Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}

www.studentyogi.com www.studentyogi.com

Code No: R05312001
Set No. 1
III B.Tech I Semester Regular Examinations, November 2007
INSTRUMENTATION AND CONTROL SYSTEMS
(Production Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. (a) Explain the terms with respect to measurement systems:
i. Static sensitivity
ii. Linearity
iii. Hysterisis
(b) Discuss the response to rst order instruments to sinusoidal input. [9+7]

2. (a) Di erentiate between rare metal thermocouples and base metal thermo cou-
ples.
(b) Design a measurement system for displacement measurement using LDR (Light
dependent resistor) as sensor. [6+10]

3. (a) Explain the measurement of pressure using U-tube manometer.
(b) Discuss the constructional features of Bourdon-tube pressure guage. [8+8]

4. (a) What is Hot Wire Anemometer? Describe its construction and principle of
Working.
(b) With neat diagram, explain the working of turbine ow meter and point out
its limitations. [8+8]

5. (a) What is the working principle of a stroboscope?
(b) Compare the working of a servo and digital accelerometers. [4+12]

6. (a) What is a bonded strain gauge?
(b) List the main advantages and limitations of semiconductor strain gauges.
(c) Explain one method of temperature compensation using an adjacent arm com-
pensating gauge. [2+6+8]

7. (a) Why humidity is to be measured?
(b) De ne the Psychometric terms.
i. Dry air
ii. Moist air
iii. Saturated air
iv. Absolute humidity
v. Relative humidity


Code No: R05312001
Set No. 1
vii. Wet bulb temperature [2+14]

8. (a) Describe with neat sketch the open loop speed control system.
(b) Illustrate with example, explain Closed loop temperature control system. [8+8]


Code No: R05312001
Set No. 2

1. (a) By means of at least two examples explain terms.
i. Desired inputs
ii. modifying inputs
iii. interfering inputs
iv. output
(b) How are the e ects of modifying inputs and interfering inputs eliminated by
method of opposing inputs. Explain by means of an example. [8+8]

2. (a) Explain by means of neat sketches, the use of helical potentiometers for dis-
placement measurement.
(b) Explain by means of neat sketches, the working principle of pressure ther-
mometers. [6+10]

3. (a) How do you measure the pressure with the help of U-tube manometer and
Micro manometer.
(b) Explain the working principle of Pirani thermal conductivity gaguge [8+8]

4. Show that there exists a linear relation ship between the volume ow rate and
displacement of oat in the case of a rotameter .Prove that if the density of the
oat material is made twice that of owing uid, the volume ow rate becomes
independent of the density of the owing uid and compression is almost complete
for all ows. [16]

5. (a) Describe the working principle of D.C.Tachometer generator and what are its
advantages and disadvantages.
(b) What are the advantages and disadvantages of centrifugal speed tachometer?
[12+4]

6. (a) If a strain gauge has a low gauge factor, what do es it indicate.
(b) Name the various types of strain gauges for di erent applications.
(c) Distinguish between bonded and unbonded type of resistance strain gauge.
[3+3+10]

7. (a) Explain brie y how a stroboscopic is used to measure torque.
(b) Explain the method of measuring force using a pneumatic load cell. [8+8]


Code No: R05312001
Set No. 2
8. (a) With suitable examples, bring out the advantages of closed loop system over
open loop system.
(b) Draw a block diagram of the closed loop system considered above. Also explain
why negative feed back is invariably preferred in such systems. [8+8]


Code No: R05312001
Set No. 3

1. (a) By means of at least two examples explain terms.
i. Desired inputs
ii. modifying inputs
iii. interfering inputs
iv. output
(b) How are the e ects of modifying inputs and interfering inputs eliminated by
method of opposing inputs. Explain by means of an example. [8+8]

2. (a) Di erentiate between rare metal thermocouples and base metal thermo cou-
ples.
(b) Design a measurement system for displacement measurement using LDR (Light
dependent resistor) as sensor. [6+10]

3. (a) With the aid of neat sketch, explain the working principle of dead weight type
Tester.
(b) Derive an equation for the di erential pressure based on the movement of the
liquid in the inclined column only. [8+8]

4. What are the di erent direct methods available for the measurement of liquid level.
Explain any two of them. [16]

5. (a) De ne vibration. How is it characterized and list some of its harmful e ects.
(b) Explain the calibration procedure for an accelerometer. [6+10]

6. (a) Explain the method of measuring force using strain gauges.
(b) What are the requirements of a strain gauge.
(c) Mention di erent technique available for the measurement of strain. [8+4+4]

7. (a) With neat sketch explain the working principle of Mechanical humidity sensing
absorption hygrometer.
(b) sketch and explain the constructional details and working of a dew point meter.
[8+8]

8. (a) Sketch and explain position control using servo motor.
(b) Sketch and explain open loop and closed loop temperature control system with
block diagrams.


Code No: R05312001
Set No. 3
(c) Brie y explain about positive feedback and negative feed back. [6+6+4]


Code No: R05312001
Set No. 4

1. (a) Classify measuring instruments.
(b) What are desired, modifying and interfering inputs for a measurement system?
Give examples for each of these quantities. What is the in uence of these on
the nal output? [6+10]

2. (a) Explain various methods used for reference junction compensation in thermo-
couples.
(b) Explain the construction and working of a thermometer to measure tempera-
tures above 7000C. [8+8]

3. (a) Discuss various types of elastic pressure sensing elements used in electrical
Transducers.
(b) Describe the application, advantages and limitations of elastic diaphragm
gauges. [10+6]
4. (a) Explain the principle of operation of a Rotameter. What are its limitations?
(b) Discuss the types of ow meters. [8+8]
5. (a) A centrifugal tachometer having range 25-300, 250-3000, and 2500-30000 rpm
is to used to measure the speed of a shaft which is believed to be in the vicinity
of 3000 rpm. What range setting should be tried and why?
(b) List any three mechanical tachometers used for measuring angular velocity
and brie y explain them with suitable diagrams. [4+12]
6. (a) List a few bonding adhesives used for bonding strain gauges to the test surface.
(b) Name the various types of strain gauges for di erent applications.
(c) An electric resistance strain gauge of 100 resistance and gauge factor 2 is
bonded to a specimen of steel. Calculate the change in resistance of the gauge
when a tensile stress of 60MN/ 2 is applied on the specimen. [4+6+6]

7. (a) Explain with a diagram a pendulum scale of multi lever type.
(b) Explain the method of measuring of force using a pneumatic load cell. [8+8]
8. (a) What is a servo mechanism? Explain
(b) Describe the operation of a driver driving an automobile on the road and
identity the components, input and output of the human system. [8+8]

Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}

Recommended

Recommended

More Related Content

What's hot

What's hot (15)

Similar to Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}

Similar to Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com} (20)

More from guest3f9c6b

More from guest3f9c6b (20)

Recently uploaded

Recently uploaded (20)

Instrumentation and control systems Jntu Model Paper{Www.Studentyogi.Com}