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