ELECTRICIAN 1st YEAR MODULE – Measuring Instruments

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Question 1 of 37

1. Which electrical effect does a single-phase energy meter work on?

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2. Which measuring error is caused by magnetic field effects?

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3. Calculate the shunt resistance needed to measure 10mA with a 1mA meter:

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4. What type of frequency meter is this?

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5. How to achieve maximum accuracy in analog instrument measurements?

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6. What happens if a CT's secondary is kept open?

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7. In which position should spring-controlled instruments be used?

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Question 8 of 37

8. What is the function of soft iron core in moving coil instruments?

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9. What material is used for shunt resistances?

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10. Which is an absolute instrument?

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Question 11 of 37

11. In which position should instruments with gravity control be used?

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12. Which type of energy meter works with neutral connection?

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13. Which force is required to move the pointer from zero position in an indicating instrument?

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14. What is the function of an integrating instrument?

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15. What type of wattmeter is this?

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16. What type of scale is this?

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17. What is the unit of instrument sensitivity?

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18. What is the purpose of the 3rd terminal in advanced megohm meters?

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19. What type of meter is this?

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20. Which instruments typically use air friction damping?

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21. How to identify a moving iron type instrument?

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22. What error occurs when an energy meter disc rotates continuously without load?

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23. Why are two straight holes provided in an energy meter's aluminum disc?

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Question 24 of 37

24. Why do moving coil meters have uniform scales?

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25. Which instrument accurately measures resistances of 1 ohm and below?

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Question 26 of 37

26. What is the purpose of the variable resistor connected across a shunt-type ohmmeter?

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27. Which parameter causes loading effect in measuring instruments?

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28. Which quantity is measured by an electrodynamometer type instrument?

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29. Which instrument is an example of an integrating instrument?

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30. How is creeping error controlled in energy meters?

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31. Which meter measures motor revolutions per minute?

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32. Which error occurs due to incorrect instrument positioning during reading?

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33. Why do moving iron instruments have non-uniform scales?

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34. What type of instrument is this?

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Question 35 of 37

35. What type of instrument is this?

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36. Which material is used to make control springs in measuring instruments?

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Question 37 of 37

37. Why is damping force required in moving coil instruments?

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