VALLIAMMAI ENGINEERING COLLEGE

SRM Nagar, Kattankulathur – 603 203

DEPARTMENT OF

ELECTRONICS AND INSTRUMENATION ENGINEERING

QUESTION BANK

V SEMESTER

EI6502 - INDUSTRIAL INSTRUMENTATION – I

Regulation – 2013

Academic Year 2017 – 18

Prepared by

Mr. N. Sowrirajan, Assistant Professor (O.G) /EIE

Mr. G. Shiva, Assistant Professor (O.G) /EIE

VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur – 603 203.

DEPARTMENT OFELECTRONICS AND INSTRUMENATION ENGINEERING

QUESTION BANK

SUBJECT : EI6502 - INDUSTRIAL INSTRUMENTATION – I

SEM / YEAR: VI / III

UNIT I - MEASUREMENT OF FORCE, TORQUE AND SPEED

UNIT I -BASIC CONCEPTS Electric balance - Different types of load cells - Hydraulic, Pneumatic, strain gauge-

Magnetoelasticand Piezoelectric load cells - Different methods of torque measurement:- Strain

gauge-Relativeangular twist-Speed measurement:-Capacitive tacho-Drag cup type tacho-D.C and

A.C tachogenerators - Stroboscope.

PART - A

Q.No Questions BT

Level Competence

1. What is the function of Rosette? 1 Remember

2. What are the properties of materials used for Piezo electric

transducers?

1 Remember

3. Define gauge factor for strain gauge. 1 Remember

4. State the mechanism of Piezo – electric effect. 1 Remember

5. What are the merits of stroboscope? 1 Remember

6. Define force and write its units. 1 Remember

7. Give the types of load cell. 2 Understand

8. Summarize the application of stroboscope. 2 Understand

9. Give different types of strain gauge load cell. 2 Understand

10. Give the expression for shaft speed in shaft speed

measurement using stroboscope. 2 Understand

11. Calculate the torque developed by a motor shaft when it is

running at 1500 rpm and delivering shaft power of 5 horse

power.

3 Apply

12. Discuss the principle of DC tacho generator. 3 Apply

13. Show how Elastic materials are used for force measurement. 3 Apply

14. Why are dummy gauges used? In what way they affect the

output of a strain gauge bridge? 4 Analyze

15. Point out the main advantages of a semiconductor strain

gauge.

4 Analyze

16. Identify the factors affecting the accuracy of force

measurement. 4 Analyze

17. Justify the effect of Temperature in strain gauge bridge

circuitry? How is to be compensated? 5

Evaluate

18. Summarize the applications of load cell. 5 Evaluate

19. Create a bridge circuits for measuring instrument and justify it

need.

6 Create

20. Design a suitable signal conditioning circuit for LVDT based

force measurement system of your own. 6 Create

PART – B

1. Describe about the two types of mechanical load cells.

Explain them in detail. (13) 1 Remember

2. Explain the principle and construction of :

(i) Hydraulic load cell. (7)

(ii) Drag cup DC tachogenerator. (6)

4 Create

3. Describe about Magneto Elastic and Piezo Electric Load cell

with a neat diagram. (13) 1 Remember

4. Draw the diagram and describe the working, construction of

(i) Inductive torque transducer. (7)

(ii) Electric balance. (6)

1 Remember

5. Discuss the DC and AC tachogenerator with relevant diagram

abs mention the merits and demerits. (13) 2 Understand

6. Briefly describe the working of different speed measurement

methods. (13)

2 Understand

7. (i)

)

Explain how the speed can be measured using

Revolution counter. (7) 5 Evaluate

(ii)

Explain how proximity sensor can be used for torque

measurement. (6)

8. (i)

(

i

i

)

i

i

)

Illustrate the basic means of force measurement. (7)

3 Apply (ii)

Illustrate with neat sketches, the working of pneumatic

load cell. (6)

9. With neat diagram explain ,the construction and working of

(i) Capacitive torque transducer. (7)

(ii) Stroboscope. (6)

