30 Jun 2025 ELECTRICIAN 1st YEAR MODULE – Wiring Installation and Earthing by admin | posted in: nimi online test, NSQF, NSQF LEVEL 4 | 0 0% Question 1 of 28 1. How to control harmonic distortions in neutral connections per IE rules? Providing plate earthing Earthing through impedance Providing parallel earthing Increasing conductor sizeQuestion 1 of 28Question 2 of 28 2. Why does megger's pointer not stabilize at zero when unused? No controlling torque Deflecting torque proportional to current Air friction damping Deflecting torque proportional to current²Question 2 of 28Question 3 of 28 3. What happens when a person receives a 20mA shock current? Heart convulsions Painful shock No sensation UnconsciousnessQuestion 3 of 28Question 4 of 28 4. Why is system earthing different from equipment earthing? It protects from all circuit faults It's associated with current-carrying conductors It protects humans only It's connected to non-current-carrying metal partsQuestion 4 of 28Question 5 of 28 5. Which principle does the earth resistance tester work on? Self induction Mutual induction Fall of potential method Fleming's left hand ruleQuestion 5 of 28Question 6 of 28 6. For which electrical equipment are 'L' series type MCBs used? Air conditioners Locomotives Geysers Halogen lampsQuestion 6 of 28Question 7 of 28 7. Why is AC required to measure earth resistance using an earth resistance tester? To decrease the voltage drop To avoid electrolytic emf interference To increase the voltage drop To regulate the currentQuestion 7 of 28Question 8 of 28 8. Which instrument is used to test new domestic wiring installation? Shunt-type ohmmeter Multimeter Megger Series-type ohmmeterQuestion 8 of 28Question 9 of 28 9. Why is AC supplied for earth resistance measurement? Protect meter coils Avoid electrolytic emf interference Reduce meter current Provide electrostatic shieldQuestion 9 of 28Question 10 of 28 10. 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 10 of 28Question 11 of 28 11. What is the formula to find voltage drop in an AC single-phase wiring circuit? Voltage drop = IR/2 volt Voltage drop = IR volt Voltage drop = I²R volt Voltage drop = I/R voltQuestion 11 of 28Question 12 of 28 12. What test is carried out using a megger? Earth conductor continuity test Insulation resistance test Earth electrode resistance test Polarity testQuestion 12 of 28Question 13 of 28 13. What is the megger reading in a dead short wiring installation? 500 MΩ 1 MΩ Infinity 0 MΩQuestion 13 of 28Question 14 of 28 14. What is the maximum permissible load for a power sub-circuit as per IE rules? 800 Watt 3000 Watt 2000 Watt 1500 WattQuestion 14 of 28Question 15 of 28 15. How can earth resistance be reduced? Increasing electrode length Decreasing electrode length Reducing pit depth Providing double earthingQuestion 15 of 28Question 16 of 28 16. What determines ohmmeter needle deflection in earth testers? Handle rotation speed Current in potential coil Ratio of currents in two coils Current in current coilQuestion 16 of 28Question 17 of 28 17. What is the permissible leakage current in domestic wiring installation? 1/500 × Full load current 1/5 × Full load current 1/5000 × Full load current 1/50 × Full load currentQuestion 17 of 28Question 18 of 28 18. In which wiring installation is system earthing done? Domestic wiring Substations Godown wiring Commercial wiringQuestion 18 of 28Question 19 of 28 19. Advantage of stranded conductor over solid conductor? Less voltage drop Cost is less More insulation resistance More flexibleQuestion 19 of 28Question 20 of 28 20. What type of test is performed in wiring installation? Open circuit test Insulation resistance test between conductors and earth Polarity test Insulation resistance test between conductorsQuestion 20 of 28Question 21 of 28 21. Where is system earthing done? Electroplating installation Domestic wiring installation Small industrial installation Generating stationQuestion 21 of 28Question 22 of 28 22. What type of test is conducted in domestic wiring installation? Insulation resistance test between conductors Continuity (or) open circuit test Insulation resistance test between conductors and earth Polarity testQuestion 22 of 28Question 23 of 28 23. Which earth resistance measurement method is illustrated? Potential dividing Fall of current Current dividing Fall of potentialQuestion 23 of 28Question 24 of 28 24. What is the advantage of crimping? Neat appearance Avoids loose connections Easy replacement Reduces load currentQuestion 24 of 28Question 25 of 28 25. 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 Increasing the diameter of the earth electrode Keeping wet condition in earth pits alwaysQuestion 25 of 28Question 26 of 28 26. What causes lamps to glow dim and motors to run slow in domestic wiring? Open circuit in neutral line High value series resistance fault Short circuit between conductors Open circuit in earth conductorQuestion 26 of 28Question 27 of 28 27. What is the function of current reverser in earth resistance testers? Converts AC to DC Reverses DC polarity Changes DC supply to AC Reverses generator rotation directionQuestion 27 of 28Question 28 of 28 28. Where are service connection supply leads connected in a consumer main board? IC cut out Main switch Distribution board Energy meterQuestion 28 of 28 Loading...
Leave a Reply