ELECTRICIAN 1st YEAR MODULE – Wiring Installation and Earthing July 2, 2025June 30, 2025 by admin TRANSLATE THIS QUIZ IN YOUR LANGUAGE इस प्रश्नोत्तरी का अपनी भाषा में अनुवाद करें <<12345678910111213141516171819202122232425262728>> 0% Question 1 of 28 1. How can earth resistance be reduced? Providing double earthing Decreasing electrode length Reducing pit depth Increasing electrode lengthQuestion 1 of 28Question 2 of 28 2. What type of test is conducted in domestic wiring installation? Insulation resistance test between conductors Continuity (or) open circuit test Insulation resistance test between conductors and earth Polarity testQuestion 2 of 28Question 3 of 28 3. Which principle does the earth resistance tester work on? Fall of potential method Fleming's left hand rule Mutual induction Self inductionQuestion 3 of 28Question 4 of 28 4. Advantage of stranded conductor over solid conductor? More flexible Less voltage drop Cost is less More insulation resistanceQuestion 4 of 28Question 5 of 28 5. For which electrical equipment are 'L' series type MCBs used? Halogen lamps Air conditioners Geysers LocomotivesQuestion 5 of 28Question 6 of 28 6. What is the megger reading in a dead short wiring installation? 0 MΩ Infinity 500 MΩ 1 MΩQuestion 6 of 28Question 7 of 28 7. Why does megger's pointer not stabilize at zero when unused? Deflecting torque proportional to current² Air friction damping No controlling torque Deflecting torque proportional to currentQuestion 7 of 28Question 8 of 28 8. How to control harmonic distortions in neutral connections per IE rules? Increasing conductor size Providing parallel earthing Providing plate earthing Earthing through impedanceQuestion 8 of 28Question 9 of 28 9. Which earth resistance measurement method is illustrated? Fall of current Fall of potential Potential dividing Current dividingQuestion 9 of 28Question 10 of 28 10. Where are service connection supply leads connected in a consumer main board? Main switch IC cut out Distribution board Energy meterQuestion 10 of 28Question 11 of 28 11. What determines ohmmeter needle deflection in earth testers? Current in current coil Handle rotation speed Current in potential coil Ratio of currents in two coilsQuestion 11 of 28Question 12 of 28 12. Which instrument is used to test new domestic wiring installation? Series-type ohmmeter Multimeter Shunt-type ohmmeter MeggerQuestion 12 of 28Question 13 of 28 13. What is the formula to find voltage drop in an AC single-phase wiring circuit? Voltage drop = IR/2 volt Voltage drop = I²R volt Voltage drop = I/R volt Voltage drop = IR voltQuestion 13 of 28Question 14 of 28 14. Where is system earthing done? Domestic wiring installation Electroplating installation Generating station Small industrial installationQuestion 14 of 28Question 15 of 28 15. What is the maximum permissible load for a power sub-circuit as per IE rules? 3000 Watt 800 Watt 1500 Watt 2000 WattQuestion 15 of 28Question 16 of 28 16. What causes lamps to glow dim and motors to run slow in domestic wiring? Open circuit in earth conductor Open circuit in neutral line High value series resistance fault Short circuit between conductorsQuestion 16 of 28Question 17 of 28 17. What happens when a person receives a 20mA shock current? Heart convulsions Unconsciousness No sensation Painful shockQuestion 17 of 28Question 18 of 28 18. Why is system earthing different from equipment earthing? It protects humans only It protects from all circuit faults It's connected to non-current-carrying metal parts It's associated with current-carrying conductorsQuestion 18 of 28Question 19 of 28 19. What is the function of current reverser in earth resistance testers? Reverses generator rotation direction Reverses DC polarity Converts AC to DC Changes DC supply to ACQuestion 19 of 28Question 20 of 28 20. Why is AC supplied for earth resistance measurement? Provide electrostatic shield Avoid electrolytic emf interference Protect meter coils Reduce meter currentQuestion 20 of 28Question 21 of 28 21. What type of test is performed in wiring installation? Open circuit test Insulation resistance test between conductors Insulation resistance test between conductors and earth Polarity testQuestion 21 of 28Question 22 of 28 22. What is the advantage of crimping? Neat appearance Easy replacement Reduces load current Avoids loose connectionsQuestion 22 of 28Question 23 of 28 23. What is the permissible leakage current in domestic wiring installation? 1/500 × Full load current 1/50 × Full load current 1/5000 × Full load current 1/5 × Full load currentQuestion 23 of 28Question 24 of 28 24. In which wiring installation is system earthing done? Godown wiring Commercial wiring Domestic wiring SubstationsQuestion 24 of 28Question 25 of 28 25. Why is AC required to measure earth resistance using an earth resistance tester? To avoid electrolytic emf interference To regulate the current To increase the voltage drop To decrease the voltage dropQuestion 25 of 28Question 26 of 28 26. Which method is used to reduce earth resistance value in an existing earth pit? Keeping wet condition in earth pits always Increasing the length of the electrode Increasing the diameter of the earth electrode Adding more sand and charcoal in earth pitsQuestion 26 of 28Question 27 of 28 27. What test is carried out using a megger? Polarity test Earth conductor continuity test Earth electrode resistance test Insulation resistance testQuestion 27 of 28Question 28 of 28 28. What is the minimum size of copper earth continuity conductor used in single-phase domestic wiring as per BIS? 1.5 Sq.mm 2.5 Sq.mm 3.5 Sq.mm 3 Sq.mmQuestion 28 of 28 Loading...
