 3, 0 and 0.


Code No: R05312003
Set No. 3
8. (a) What is CENSUS? Give its signi cance.
(b) What are the situations warranting the application of complete enumeration
but not sampling? Explain with examples. [8+8]


Code No: R05312003
Set No. 4

1. (a) Explain the e ect of engineering allowance on the di erent types of t required
in Engineering manufacture.
(b) Discuss the e ect of temperature on the application of limits. [8+8]

2. A 120 mm sine bar is used to set an angle of 32.50. Determine the list of slip gauges
needed? Estimate the error in the angle if

(a) Distance between rollers is not correct by 0.01 mm
(b) If diameter of rollers is out by 0.005 mm.
[16]

3. The heights of peaks and valleys of 20 successive points on a surface are 20, 10, 48,
36, 28, 42, 30, 12, 11, 23, 63, 52, 40, 40, 70, 70, 11, 39, 32, 32 microns respectively,
measured over a length 20 mm. Determine the CLA and RMS values of roughness
surface. [16]

4. Draw an illustrative the line diagram of a pitch measuring machine and describe
its working? [16]

5. Describe the following alignment tests on a slotting machine.

(a) Square ness of ram slide with table.
(b) Square ness of the saddle with the ram. [8+8]

6. Explain any two methods measuring Gear Pitch? [16]

7. Explain the procedure to construct C - Chart with an example. What are its
applications, merits and demerits? [16]

8. (a) What are the pre-requisites for conducting a sampling?
(b) Write short notes on:
i. Type - I Error
ii. Type - II Error. [8+4+4]

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