DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGG
EX 303 (ELECTRICAL INSTRUMENTATION)
IMPORTANT QUESTIONS (For PUT)
1. Describe in detail systematic type of errors.
2. What do you understand by accuracy, precision, sensitivity and resolution.
3. Describe the construction and working of a vibration galvanometer Derive the expression for amplitude of vibration.
4. What are the various techniques by which damping torque is produced in an electrical measuring instrument.
5. Describe the construction of ballistic galvanometer.
6. Give classification of analog instruments.Discuss briefly operating principle,damping and controlling of each instrument.
7. Explain the constructional features of flex mater.
8.Discuss the construction, working, advantage and disadvantage of PMMC instrument.
9.Discuss the construction, working, advantage and disadvantage of MIinstrument.
10. Explain the use of shunt as a device for extending the range of ammeter.
11. How would you extend the range of electrostatic voltmeter.
12. What do you know about rectifier instruments.Explain the principle with the help of circuit diagram.
13. Discuss the construction, working, advantage and disadvantage of electrodynameter instrument.
14. What do you know about induction instruments.
15. Discuss the construction, working, advantage and disadvantage of electrostatic instrument.

16. Derive the expression for ration and phase angle errors of potential transformers..
17. Explain clearly eith the help of phasor diagram the principle of current transformers.
18. Prove that two wattmetera are sufficient for measurement of balanced by unbalanced load.
19. Explain the construction and working of an electrodynamometer type of wattmeter.
20. Describe any one method for testing of potential transformers.
21. Show with the help of neat diagram how would you extend range of wattmeter using CT and PT.
22. Describe in detail the working of a tri-vector mater.
23. Explain the sources of errors and their compensation in single phase induction type energy meter.
24. What are the different tests performed on single phase induction type energy meter.
25. Describe briefly an ampere hour meter and explain how the meter is compensated for effect of fluid friction at high loads.
26. Draw a connection diagram of Crompton potentiometer.
27. Describe the construction and working of polar type ac potentiometer.
28. Describe with the help of neat diagram the loss of chagre method to determine the insulation resistance of a short length of cable.
29. Explain the method of reversal for experimental determination of hysteresis loop.
30. What are the diffifulties associated with the measurement of low resistance.
31. Describe the lioyd fisher square for measurement of iron losses in a specimen of laminations.
32. Describe the construction and working of vibration reed freq mater.
33. Explain with neat diagram working principle of resonanc type and Weston type freq mater.
Prepared By : Vivek K Koshta