EI1301 Industrial Instrumentation B.E Question Bank : niceindia.com

Name of the College : Noorul Islam College of Engineering
University : Anna University
Degree : B.E
Department : Electronics and Instrumentation Engineering
Subject Code/Name : EI 1301 – Industrial Instrumentation
Document Type : Question Bank
Website : niceindia.com

Download Model/Sample Question Paper :https://www.pdfquestion.in/uploads/niceindia.com/3016-EI_1301_INDUSTRIAL_INSTRUMENTATION-1.pdf

NICE Industrial Instrumentation Question Bank

UNIT-I

1.Define force :
Force may be defined as a cause that produces resistance or obstruction to any moving body or change the motion of a body.

Related : Noorul Islam College of Engineering IC1401 Computer Control Process B.E Question Bank : www.pdfquestion.in/3011.html

2. Define speed :
Speed is a variable which refers to the revolutions per minute of some piece of rotating equipment.

3. Which is the most frequently used speed measuring instrument? :
Tachometer

4. What are the types of tachometer? :
a) A.C. tacho generator
b) D.C. tacho generator

5. What are the types of D.C.tacho generator? :
a) Permanent magnet type
b) Separately excited field type

6. What are the disadvantages of D.C. tacho generator? :
A.C. ripple is present in the output signal. The magnitude of the ripple is 2% of the out[ut D.C.level.

7. Name the types of rotor used in A.C.tacho generators :
a) Drag cup rotor
b) Squirrel cage rotor

8.What are the advantages of Squirrel cage rotor? :
*Cheaper
*Occupies less space

9. Give some applications of drag cup tacho generator :
It is commonly used in the speedometers of motor vehicles and as a speed indicator for aeroengines.

10. Give the formula to calculate the shaft speed :
Shaft spped = (disk speed * No. of openings in the disk) / No.of images

11. Define torque :
Torque is defined as the force which tends to change the linear motion or rotation of a body.

12. What is the other name for inline stationary torque sensor? :
Relative regular twist torque sensor

13. What are the types of torque transducer? :
i) Inline rotating torque sensor
ii) Inline stationary torque sensor
iii) Optical torque sensor
iv) Proximity torque sensor

14. Write the relationship between torque and force :
T = F . D
where T -> Torque
F -> Force
D -> Perpenticular distance between the axis of rotation of the line of action of the force

15. What are the advantages of optical torque sensor? :
Low cost, small physical size

16. Write the formula for determining the actual speed in a stroboscope :
Actual speed ,fr =fl fn (n-1) / ( fn – fl )
fn is the highest flashing speed
fl is the lowest flashing speed
n is the no. of flashing frequencies

17. Define load cell :
Load cell are devices that convert force into pressure , which are then measured.

18. Write down the range, accuracy and resolution in hydrostatic or hydraulic load cell :
Range of force measurement = 0 to 30000 N
Accuracy = 0.1%
Resolution = 0.02%

19. Why magneto elastic load cell is also called pressductor load cell? :
The degree of change has a direct relationship with the applied stress or force. So it is called pressductor load cell.

20. What are the advantages of magneto elastic load cell? :
** Extremely robust transducer
** Produces relatively high output signal levels
** Overload ratings are as high as 15 times the rated loads

UNIT-II

1. What are the advantages of using Baume sclae?
It is used for liquids both higher and heavier than water.

2. Write the abbreviation of API scale.
API – American Petroleum Institute

3. Write the disadvantages of bridge type gas densitometer.
The major disadvantage is that the variations in ambient temperature will introduce errors.

4. Write the formula for determining the height in a pressure head type densitometer.
H = Span / Specific gravity maximum – Specific gravity minimum

5. Give some of the materials which are used for the manufacturing of a float.
Pyrex, Plastic

6. For what purpose accelerometers are used?
• For the measurement of shock & vibration
• For gross measurement of acceleration of vehicles like aircraft, submarines etc.

7. What are the advantages of LVDT?
• It is used for steady state and low freequency vibration measurements.
• Smaller amss, so, it is used for the measurement of vibrations of higher frequencies.

8. Define piezo electric effect.
If the dimension of crystal are changed by the application of a mechanical force, an electrical potential appears across the crystal. This effect is called piezo electric effect.

9. What are the features of piezo electric accelerometers?
• Small in size and weight
• It can be used for vibration and shock measurements.
• High output impedence
• Their response is poor at low frequencies

10. List some of the applications of strain gauge accelerometers.
It is used for the measurement of acceleration and vibration in vehicles, aircrafts, bridges, hoists, cranes & lifts.

UNIT-III

1)What are the main parts of an electrical pressure transducer?
(a) Pressure sensing element such as a bellow, a diaphl11gm or a bourdon tube.
(b) Primary conversion element. e. g resistance or voltage.
(c) Secondary conversion element.

2) What are the advantages of strain gauge pressure transducer?
(i) Small & easy to install
(ii) Good accuracy
(iii) More stable
(iv) Fast speed response
(v) Simple to maintain

3) What are the disadvantages of strain gauge pressure transducer?
(i) High cost
(ii) Requires constant voltage supply.
(iii) Electrical readout is necessary.
(iv) Temperature compensation is required.

4) What is the principle of operation of a piezoelectric pressure transducer?
When pressure is applied to a piezoelectric crystal such as quartz, an electrical charge is generated.

5) What are the types of thermal conductivity gauges?
(a) Pirani gauge
(b) Thermocouple gauge