2005 Punjab Technical University B.Tech Mechanical Engineering METROLOGY MEASUREMENT AND CONTROL ME 307 Question paper
Course: B.Tech Mechanical Engineering University: Punjab Technical University



METROLOGY MEASUREMENT AND CONTROL ME 307 5th Sem May 2k5

Max marks 60

Note: Section A is compulsory. Attempt any Four questions from Section B and any Two questions from Section C.

Section A Marks 2 each
1.
(a) What do you understand by exposed and ungrounded thermocouple junctions?
(b) Draw and label strain gauge bridge circuit.
(c) For a second order system, express and explain the peak overshoot due to step input.
(d) What is the significance of Nyquist plot for the stability and controls f a system?
(e) Draw a block diagram of dead weight pressure gauge tester.
(f) Differentiate between hydraulic and pneumatic load cells.
(g) Explain the working of electromagnetic flux meter.
(h) What do you understand by report writing?
(i) What are the uses and demerits of vernier height gauge?

Section B Marks 5 each

2. Explain construction and working of Bourdon tube.

3. Explain the response of Second order system to a step input.

4. Explain the precautions to be followed for contact and non-contact type temperature measurement.

5. How will you measure straightness and flatness through interferometer?

6. Describe linearity and calibration.

Section C Marks 10 each

7. Explain the theory and construction of Bimetallic Thermometers. What are the commonly used metals. What are their advantages, disadvantages, range and applications?

8. Discuss the construction and working of Pneumatic comparator. Derive the expression for measuring head sensitivity and pneumatic head sensitivity.

9.For the system shown in figure below (please see the attachment):

(i) Derive an expression for the closed loop transfer function and also for characteristic equation.

(ii) Calculate the damping ratio of the system form its characteristic equation.

(iii) If the transfer function of the feedback element is one, what would be the corresponding damping ratio?