4 Analyze

10. Explain the following methods of measurement of torque:

(i) Digital methods. (7)

(ii) Magneto strictive methods (6)

4 Analyze

11. (i)

Express the construction, working of optical torsion

meter. (7) 2 Understand

(ii)

Describe the functioning of stroboscope. (6)

12. (i)

Derive the expression of output from the Drag cup Rotor

AC tachogenerator. (7) 1 Remember (ii)

What are factors to be considered while designing force

measurement without affecting accuracy? (6)

13. (i) Illustrate the working of strobotron. (7) 3 Apply

(ii)

Mention the advantages and disadvantages of

stroboscope measurement technique? (6)

14. Design a strain gauge torsion meter. Discuss the construction,

working and advantage of the same. (13) 6 Create

PART – C

1. (i) Draw and explain the equivalent circuit for piezoelectric

transducer. (8) 5

Evaluate

(ii)

Draw and explain pulse response of piezoelectric

transducer. (7) 2. (i) A rotating disc has five equispaced radial lines marked

on it. When a stroboscope is directed at the disc a true

pattern is observed at the highest flash frequency equal

to 3000 flashes per seconds. What will be the other flash

frequencies which produce a 5 line pattern and a 10 line

pattern? (8) 5 Evaluate

(ii)

While measuring the speed of a steam turbine with

stroboscope single line images were observed for

stroboscope setting of 3000, 4000 and 5230 rpm.

Evaluate the speed of turbine. (7)

3. Design a Torsion bar dynamometer for torque measurement.

Discuss about the various methods force measurement. (15) 6 Create

4. Design a Bonded strain gauge transducer for measuring

compressive force and explain with bridge circuit. (15) 6 Create

UNIT II - MEASUREMENT OF ACCELERATION, VIBRATION AND DENSITY

Accelerometers :- LVDT, Piezoelectric, Strain gauge and Variable reluctance type accelerometers -

Mechanical type vibration instruments - Seismic instruments as accelerometer - Vibration sensor -

Calibration of vibration pickups - Units of density and specific gravity - Baume scale and API scale -

Pressure type densitometers - Float type densitometers - Ultrasonic densitometer – gas densitometer.

PART – A

Q.No Questions BT

Level Competence

1. State the function of seismic transducer. 1 Remember

2. Write the disadvantages of LVDT. 1 Remember

3. List the merits of ultrasonic densitometer. 1 Remember 4. What is accelerometer? 1 Remember

5. What is LVDT? 1 Remember

6. Define specific weight and density. 1 Remember

7. Give the units of density used in industries. 2 Understand

8. Summarize the different ways to measure density. 2 Understand

9. Specify the applications of bridge type gas densitometer. 2 Understand

10. Outline the demerits of float type densitometer. 2 Understand

11. Examine the quantities required in a vibration measurement

system.

[Apr/May-15]

3 Apply

12. Show the advantages of mechanical type vibration measuring

instruments.

[Nov/Dec-12]

3 Apply

13. An accelerometer has a seismic mass of 0.05kg and a spring

constant of 3000 N/m. Maximum mass displacement is +/- 0.02

m. Calculate the natural frequency. 3

Apply

14. Differentiate relative and absolute Acceleration measurement.

4 Analyze

15. Point out some advantages of LVDT. 4 Analyze

16. Differentiate the two modes of operation of accelerometer. 4 Analyze

17. Compare the terms specific weight and specific gravity. 5 Evaluate

18. Criticize how a seismic instrument acts as accelerometer. 5 Evaluate

19. Formulate the expression for sinusoidal vibration. 6 Create

20. Draw the setup of Gas densitometer. 6 Create

PART – B

1. (i) Give a detailed explanation about working of LVDT type

and Piezo electric type accelerometers used for

measurement of acceleration. (8)

1

Remember

(ii) Write their advantages and disadvantages. (5)

2. Discriminate the seismic instruments as a vibrometer and

accelerometer. Justify with your answer. (13) 1 Remember

3. Discuss about the quantities involved in vibration measurement.

Explain the operation of seismic transducer in different modes of

operation. (13)

