Name of the College : SREE CHAITANYA COLLEGE OF ENGINEERING
University : JNTUH
Department : Mechanical Engineering
Subject Code/Name : 07A70304/INSTRUMENTATION AND CONTROL SYSTEMS
Year/Sem : IV/I
Website : scce.ac.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/scce.ac.in/4914-07A70304-INSTRUMENTATIONANDCONTROLSYSTEMS.pdf
SCCE Instrumentation Question Paper :
Code No: 07A70304
R07 Set No. 2
IV B.Tech I Semester Examinations,December 2011
Related : Sree Chaitanya College Of Engineering 07A70311 Mechatronics B.Tech Question Paper : www.pdfquestion.in/4910.html
Common to Mechanical Engineering, Automobile Engineering
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions :
All Questions carry equal marks :
1. (a) How absolute humidity is measured?
(b) What are load cells? Name the application of load cells. [10+6]
2. (a) What is the basic principle in thermal conductivity gauge? Explain the working principle of thermal couple type conductivity gauge.
(b) A McLeod gauge having V = 200cm3 and a capillary diameter of 2 mm is used to measure the gas pressure. What will be the pressure of gas corresponding to a capillary reading of 4cm? [10+6]
3. Describe in detail with neat sketches.
(a) Float operated Rheostat
(b) Hook Level indicator
(c) Turbine flow meter. [4+6+6]
4. (a) Distinguish between RTD and thermisters.
(b) State the laws of thermocouples. How are the laws useful in construction of thermocouple thermometers? [6+10]
5. (a) What are the requirements of control systems.
(b) The operation of driver driving an automobile on the road and identify the components, input and output of the human system. [4+12]
6. (a) What is the temperature compensation with respect to strain gauges?
(b) Explain how an unbonded strain gauge is used to measure strain?
(c) List the essential characteristics required for the backing material of a bonded strain gauge. [6+6+4]
7. Explain the dynamic response characteristics of rst order instruments to step ramp and sinusoidal inputs. [16]
8. Describe the functioning of a stroboscope and describe and explain how speed of a rotating shaft can be measured using a single pattern and multi pattern disc. [16]
Code No: 07A70304
R07 Set No. 4
1. (a) By means of neat sketches, explain the working of a RTD thermometer. Why protection is needed for the sensing element?
(b) Explain by means of neat sketches, the working of thermocouples. What is ambient temperature compensation? [8+8]
2. (a) If a strain gauge has a low gauge factor, what does it indicate.
(b) Name the various types of strain gauges for dierent applications.
(c) Distinguish between bonded and unbonded type of resistance strain gauges. [3+3+10]
3. (a) Distinguish between direct and indirect methods of measurement with suitable examples.
(b) What are desired, modifying and interfering inputs for an instrumentation system? How do you correct the eects of modifying and interfering inputs by the method of signal ltering? Explain by means of suitable examples.[6+10]
4. (a) How does a mechanical load cell work ? Explain the principle of measuring shaft torque using strain gauge torsion meter.
(b) How is dew point temperature measured? [8+8]
5. (a) Explain the working of elementary accelerometers like
i. Vibrating wedge
ii. Cantilever.
Describe how vibrations are measured by each
(b) Explain the construction, principle of working and advantages of Capacitance vibration sensor accelerometers. [10+6]
6. Explain in detail with neat sketches.
(a) Liquid level measurement using Capacitive transducer
(b) Sight glass level indicator
(c) Bubbler level indicator. [6+4+6]
7. (a) What are the basic elements of a control system? Explain
(b) Describe a control system to ll a tank with water after it is emptied through an output at the bottom. This system automatically stops the in ow of water when the tank is filled. Draw the block diagram of the system. [8+8]
8. (a) Describe the construction of a U tube Manometer and explain how it can be used for measurement of absolute gauge and deferential pressures. Describe the different sources of errors and how corrections can be applied to minimize these errors.
(b) A U tube has its right limb open to atmosphere. The left limb is full of water and it connected to a pipe containing water under pressure. The center of which is in level with the free surface of mercury. Find the pressure of the water in the pipe above atmosphere if the difference in levels of mercury in the limbs is 5.08cm.