VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS)
B. Tech VI Semester Regular/Supplementary Examinations, May 2018
(Regulations: VCE-R15)
METROLOGY AND SURFACE ENGINEERING
(Mechanical Engineering)
Date: 10 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Determine the tolerances on the hole and the shaft for a precision running fit designated by 50 H7g6, given:
50 mm lies between 30-50 mm
i (in microns)=0.45(D)1/3+0.001D
Fundamental deviation for hole=0
Fundamental deviation for g shaft =-2.5D 0.34
IT7=16i and IT6=10i
State the actual maximum and minimum sizes of the hole and shaft and maximum and minimum clearances.
15M
2.

Explain Interchangeability and selective assembly.
7M

What is hole basis systems and shaft base system? Explain the significance of hole basis system.
8M
Unit II
3.

State the characteristics of line standard and end standard.
7M

Explain:
i. Gauge Tolerance for workshop gauges, general gauges and inspection gauges with figure
ii. Wear Tolerance
8M
4.

How do you measure taper angle of a job using sine bar? Explain with a neat diagram.
10M

State the advantages and disadvantages of sine bar.
5M
Unit III
5.

Explain with the neat sketch tool makers microscope.
10M

Explain the applications of auto collimator.
5M
6.

How do you measure the effective diameter of screw thread using two-wire method? Explain.
10M

Explain the measurement of major diameter of a screw thread.
5M
Unit IV
7.

Write the neat sketch and explain the working principle of Tally surf roughness tester.
10M
State the advantages of Pneumatic Comparators.
5M
8.

With a neat sketch, explain the elements of surface texture.
10M

Explain the alignment test on lathe.
5M
Unit V
9.

Explain moving bridge type computer controlled CMM machine.
8M

Explain with the neat sketch mechanical cleaning process.
7M
10.

Explain Laser surface heat treatment process.
7M

Explain in detail diffusion coatings with neat sketch.
8M