1 Remember

4. (i) What is a vibrational pick up? Explain about the nature of

vibration. (8) 1 Remember

(ii) What are the quantities involved in Vibration

Measurements? (5)

5. Investigate how relative motion is measured using seismic

instruments. (13) 6 Create

6. (i) Describe about the basic of Vibration Measurement

System. (8) 2 Understand

(ii) Describe the different methods of Controlling exposure to

vibration. (5)

7. (i) Explain in detail about Variable reluctance accelerometer

with a neat sketch. (8) 4 Analyze

(ii) Explain in detail about strain gauge accelerometer. (5)

8. Draw the schematic diagram of Pressure head type densitometer

and explain its working and construction. (13)

4 Analyze

9. Briefly describe about the construction and working principle of

Ultrasonic densitometer. (13)

2 Understand

10. Explain the working and construction of

displacement-type densitometers. (13) 2 Understand

11. Explain the following with a neat sketch

(i) Float type densitometer (8)

(ii) Ultrasonic densitometer (5)

5 Evaluate

12. Mention in detail about

(i) API scale (7)

(ii) Baume scale (6)

3

Apply

13. Explain the working and construction of Thermal gas

densitometer. (13) 4 Analyze

14. Illustrate in detail about the calibration of vibration pickup. (13) 3 Apply

PART – C

1. Explain about the deflection type accelerometers. Classify the

different types of deflection type accelerometers. (15) 5 Evaluate

2. Design a Vibrometer using Laser Doppler technique. (15) 6 Create

3. Design an ultrasonic slurry densitometer. Discuss about the

attenuation of sonic or ultrasonic pulses increases as the sludge

density rises. (15)

6 Create

4. Deduce a displacer type densitometer with Torque-Tube. (15) 5 Evaluate

UNIT III - PRESSURE MEASUREMENT

Units of pressure - Manometers, different types, Elastic type pressure gauges, Bourdon tube,

bellows and diaphragms - Electrical methods:- Elastic elements with LVDT and strain gauges -

Capacitive type pressure gauge - Piezo resistive pressure sensor-Resonator pressure sensor -

Measurement of vacuum-McLeod gauge-Thermal conductivity gauge-Ionization gauges – Cold

cathode type and hot cathode type - calibration of pressure gauges - Dead weight tester.

PART – A

Q.No Questions BT

Level

Competence

1. List the transducer used for measuring low pressure. 1 Remember

2. Write the limitations of ionization vacuum gauge in low

pressure measurement. 1 Remember

3. What is a dead weight tester? 1 Remember

4. Define static pressure. 1 Remember

5. Mention any three elastic type pressure gauge. 1 Remember

6. Name the pressure gauges used to measure Vacuum

pressure.

1 Remember

7. Summarize the demerits of dead weight tester. 2 Understand

8. Give the advantages of using Well type manometer. 2 Understand

9. Express the different units of pressure. 2 Understand 10. Write down the expression for pressure in friction gauge. 2 Understand

11. Classify the types of Diaphragms. 3 Apply

12. What do you infer from the limitations of Mcleod gauge? 3 Apply

13. Classify the pressure based on the type of measurement. 3 Apply

14. Categorize the different application of dead weight tester.

[Nov/Dec-12] 4 Analyze

15. Compare the materials used for Diaphragm design. 4 Analyze

16. How is differential pressure measured in multiple fluid.

[Nov/Dec-15]

4 Analyze

17. Explain the principle of capacitive transducer for pressure

measurement.

