Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-II EXAMINATION SUMMER 2017
Subject Code: X21903 Date:03/06/2017
Subject Name: MECHANICAL MEASUREMENT METROLOGY
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt any five questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Answer the following: (Any seven)
1. List the different types of errors in measurement systems.
2. Define the terms: Accuracy and Precision.
3. Define following terms related to screw thread measurement: Lead Pitch
4. Define: Resolution Threshold.
5. Explain briefly: International temperature scale (ITS).
6. State the different uses of telescopic gauge.
7. How can you increase the upper range of mercury in glass thermometer? State the advantage and disadvantage of using mercury as liquid in glass thermometer.
8. Explain the slip gauges briefly.
9. Draw a neat sketch of thermo couple and list three types of thermocouples with its range and accuracy of measurement.
10. List the different errors of Bourdon tube pressure gauge.
14
Q.2

Explain liquid in glass thermometers in detail with neat sketch.
07

Explain the need of calibration of an instrument? How it can be carried out? The following sets of observation are taken while calibrating Bourdon tube pressure gauge with dead weight pressure gauge:
Actual pressure
(kgf/cm2)
5
10
15
20
25
30
25
20
15
10
5
Gauge reading(kgf/cm2)
4.5
9.6
14.2
18
22.5
28
26
19.5
16.2
11.4
7.0
Draw the different calibration curves (graphs) and give your comments on it.
07
Q.3

Explain the working principle and construction of bimetallic thermometer with neat sketch.
07

Explain the construction and working of McLeod gauge with neat sketch.
07
Q4

List the different Linear measuring instruments. Explain vernier height gauge in detail.
07

Explain the need for surface roughness measurement. Explain the different parameters used in surface roughness measurement.
07
Q.5

Explain the two wire system and three wire system of measurements used in Screw thread measurement.
07

Explain the following (Any
1. seismic pick ups
2. Hot-wire anemometer
3. elastic force transducers
07
Q.6

Explain the gear tooth vernier with neat sketch (construction, working and applications-uses).
07

List the different angular measuring instruments. Explain the construction and working and limitations of sinebar with neat sketch.
07
Q.7

Discuss the need of alignment tests of different machine tools? Explain the alignment tests for lathe drilling machine tool with neat sketch.
07

Explain the Tool-makers microscope with neat sketch (construction, working and applications-uses).
07