Electrical Measurements 3rd MJ13 080300004
| B.E/B.TECH. DEGREE EXAMINATION, MAY/JUNE 2013 Third Semester Electronics and Instrumentation Engineering 080300004-ELECTRICAL MEASUREMENTS (Regulation 2008/2010) ANNA UNIVERSITY SYLLABUS - Click Here Download PDF File - Click Here PART A-(10*2=20 marks) 1. How can the range of instrument be extended in PMMC instruments? 2. Define calibration. 3. Define phantom loading. 4. Define creeping. 5. Give the classifications of AC potentiometers. 6. Define ratio error. 7. Define megger. 8. When is the Wheatstone bridge balanced? 9. Which types of detector is used in ac bridges? 10. What is the use of Campbell Bridge? PART B-(5*16=80 marks) 11. (a) Briefly explain the construction and working principles of PMMC instruments. Or (b) With the neat diagram explain the principle and working of dynamometer type instruments Also mention its advantages. 12. (a) Briefly explain the working principle of electrodynamometer type wattmeter with a neat Sketch and necessary equation. Or (b) Explain the step by step procedure for calibrating LPF wattmeter by phantom loading. 13. (a) Explain the current and potential transformer with equivalent and vector diagram. Or (b) Write short notes on: (i) DC potentiometer (ii) Drysdale type potentiometer. 14. (a) Write necessary derivation explain the Kelvin double bridge circuit for very low value Resistance measurement. Or (b) What is megger? Explain the construction and working principle of megger. 15. (a) Explain the measurement of inductance using Maxwell-wein's bridge circuit. Or (b) Write short notes on : (i) Vibration galvanometer (ii) Campbell bridge.  |
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