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