ELECTRICIAN 1st YEAR MODULE – Wiring Installation and Earthing June 13, 2026June 30, 2025 by admin TRANSLATE THIS QUIZ IN YOUR LANGUAGE इस प्रश्नोत्तरी का अपनी भाषा में अनुवाद करें [google-translator] <<12345678910111213141516171819202122232425262728>> 0% Question 1 of 28 1. What causes lamps to glow dim and motors to run slow in domestic wiring? High value series resistance fault Open circuit in earth conductor Short circuit between conductors Open circuit in neutral lineQuestion 1 of 28Question 2 of 28 2. What is the megger reading in a dead short wiring installation? 0 MΩ 500 MΩ Infinity 1 MΩQuestion 2 of 28Question 3 of 28 3. What happens when a person receives a 20mA shock current? Unconsciousness No sensation Heart convulsions Painful shockQuestion 3 of 28Question 4 of 28 4. How to control harmonic distortions in neutral connections per IE rules? Earthing through impedance Providing plate earthing Increasing conductor size Providing parallel earthingQuestion 4 of 28Question 5 of 28 5. Why is system earthing different from equipment earthing? It protects humans only It's connected to non-current-carrying metal parts It protects from all circuit faults It's associated with current-carrying conductorsQuestion 5 of 28Question 6 of 28 6. Why is AC supplied for earth resistance measurement? Provide electrostatic shield Reduce meter current Protect meter coils Avoid electrolytic emf interferenceQuestion 6 of 28Question 7 of 28 7. Why does megger's pointer not stabilize at zero when unused? Deflecting torque proportional to current² Deflecting torque proportional to current Air friction damping No controlling torqueQuestion 7 of 28Question 8 of 28 8. Which instrument is used to test new domestic wiring installation? Megger Series-type ohmmeter Shunt-type ohmmeter MultimeterQuestion 8 of 28Question 9 of 28 9. What is the advantage of crimping? Neat appearance Easy replacement Reduces load current Avoids loose connectionsQuestion 9 of 28Question 10 of 28 10. How can earth resistance be reduced? Decreasing electrode length Reducing pit depth Providing double earthing Increasing electrode lengthQuestion 10 of 28Question 11 of 28 11. Which method is used to reduce earth resistance value in an existing earth pit? Increasing the diameter of the earth electrode Increasing the length of the electrode Keeping wet condition in earth pits always Adding more sand and charcoal in earth pitsQuestion 11 of 28Question 12 of 28 12. What is the permissible leakage current in domestic wiring installation? 1/50 × Full load current 1/5000 × Full load current 1/5 × Full load current 1/500 × Full load currentQuestion 12 of 28Question 13 of 28 13. What is the maximum permissible load for a power sub-circuit as per IE rules? 3000 Watt 2000 Watt 800 Watt 1500 WattQuestion 13 of 28Question 14 of 28 14. What determines ohmmeter needle deflection in earth testers? Ratio of currents in two coils Current in current coil Current in potential coil Handle rotation speedQuestion 14 of 28Question 15 of 28 15. Where are service connection supply leads connected in a consumer main board? Main switch Energy meter IC cut out Distribution boardQuestion 15 of 28Question 16 of 28 16. For which electrical equipment are 'L' series type MCBs used? Air conditioners Geysers Locomotives Halogen lampsQuestion 16 of 28Question 17 of 28 17. What type of test is conducted in domestic wiring installation? Polarity test Insulation resistance test between conductors and earth Insulation resistance test between conductors Continuity (or) open circuit testQuestion 17 of 28Question 18 of 28 18. Advantage of stranded conductor over solid conductor? More insulation resistance Less voltage drop Cost is less More flexibleQuestion 18 of 28Question 19 of 28 19. What test is carried out using a megger? Earth electrode resistance test Insulation resistance test Polarity test Earth conductor continuity testQuestion 19 of 28Question 20 of 28 20. In which wiring installation is system earthing done? Substations Godown wiring Domestic wiring Commercial wiringQuestion 20 of 28Question 21 of 28 21. 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 21 of 28Question 22 of 28 22. 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 22 of 28Question 23 of 28 23. What is the formula to find voltage drop in an AC single-phase wiring circuit? Voltage drop = I/R volt Voltage drop = IR/2 volt Voltage drop = IR volt Voltage drop = I²R voltQuestion 23 of 28Question 24 of 28 24. Which earth resistance measurement method is illustrated? Potential dividing Fall of current Fall of potential Current dividingQuestion 24 of 28Question 25 of 28 25. Where is system earthing done? Small industrial installation Generating station Electroplating installation Domestic wiring installationQuestion 25 of 28Question 26 of 28 26. What type of test is performed in wiring installation? Open circuit test Insulation resistance test between conductors Polarity test Insulation resistance test between conductors and earthQuestion 26 of 28Question 27 of 28 27. Why is AC required to measure earth resistance using an earth resistance tester? To avoid electrolytic emf interference To decrease the voltage drop To regulate the current To increase the voltage dropQuestion 27 of 28Question 28 of 28 28. Which principle does the earth resistance tester work on? Fall of potential method Fleming's left hand rule Self induction Mutual inductionQuestion 28 of 28 Loading...
