ELECTRICIAN 2nd YEAR MODULE – Inverter and UPS ONLINE TEST July 2, 2025July 2, 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 square wave inverters are used? DVD players Computers General lighting TV receiverQuestion 1 of 28Question 2 of 28 2. How the hard sulphation defect in secondary cell can be prevented? Provide freshening charge Provide trickle charging Provide constant potential method charging Provide constant current chargingQuestion 2 of 28Question 3 of 28 3. Which electrical device is actuating the voltages in a stepped voltage stabilizer? Under voltage relay Output transformer Autostat Over voltage relayQuestion 3 of 28Question 4 of 28 4. Which transformer is used in servo voltage stabilizer? Step up transformer Toroidal autotransformer Step down transformer Constant voltage transformerQuestion 4 of 28Question 5 of 28 5. What is the full form of UPS? Universal Power Supply Unregulated Power Supply Uninterrupted Power Supply Uniform Power SupplyQuestion 5 of 28Question 6 of 28 6. What is the reason for having low back up time in UPS? Fault in inverter circuit Ampere hour (A.H) capacity of battery is not sufficient Battery is short circuited Mains earthing is not properQuestion 6 of 28Question 7 of 28 7. How the backup time of UPS can be increased? Increase the AH capacity of battery Decrease the AH capacity of battery Increase the VA rating of UPS Maintain battery terminal voltage always 90% of ratingQuestion 7 of 28Question 8 of 28 8. What is the full form of PWM? Phase Wide Modulation Phase Width Modulation Pulse Wide Modulation Pulse Width ModulationQuestion 8 of 28Question 9 of 28 9. Which is the application of automatic stepped voltage stabilizer? Geyser Grinder Pump motor TelevisionQuestion 9 of 28Question 10 of 28 10. What is the advantage of on-line UPS over offline UPS? Supplies constant power output Works on single phase or three phase supply It gives constant output frequency Free from change over and transition problemsQuestion 10 of 28Question 11 of 28 11. Which is the function of an inverter? Converts A.C voltage into D.C voltage Converts D.C voltage into higher D.C voltage Converts D.C voltage into A.C voltage Converts A.C voltage into higher A.C voltageQuestion 11 of 28Question 12 of 28 12. What is the minimum permissible single phase working voltage, if the declared voltage is 240V as per ISI? 211 V 216 V 228 V 233 VQuestion 12 of 28Question 13 of 28 13. What is the reason for tripping the UPS with full load? Loose connection in battery terminal Incorrect over load settings Main supply failure Battery charger input fuse blown outQuestion 13 of 28Question 14 of 28 14. Which part in UPS supplies continuous output voltage in case of input voltage failure? Inverter unit Rectifier unit Controller unit Battery unitQuestion 14 of 28Question 15 of 28 15. Which is the cause for the fault if the output voltage of UPS is higher than normal? Input voltage is very high Defective feedback circuit Battery get short circuited Relay points are joined togetherQuestion 15 of 28Question 16 of 28 16. Calculate the voltage and ampere/hour, if four cells rated as 1.5 V and 8 A.H are in parallel? 4.5 V and 8 AH 3 V and 16 AH 1.5 V and 32 AH 6 V and 24 AHQuestion 16 of 28Question 17 of 28 17. What is the purpose of output transformer in inverters? Step up AC from amplifier Step down AC from amplifier Step down input AC Step up input ACQuestion 17 of 28Question 18 of 28 18. Which electronic circuit is used in an automatic voltage stabilizer to produce constant output voltage? Feedback circuit Rectifier circuit Amplifier circuit Oscillator circuitQuestion 18 of 28Question 19 of 28 19. Which type of output transformer is used in automatic voltage stabilizer? Auto transformer Static transformer Ferrite core type transformer Ring core type transformerQuestion 19 of 28Question 20 of 28 20. What is the effect during loading of the cell, the current strength falls and become zero? Local action Amalgamation Polarization BucklingQuestion 20 of 28Question 21 of 28 21. Which feedback network is used for automatic voltage stabilizer? Tapped transformer network Resistance temperature detector network Voltage divider network Current divider networkQuestion 21 of 28Question 22 of 28 22. What is the type of A.C voltage stabilizer? Constant voltage transformer stabilizer Servo voltage stabilizer Automatic voltage stabilizer Manual stepped voltage stabilizerQuestion 22 of 28Question 23 of 28 23. Which principle the constant voltage transformer works? Mutual induction principle Ferro-resonant principle Fall in potential principle Self induction principleQuestion 23 of 28Question 24 of 28 24. Which instrument is used to check short circuit faults in electronic circuit in voltage stabilizer? Multimeter Ohmmeter Ammeter VoltmeterQuestion 24 of 28Question 25 of 28 25. What are the important stages in a simple inverter? Amplifier and transformer output stages Oscillator, amplifier and transformer output stages Oscillator and rectifier stages Oscillator and amplifier stagesQuestion 25 of 28Question 26 of 28 26. Which is frequency converter? D.C to A.C converters Cyclo converters Rectifiers D.C choppersQuestion 26 of 28Question 27 of 28 27. Which term refers that the mass of a substance liberated from an electrolyte by one coulomb of electricity? Electro chemical equivalent Electro copying Electro plating ElectrolysisQuestion 27 of 28Question 28 of 28 28. What is the effect in internal resistance of a discharged cell? Becomes zero Decrease Increase Remain sameQuestion 28 of 28 Loading...