[Nov/Dec-15]

5 Evaluate

18. Expanding fluid Create Pressure. Comment on this statement 5 Evaluate

19. Develop an arrangement used for calibration of pressure

gauge. 6

Create

20. Formulate the expression for pressure in hot cathode type

ionization gauge. 6 Create

PART – B

1. Describe the methods of measurement of pressure using

thermal conductivity gauges. (13) 1 Remember

2. Describe the following term.

(i) Bourdon tubes

(ii) Bellows

(iii)Diaphragms (4+4+5)

1 Remember

3. With neat sketch describe the method of measurement

differential pressure using Capacitive differential pressure

sensor. Mention its advantages and disadvantages. (13) 1 Remember

4. Write the principle and construction of LVDT with a neat

sketch and mention the characteristics, merits and

application. (13)

3 Apply

5. (i) Discuss about the resonator pressure senor. (8)

2 Understand (ii) Discuss the working of hot cathode type ionization

gauge. (5)

6. (i) What are the different types of electrical pressure

transducers commonly used in industries? Discuss.

(8) 1 Remember (ii) Describe with a neat sketch, the construction and

working principles of U tube of manometer used for

pressure measurement. (5)

7. Describe the methods of pressure measurement using

resistive type pressure transducers. (13) 2 Understand

8. Demonstrate how a Dead weight tester is used to calibrate

pressure measuring device. (13) 3 Apply

9. (i) Classify the pressure transducer based on range of

measurement and type of measurement. (8)

4 Analyze (ii) Explain with a neat sketch, the construction and

working principles of well type and inclined type

manometer used for pressure measurement. (5)

10. (i) What is meant by pressure? Write short notes on its

classification based on Reference pressure. (8)

4 Analyze (ii) Outline the working cold cathode type ionization

gauge. (5)

11. Describe the working of all types of bourdon tube pressure

gauges with a neat schematic. (13) 2 Understand

12. Explain how McLeod gauge used for low pressure

measurement. Justify this with your answer. (13) 4 Analyze

13. Recommend a pressure sensor to be employed in house hold

appliances. (13)

5 Evaluate

14. Develop a setup to measure vacuum pressure .Explain the

mechanism behind it. (13) 6 Create

PART – C

1. Design a gauge using bellow to measure gauge pressure and

differentia pressure. (15) 6 Create

2. Write short notes on various types of diaphragm and bourdon

tubes. (15) 6 Create

3. (i) A MCleod gauge has volume of bulb capillary and

tube down to its opening equal to 90 cm3 and a

capillary diameter of 1 mm. Evaluate the pressure

indicated by a reading of 3 cm. (8)

5

Evaluate

(ii) Explain about the manometer dynamics. (7)

4. Obtain the testing and calibration of pressure gauges. (15) 5 Evaluate

UNIT-IV TEMPERATURE MEASUREMENT-I

Definitions and standards - Primary and secondary fixed points - Calibration of thermometers -

Different types of filled in system thermometers - Sources of errors in - filled in systems and their

compensation - Bimetallic thermometers - RTD - characteristics and signal conditioning-3 lead

and 4 lead RTDs - Thermistors.

PART – A

Q.No Questions BT

Level Competence

1. Mention the sources of error in filled in system thermometer.

[Nov/Dec-11&15]

1 Remember

2. For a liquid in glass thermometer used for low temperature up

to -360 degree F, what liquid can be used and state why? 1 Remember

3. What are the methods available for thermometer calibration?

1 Remember

4. List the advantages of RTD sensors over thermistors. 1 Remember

5. Enumerate the differences between RTD and thermistor. 1 Remember

6. What is RTD? 1 Remember

7. Give the merits of thermistor. 2 Understand

8. Express the V-I characteristics of Thermistor with a neat

diagram.

[May/Jun-13]

2 Understand

9. Estimate the temperature range measurement of bimetallic

thermometer.

[Apr-May/10]

2 Understand

10. Classify the different temperature measurement types using

change in physical properties. 2 Understand

11. Draw the response curve for different bimetallic elements. 3 Apply

12. Draw the different compensation types in filled –in system

thermometers. 3 Apply

13. Sketch the response curves for resistance thermometers in air

and water. 3 Apply

14. Infer the general classes of filled system thermometers. 4 Analyze

15. A bimetal element formed with stainless steel and invar at

1000C is raised to 200

0C. Each strip has a thickness of

0.0107cm. Calculate ρ. 4 Analyze

16. For a liquid filled-in system the compensation is effected at

the middle of the scale by a bimetallic compensator for

ambient temperature variation. If the differential expansivity

of the fluid and the spring material is 9x10-4

/0C, calculate the

ambient temperature error at the end scales.

