Tuesday, 20 December 2016

IPU BTech Semester 5: Mechanical and Automation - Metrology (End Term Question Paper 2016)

END TERM EXAMINATION
BTech (Mechanical and Automation)
Semester V
December 2016
Metrology
(ETAT-307)

Time: 3 Hrs           M.M. 75

Note: Attempt all questions as directed. Internal choice is indicated. Draw neat free hand pencil sketch wherever necessary.

Q1: 2.5 x 10 = 25
(a) Differentiate between 'Controllable' and 'Random' errors in brief?
(b) What is ISO system of limits and fits?
(c) List down the different types of comparators?
(d) Write short note on "angle guage" ?
(e) Explain the significance of "Metrology" in engineering?
(f) Explain 'Line Standards' in brief.
(g) Define 'Surface roughness'
(i) List the elements to be measured for inspecting a screw
(j) Define the term 'tolerance'.

Q2:
(a) What do you mean by calibration? (4)

(b) Differentiate between 'precision' and 'accuracy'. Explain the working principle of slip gauges. (8.5)

OR

Q3:
(a) Explain principle of back pressure gauge? (4)

(b) Explain the construction and working of NPL Gauge length interferometer in detail? (8.5)

Q4:
(a) Explain the working principle of NPL Flatness Interferometer. (6)

(b) Explain the principle of Taylor hobson talyurf. (6.5)

OR

Q5:
(a) Explain quality function shewharts control charts for variables?   (6)
(b) Explain the construction and working of gear tooth vernier caliper?  (6.5)

Q6:
(a) Briefly explain the different standard methods used for measurements of surface texture.  (6.5)
(b) Briefly explain two wire method. (6)

OR

Q7:
(a) What do you understand by 'Gauge'? List down different type of gauges used in Metrology?

(b) In a hole and shaft assembly of 40 mm nominal size the tolerance for hole and shaft are as specified below (9.5)
Hole : 40, +0.02, -0.00 mm
Shaft: 40, 0.040, -0.07 mm
Determine:
(i) Maximum and minimum clearance
(ii) Allowance
(iii) Type of fit
(iv) Limits of hole and shaft

Q8:
(a) How 'Circularity' is different from 'Roundness'? (6)

(b) Explain the working principle of a CMM? (6.5)

OR

Q9:
(a) Describe any one method for measuring the effective diameter of a screw thread? (6)

(b) What are the different uses of 'Comparator'? (6.5)