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