0
1.1kviews
Mechanical Measurement And Control Question Paper - Dec 18 - Mechanical Engineering (Semester 5) - Mumbai University (MU)
1 Answer
0
5views

Mechanical Measurement And Control - Dec 18

Mechanical Engineering (Semester 5)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. Temperature measurement devices, Enlist contact and non-contact types that are widely used in Industry and social life. Give their merits and demerits based on technology and handling of gazettes w.r.t. applications.
(5 marks) 00

1.b. Differentiate between open and closed loop system with example.
(5 marks) 00

1.c. What is the resolution in degrees of an encoder with 6 tracks? The number of increments per revolution is 26.
(5 marks) 00

1.d. Comment on the stability for a given CE of a system

$S^{6}+2+3 s^{5}+6 s^{3}+4 s^{4}+5 s^{2}+3 s=0$

(5 marks) 00

2.a. Obtain the Transfer function for the Block diagram using Standard Block reduction rules

enter image description here

(7 marks) 00

2.b. A strain gauge has gauge factor of 4. If the strain gauge is attached to a metal bar that stretches from 0.25m to 0.255m when strained, what is the percentage change in resistance? If the unstrained value of gauge is $120 ohm$, what is the resistance valve of gauge after application of strain?
(5 marks) 00

2.c. Illustrate the working principle of displacement measurement using "L.V.D.T."
(8 marks) 3729

3.a. Enumerate the types of pressure measurement devices w.r.t. levels i.e. low, medium and high pressures to be measured. State the working principal for each pressure level with example.
10 marks) 00

3.b. What are the different temperature compensation techniques used in the measurement of strain gauges? Explain any two methods's in details.
(10 marks) 00

4.a. Illustrate a mathematical model for a thermal system given in the fig:1 and represent its transfer function. The bath temperature is θi and temperature indicated by thermometer is θo

enter image description here

(10 marks) 00

4.b. A system is given by differential equation ,

$\frac{d^{2} y}{d t^{2}}+4 \frac{d y}{d t}+8 y=8 x$

where y = output and x = input. Determine all time domain specifications for unit step input and plot the response curve.

(10 marks) 00

5.a. Addition of Zeros in the numerator of a given system G(s) H(s) improves the stability of the system, then If (S + 4) is a zero added to a given system $\mathrm{G}(\mathrm{s}) \mathrm{H}(\mathrm{s})=\mathrm{K} / \mathrm{s}\left(\mathrm{s}^{2}+2 \mathrm{s}+2\right)$

(K, in numerator is a constant), Sketch the root locus and comment on its stability.

(10 marks) 00

5.b. A servomechanism is designed to keep a radar antenna pointed at a flying aeroplane. If the aeroplane is flying with a velocity of 600 km/hr, at a range of 2 km and the maximum tracking error is to be within 0.10.Determine the required velocity error coefficient.
(10 marks) 00

6.a. What do you understand by a State -space modeling of a system? Define state space and state variables.
(5 marks) 00

6.b. Write a short note on PID controller.
(5 marks) 00

6.c. A feedback system has $\mathrm{G}(\mathrm{s})=100(\mathrm{s}+4) / \mathrm{s}(\mathrm{s}+0.5)(\mathrm{s}+10) .$ Determine $\mathrm{GM}, \mathrm{PM}, \omega_{\mathrm{gc}}$ and $\omega_{\mathrm{pc}} .$ Draw Bode plot and comment on its stability.
(10 marks) 00

Please log in to add an answer.