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