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Electrical Measurement MCQ Question Set 2

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1. Why a Wheatstone bridge can’t be used for signal conditioning?




2. How to minimize the drift in the value of resistance measured using a Wheatstone bridge?




3. Low resistance refers to _____




4. What is the significance of measuring low resistances?




5. How is the voltage drop across a low resistance related to lead resistance?




6. Which is not a source of error in the measurement of low resistance?




7. Which is the most popular method for measuring low resistance?




8. How is the contact resistance related to the circuit while measuring a low resistance?




9. Kelvin’s bridge consists of _______




10. The range of resistance measured in a Kelvin bridge is _____




11. Accuracy of Kelvin bridge is of the order of _______




12. What is the effect of load and contact resistance in Kelvin bridge?




13. The relation between ratio of resistance arms and ratio of resistance arms of second bridge is ____




14. Why Kelvin bridge is used for measurement of low resistance?




15. What is the condition to achieve a high sensitivity in a Kelvin bridge?




16. Kelvin bridge can be calibrated to read ____




17. Why can’t a Kelvin bridge be used for the measurement of low Quality factor value?




18. High resistances are of the order of _____




19. Megger is a ________




20. Megger is also used for _____




21. Megger works on the principle of ______




22. The role of the permanent magnet in a megger is to ________




23. A guard ring is provided in a megger to ________




24. The supply to the megger is given by ________




25. The moving element of the ohmmeter in a megger consists of ______




26. The role of the compensating coil in a megger is ________




27. Why is the scale of a megger calibrated in megaohms?




28. Megger can be used for verifying the electrical insulation level of _______




29. Continuity between any two points can be measured using ______




30. Electrical continuity between any two points exists if ______




31. Megger is also known as _____




32. The application of a megger is _____




33. What is the significance of a megger with respect to high resistance?




34. How is the megger calibrated?




35. What is earthing?




36. What is an earth electrode?




37. Earth electrode provides _____




38. How is the condition of an earth electrode measured?




39. In a three phase system, the neutral is ____




40. Earthing is used as return conductor in telephone lines and for traction work.




41. Earthing does not help in protecting the equipment.




42. After earthing, the different parts of an electrical machinery are at _____




43. Connection of the various parts of a circuit to earth has a ______




44. Specific resistance of soil is _______




45. The readings of polar type potentiometer are I = 12.4∠27.5°, V = 31.5∠38.4°. Then, reactance of the coil will be ______




46. The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. Find the magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m.




47. Low resistance is measured by _______




48. The resistance can be measured most accurately by _______




49. A slide wire potentiometer has 10 wires of 2 m each. With the help of a standard voltage source of 1.045 V, it is standardized by keeping the jockey at 104.5 cm. If the resistance of potentiometer wires is 2000 Ω, then the value of working current is?




50. A resistor of 10 kΩ with the tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. What is the tolerance limit for a parallel network?