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