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