4 Analyze

17. Predict for what application the mister is preferred as

temperature sensor. 5 Evaluate

18. Frame the pressure temperature relationship for filled in

system thermometer under constant volume condition. 5 Evaluate

19. Schematically explain the filled in thermometric system. 6 Create

20. Write the features of liquid in glass thermometer. 6 Create

PART – B

1. (i) What is calibration? Prepare a notes on how thermometer

should be Calibrated. (8)

6 Create (ii) Prepare short notes on Definitions and Standards of

temperature scale. (5) 2. (i) Describe the different types of thermistor with sketch. (8)

2 Understand (ii) Give the merits and demerits of thermistor. (5)

3. (i) Demonstrate the applications of bimetallic thermometer

in detail. (8) 3 Apply

(ii) Mention the merits and demerits of bimetallic

thermometer. (5)

4. What are the possible source of errors in filled-in

thermometers and how are they minimized / compensated for?

In a filled-in system that uses pressure spring as the pointer

actuator, the bulb, capillary and pressure spring volumes are

in ratio

Vb:Vc:Vp :: 10:1:2

and the temperature changes in them are in the ratio

tb:tc:tp :: 60:4:1,

Give the error in indication in terms of 0C if the pressure

spring temperature changes by 0.50C only. (13)

2 Understand

5. Discuss the features of RTD and explain the working of RTD

in 3 wire configurations. (13) 2 Understand

6. Differentiate thermistor and RTD. Discuss about the

characteristics of materials used for resistance thermometers.

(13) 4 Analyze

7. Explain briefly about

(i) Primary fixed points. (8)

(ii) Secondary fixed points. (5)

4 Analyze

8. Explain with sketches, Where bimetallic elements are used as

(i) Temperature sensors. (8)

(ii) Compensating elements. (5) 4 Analyze

9. Draw the neat sketch and explain the construction and

working principle of vapour pressure thermometer. (13) 3 Apply

10. Explain in detail the RTD signal conditioning and their

characteristics. (13) 5 Evaluate

11. With neat sketch, describe the construction and working

principle of gas expansion type thermometer. (13) 1 Remember

12. With neat sketch, describe the construction and working principle

of Fluid expansion type thermometer. (13) 1 Remember

13. Compare and describe how bimetallic strip compensation is

different from differential link compensation. (13) 1 Remember

14. (i) List the sources of errors in filled-in thermometer (3)

(ii) Explain the above in detail (10) 1 Remember

PART – C

1. Develop RTD 4 wire configuration arrangement and

compare with the 3 wire configuration. (15) 6 Create

2. Summarize the notes on installation of Resistance

temperature detector. (15) 5 Evaluate

3. (i) A platinum thermometer has a resistance of 100 ohm

at 250C. (a) Evaluate its resistance at 65

0C if the

platinum has a resistance temperature co-efficient of

0.00392/ 0C. (b) If the thermometer has a resistance of

150 ohm. Calculate the temperature. (8) 5 Evaluate

(ii) Explain about the compensation technique’s used in

thermometers. (7)

4. Design helix and spiral Bimetallic thermometer. (15) 6 Create

UNIT V - TEMPERATURE MEASUREMENT - II

Thermocouples - Laws of thermocouple - Fabrication of industrial thermocouples – Signal

conditioning for thermocouple - isothermal block reference junctions - Commercial circuits for

cold junction compensation - Response of thermocouple - Special techniques for measuring high

temperature using thermocouple - Radiation fundamentals - Radiation methods of temperature

measurement - Total radiation pyrometers - Optical pyrometers - Two colour radiation

pyrometers -Fiber optic sensor for temperature measurement.

