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