8/10/2019 006011 ii ii Q. Key

1/16

Semester - V

006011/ INDUSTRIAL INSTRUMENTATION II

Regulation 2012PART-A (10 x 2 = 20 Marks

1. What are the advantages of using Venturitube as a restriction element?

Venturi is preferred when the

Measuring fluid contains large amount of slurries or suspended particles.

Accuracy of the flow measured should be high.

Pressure loss should be minimum

Coefficient of discharge should be high

2. Define Reynolds Number

Combination of density, viscosity of the fluid to a dimension describing length and the

average fluid velocity.

V is the mean fluid velocity (SI units:m/s)

LDiameter of the pipe (m)

is the viscosity of thefluid (Pas or Ns/m or kg/(ms))

is thedensity of the fluid (kg/m)3.

Write the expression for vortex frequency in vortex shedding flow meter.

Where f = Shedding frequency

V = Fluid velocityD = characteristic dimension of the bluff body

Nst = Strouhal number

4. What are the factors to be considered for the selection of flow meter?

Measurement requirements

External conditions of the flow pipe

Internal conditions of the flow pipe

Properties of the flowing fluid

Installation and accessories

Cost considerations

5. What is meant by Photo Electric Effect?

The Photoelectric effect is the observation that many metals emit electrons when lightshines upon them. Electrons emitted in this manner can be called photoelectrons.

6. What is shrinkage and swell effect in boiler drum?

It is a effect caused during a rapid increase in a load, a severe increase in level may occur.

Shrink and swell is the result of pressure changes in the drum changing the water density.

7. Define the term viscosity and density.

Viscosity is defined as the resistance that arises from the lack of slipperiness of

the parts of the liquid, other things being equal is proportional to the velocity with which

f = NstV / D

http://en.wikipedia.org/wiki/SI_unitshttp://en.wikipedia.org/wiki/Dynamic_viscosityhttp://en.wikipedia.org/wiki/Fluidhttp://en.wikipedia.org/wiki/Densityhttp://en.wikipedia.org/wiki/Densityhttp://en.wikipedia.org/wiki/Fluidhttp://en.wikipedia.org/wiki/Dynamic_viscosityhttp://en.wikipedia.org/wiki/SI_units

8/10/2019 006011 ii ii Q. Key

2/16

parts of the liquid are separated from one another. This lack of slipperiness is called

viscosity. Its unit is Nsm-2

.

Density is defined as the mass per unit volume of a substance under fixed

conditions. Its unit is kg/m3.

8. Differentiate Baume Scale and API Scale

9. Define Electromagnetic Interferences

10.List some methods of measurement of moisture?

The different types of moisture measurements are:Thermal drying method

Distillation methods

Chemical reaction methods

Electrical methods:Conductivity types

Capacitance types

PARTB (5 x 16 = 80 Marks)

11.A) Explain the construction and operation of an Orifice meter with neat diagram

(16).

8/10/2019 006011 ii ii Q. Key

3/16

8/10/2019 006011 ii ii Q. Key

4/16

OR

b) Explain the construction and working principle of Rotameter and derive the

expression for volume flow rate.

8/10/2019 006011 ii ii Q. Key

5/16

8/10/2019 006011 ii ii Q. Key

6/16

8/10/2019 006011 ii ii Q. Key

7/16

12. A) With neat diagram, discuss the construction and working of an Electromagnetic flow

meter.

OR

B) Explain the construction and working of Vortex Shedding Flow Meter.

8/10/2019 006011 ii ii Q. Key

8/16

8/10/2019 006011 ii ii Q. Key

9/16

13.A) What are the different electrical methods used for measurement of liquid level?

Describe the capacitance types of level measurements

8/10/2019 006011 ii ii Q. Key

10/16

OR

8/10/2019 006011 ii ii Q. Key

11/16

B) Explain the Boiler drum level measurement by differential pressure method with neat

sketch

8/10/2019 006011 ii ii Q. Key

12/16

8/10/2019 006011 ii ii Q. Key

13/16

8/10/2019 006011 ii ii Q. Key

14/16

14.a) With the neat sketch, explain the following.

i) Bridge Type Gas Densitometers

ii) Pressure Head Type Densitometers

8/10/2019 006011 ii ii Q. Key

15/16

OR

b) Discuss any two types of hygrometers used for humidity measurements

8/10/2019 006011 ii ii Q. Key

16/16

15.A) Explain the testing of electromagnetic interferences with neat diagram

OR

B) Write short notes moisture measurement in granular materials and wood