PART – A

Q.No Questions BT

Level Competence

1. State the selective radiation pyrometer principle. 1 Remember

2. On what factors does the response of thermocouple

depend on? 1 Remember

3. Discover the need for cold junction compensation. 1 Remember

4. List any four types of Thermocouples. 1 Remember

5. State what is pyrometer? 1 Remember

6. Explain the laws of thermocouple. 1 Remember

7. Describe thermopile. 2 Understand

8. Convert 1000 degree centigrade to degree Fahrenheit 2 Understand

9. Explain seeback effect. 2 Understand

10. Sketch the thermoelectric characteristics of

thermocouple. 2 Understand

11. Draw the transmission characteristics of various

optical materials. 3 Apply

12. Draw the response characteristics of different types of

radiation detectors. 3 Apply

13. Specify the composition of any three types of

thermocouples 2 Understand

14. Analyze the fabrication methods of thermocouple. 4 Analyze

15. What is the advantage of fiber optic senses and

instruments? 4 Analyze

16. Explain optical pyrometer. 4 Analyze

17. Discriminate the various images of filament and target.

used in optical pyrometer with neat diagram. 5 Evaluate

18. Summarize the different response criteria in which

radiation detector depends on. 5 Evaluate

19. Construct the mounting diagram of thermocouple. 6 Create

20. Write down the demerits of optical pyrometer. 6 Create

1. Describe the special techniques adopted for measuring

high temperature using thermocouples. (13) 1 Remember

2. Describe the construction of Thermocouple. (13) 1 Remember

3. (i) What is meant by Pyrometers? (5) 1 Remember

(ii) Describe the principle of two color radiation

pyrometers. (8) 4. (i) Describe the factors to be considered for the

selection of thermocouple. (8)

(10) 1 Remember (ii) Describe the advantages and disadvantages of

thermocouple? (5) 5. Explain about the principles of radiation used for

temperature measurement. (13) 4 Analyze

6. (i) Elaborate how the fiber optic temperature measurement

is advantageous than other methods. (8) 4 Analyze

(ii) Explain in detail about the cold junction compensation

used in thermocouple. (5)

7. (i) Summarize the advantages and disadvantages of

radiation pyrometer. (8) 2 Understand

(ii) Summarize the applications of radiation

pyrometer. (5)

8. Draw and explain the signal conditioning circuit diagram

of thermocouple. (13) 4 Analyze

9. (i) Prepare a report on commercial temperature

measuring methods. (8) 6 Create

(ii) Compare and contrast different types of

pyrometers. (5)

10. Explain about Isothermal block reference junctions in

thermocouple. (13) 5 Evaluate

11. (i) Describe the advantages and disadvantages of

optical pyrometer. (8) 2 Understand

(ii) Describe the applications of optical pyrometer in

detail. (5)

12. Interpret the working principle of

(i) Total radiation pyrometer. (8)

(ii) Optical pyrometer. (5) 2 Understand

13. Demonstrate the different types of thermocouple with

necessary specification. (13) 3 Apply

14. (i) Mention a short notes on Fabrication of industrial

thermocouple. (8)

3 Apply

(ii) Mention a notes on thermopile. (5)

PART – C

1. Explain in detail about the dynamic response of

thermocouple. (15) 5 Evaluate

2. (i) Evaluate the thermoelectric sensitivity of a device

using bismuth and tellurium as the dissimilar

metals. Estimate the maximum output voltage for

a 1000C temperature difference at room

temperature using one junction. The sensitivity of

bismuth is -72 microvolt/ 0C and that of tellurium

500 microvolt/ 0C. (8)

5

Evaluate

(ii) A copper constantan thermocouple was found to

have linear calibration between 0 and 4000C

with at maximum temperature (reference

junction temperature 00C) equal to 20.68mV. (a)

Evaluate the correction what must be made to the

indicated emf if the junction temperature is 250C.

(b) If the indicated emf is 8.92 mV in the

thermocouple circuit with reference junction at

250C. Determine the temperature of the hot

junction. (7)

3. Compose the basic laws of thermocouple. (15) 6 Create

4. Prepare a short note on installation and protection of

thermocouple. (15) 6 Create