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