Exam Details
| Subject | Metrology and Instrumentation | |
| Paper | ||
| Exam / Course | Bachelor of Technology in Mechanical Engineering (Computer Integrated Manufacturing) BTME | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 4
IBME-ol41
B.Tech. MECHANICAL ENGINEERING (COMPUTER INTEGRATED MANUFACTURING)
00572
Term-End Examination
December, 2016
BME-014: METROLOGY AND INSTRUMENTATION
Time hours Maximum Marks: 70
Note: Answer any Beven questions. All questions carry equal . marks. UBe of scientific calculator is permitted.
1. Why are tolerances provided on dimensions of the components
Explain each type of fit with suitable examples. 5+5
2. Explain the following terms in mechanical measurements
Calibration
Sensitivity
Precision
Accuracy
Errors
The diameter of a steel ball is measured five times with a micrometer, giving the following results
8.011 mm, 8.005 mm, 8.009 mm, 8.014 mm, 8.011mm
Calculate the mean diameter and standard deviation. 5+5
3. The divisions on the main scale of a vernier caliper are 0.5 mm apart. The vernier has 100 divisions equal in length to 98 main scale divisions. To what accuracy can the instrument read?
What are the SI units of the following quantities?
Resistance
Inductance
Capacitance
Current
Luminous Intensity
4. Explain the purpose of comparator as used in engineering measurement. What are the advantages offered by the use of comparators when making precision linear checks? Explain with examples.
A 200 mm sine bar is to be set to an angle of 32°5'6". Find the length of the gauge blocks required using any appropriate set of guage blocks
5. Explain why it is not preferred to use a sine bar for generating angles larger than if high accuracy in angle generation is required.
In a hole and shaft combination of 25 mm the nominal size H7 hole limits are
0.021 mm
0.000 mm
and shaft limits are -0.040 mm •
-0.073 mm
state the values of
maximum and minimum clearance obtainable,
allowance, and
tolerance on the hole and the shaft.
6. Distinguish between a measuring instrument and a gauge.
Explain the terms 'primary texture' and 'secondary texture'.
7. Name any two mechanical comparators and mention why there are no wear-related errors in these instruments.
What are the main disadvantages of optical comparators? Discuss in detail. 5+5
8. Explain in brief the working principle of an optical micrometer along with two industrial applications.
The total tolerance on a 60 mm hole is 150 microns. Determine the maximum and minimum size of this hole with the help of neat sketches. 7+3
9. Define the terms allowance and clearance with suitable examples.
What points will you keep in mind in selecting the tolerance between the piston and cylinder of a steam engine Support your answer with reason and diagram. 5+5
10. What are the slip gauges How are they used with sine bar Discuss in detail.
Discuss any two types of limit gauges with the applications. 5+5
IBME-ol41
B.Tech. MECHANICAL ENGINEERING (COMPUTER INTEGRATED MANUFACTURING)
00572
Term-End Examination
December, 2016
BME-014: METROLOGY AND INSTRUMENTATION
Time hours Maximum Marks: 70
Note: Answer any Beven questions. All questions carry equal . marks. UBe of scientific calculator is permitted.
1. Why are tolerances provided on dimensions of the components
Explain each type of fit with suitable examples. 5+5
2. Explain the following terms in mechanical measurements
Calibration
Sensitivity
Precision
Accuracy
Errors
The diameter of a steel ball is measured five times with a micrometer, giving the following results
8.011 mm, 8.005 mm, 8.009 mm, 8.014 mm, 8.011mm
Calculate the mean diameter and standard deviation. 5+5
3. The divisions on the main scale of a vernier caliper are 0.5 mm apart. The vernier has 100 divisions equal in length to 98 main scale divisions. To what accuracy can the instrument read?
What are the SI units of the following quantities?
Resistance
Inductance
Capacitance
Current
Luminous Intensity
4. Explain the purpose of comparator as used in engineering measurement. What are the advantages offered by the use of comparators when making precision linear checks? Explain with examples.
A 200 mm sine bar is to be set to an angle of 32°5'6". Find the length of the gauge blocks required using any appropriate set of guage blocks
5. Explain why it is not preferred to use a sine bar for generating angles larger than if high accuracy in angle generation is required.
In a hole and shaft combination of 25 mm the nominal size H7 hole limits are
0.021 mm
0.000 mm
and shaft limits are -0.040 mm •
-0.073 mm
state the values of
maximum and minimum clearance obtainable,
allowance, and
tolerance on the hole and the shaft.
6. Distinguish between a measuring instrument and a gauge.
Explain the terms 'primary texture' and 'secondary texture'.
7. Name any two mechanical comparators and mention why there are no wear-related errors in these instruments.
What are the main disadvantages of optical comparators? Discuss in detail. 5+5
8. Explain in brief the working principle of an optical micrometer along with two industrial applications.
The total tolerance on a 60 mm hole is 150 microns. Determine the maximum and minimum size of this hole with the help of neat sketches. 7+3
9. Define the terms allowance and clearance with suitable examples.
What points will you keep in mind in selecting the tolerance between the piston and cylinder of a steam engine Support your answer with reason and diagram. 5+5
10. What are the slip gauges How are they used with sine bar Discuss in detail.
Discuss any two types of limit gauges with the applications. 5+5
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