Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-II EXAMINATION WINTER 2018
Subject Code:X21903 Date: 09/01/2019
Subject Name: Mechanical Measurement Metrology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q:1

State the principle of Linear measuring Instrument and explain briefly construction and use of Height vernier calliper with neat sketch
07

Describe with sketch Sinebar (ii Telescopic gauge
07
Q:2

Define Measurement Metrology. Explain the role of different Standards.
07

Explain Construction Working of Vernior bevel protector.
07
OR

Describe with sketch the construction and use of a Combination Set stating
Limitation.
07
Q:3

Explain Parkinson gear tester with neat sketch.
07

Explain Surface texture and element of Surface roughness.
07
OR
Q:3

Describe Two wire methods to measure the effective diameter of a given screw thread.
07

Define a following terms Accuracy ,Precision, Sensitivity, Threshold,
07
Q:4

What are primary, secondary and tertiary measurements? Explain with example
07

Explain the following elements of screw thread with neat sketch.
Pitch diameter Crest Root Lead Thread angle Helix angle Lead angle.
07
OR
Q:4

Explain Radiation Pyrometer.
07

Describe principle, construction and working of Mcleod gauge.
07
Q:5

Explain construction and working of following
Eddy current dynamometer centrifugal tachometer
07

Explain the constructions working of LVDT stating applications.
07
OR
Q:5

Explain working principle, construction of autocollimator with neat sketch.
07

Write short notes on Tool maker's microscope.
07
of