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 megger reading in a dead short wiring installation? 500 MΩ 1 MΩ Infinity 0 MΩQuestion 1 of 28Question 2 of 28 2. What type of test is performed in wiring installation? Insulation resistance test between conductors Polarity test Open circuit test Insulation resistance test between conductors and earthQuestion 2 of 28Question 3 of 28 3. In which wiring installation is system earthing done? Godown wiring Substations Domestic wiring Commercial wiringQuestion 3 of 28Question 4 of 28 4. What is the permissible leakage current in domestic wiring installation? 1/5 × Full load current 1/500 × Full load current 1/5000 × Full load current 1/50 × Full load currentQuestion 4 of 28Question 5 of 28 5. What is the maximum permissible load for a power sub-circuit as per IE rules? 1500 Watt 3000 Watt 2000 Watt 800 WattQuestion 5 of 28Question 6 of 28 6. What is the formula to find voltage drop in an AC single-phase wiring circuit? Voltage drop = IR/2 volt Voltage drop = I/R volt Voltage drop = I²R volt Voltage drop = IR voltQuestion 6 of 28Question 7 of 28 7. How can earth resistance be reduced? Reducing pit depth Providing double earthing Increasing electrode length Decreasing electrode lengthQuestion 7 of 28Question 8 of 28 8. What is the advantage of crimping? Easy replacement Reduces load current Avoids loose connections Neat appearanceQuestion 8 of 28Question 9 of 28 9. 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 9 of 28Question 10 of 28 10. What determines ohmmeter needle deflection in earth testers? Current in potential coil Ratio of currents in two coils Current in current coil Handle rotation speedQuestion 10 of 28Question 11 of 28 11. What causes lamps to glow dim and motors to run slow in domestic wiring? Open circuit in neutral line Open circuit in earth conductor Short circuit between conductors High value series resistance faultQuestion 11 of 28Question 12 of 28 12. Which principle does the earth resistance tester work on? Self induction Fleming's left hand rule Mutual induction Fall of potential methodQuestion 12 of 28Question 13 of 28 13. Which earth resistance measurement method is illustrated? Potential dividing Fall of current Current dividing Fall of potentialQuestion 13 of 28Question 14 of 28 14. Where are service connection supply leads connected in a consumer main board? Distribution board IC cut out Main switch Energy meterQuestion 14 of 28Question 15 of 28 15. Which method is used to reduce earth resistance value in an existing earth pit? Adding more sand and charcoal in earth pits Increasing the length of the electrode Keeping wet condition in earth pits always Increasing the diameter of the earth electrodeQuestion 15 of 28Question 16 of 28 16. What happens when a person receives a 20mA shock current? Heart convulsions No sensation Painful shock UnconsciousnessQuestion 16 of 28Question 17 of 28 17. Where is system earthing done? Electroplating installation Generating station Small industrial installation Domestic wiring installationQuestion 17 of 28Question 18 of 28 18. What test is carried out using a megger? Insulation resistance test Polarity test Earth electrode resistance test Earth conductor continuity testQuestion 18 of 28Question 19 of 28 19. What is the function of current reverser in earth resistance testers? Converts AC to DC Reverses generator rotation direction Reverses DC polarity Changes DC supply to ACQuestion 19 of 28Question 20 of 28 20. What type of test is conducted in domestic wiring installation? Insulation resistance test between conductors and earth Polarity test Continuity (or) open circuit test Insulation resistance test between conductorsQuestion 20 of 28Question 21 of 28 21. What is the minimum size of copper earth continuity conductor used in single-phase domestic wiring as per BIS? 1.5 Sq.mm 3.5 Sq.mm 3 Sq.mm 2.5 Sq.mmQuestion 21 of 28Question 22 of 28 22. How to control harmonic distortions in neutral connections per IE rules? Providing parallel earthing Providing plate earthing Increasing conductor size Earthing through impedanceQuestion 22 of 28Question 23 of 28 23. Advantage of stranded conductor over solid conductor? More insulation resistance Cost is less More flexible Less voltage dropQuestion 23 of 28Question 24 of 28 24. Why does megger's pointer not stabilize at zero when unused? Air friction damping Deflecting torque proportional to current No controlling torque Deflecting torque proportional to current²Question 24 of 28Question 25 of 28 25. Why is AC supplied for earth resistance measurement? Reduce meter current Provide electrostatic shield Avoid electrolytic emf interference Protect meter coilsQuestion 25 of 28Question 26 of 28 26. For which electrical equipment are 'L' series type MCBs used? Air conditioners Geysers Locomotives Halogen lampsQuestion 26 of 28Question 27 of 28 27. Which instrument is used to test new domestic wiring installation? Megger Shunt-type ohmmeter Multimeter Series-type ohmmeterQuestion 27 of 28Question 28 of 28 28. Why is system earthing different from equipment earthing? It's associated with current-carrying conductors It protects humans only It's connected to non-current-carrying metal parts It protects from all circuit faultsQuestion 28 of 28 Loading...
