Electrician TT – 1st Year (set 2)By pulak.univ / February 3, 2024 Welcome to your Electrician TT - 1st Year (set 2) 1. Which device converts sunlight into electrical energy? Photo voltaic cell Liquid crystal diode Light emitting diode Light dependent resistor None 2. Which law secondary cell works? Lenz’s law Joule’s law Faradays laws of electrolysis Faradays laws of electromagnetic induction None 3. What is the formula to calculate the Mass deposited during electrolysis? M = it gm M = zit gm M = it/z gm M = z/it gm None 4. How the capacity of batteries is specified? Volt Watt Volt Ampere Ampere hour None 5. What is the name of defect that bending of plates in secondary cells? Buckling Local action Partial short Hard sulphation None 6. What is the unit of electric charge? Volt Watt Ampere Coulomb None 7. What is the output voltage of lithium cell? 1.2 V 1.5 V 1.8 V 2.5 V None 8. What is the method of charging if the battery is to be charged for short duration at higher rate? Initial charge Boost charge Trickle charge Freshening charge None 9. Which electrolyte used in carbon zinc dry cells? Dilute sulphuric acid Ammonium chloride Potassium hydroxide Concentrated hydrochloric acid None 10. Which effect causes by passing electric current in liquids? | Heating Lighting Magnetic Chemical None 11. Which material is used to make negative plates in lead acid battery? Lead dioxide Sponge lead Lead peroxide Lead sulphate None 12. Which technique is used to control the corrosion of a metal surface? Anodic protection Cathodic protection Electrolytic protection Electrostatic protection None 13. Which cell is most often used in digital watches? Voltaic Lithium Mercury Silver oxide None 14. What is the effect if one cell is connected with reverse polarity in a parallel combination circuit? Voltage become zero Become open circuit Will get short circuited No effect will function normally None 15. What is the function of fine selector switch in battery charger? Selection of current rating Selection of charging time Selection of voltage range Selection of charging method None 16. What is the effect on output power with respect to temperature in solar cells? No effect on change in temperature Increases with increase in temperature Decreases with increase in temperature Decreases with decrease in temperature None 17. What purpose the hydrometer is used during charging of battery? Determine the AH capacity Assess the battery voltage level Assess the discharge level of battery Determine the specific gravity of electrolyte None 18. What is the formula for Faraday’s first law of electrolysis? M = Z/it M = Zit M = it/ Z M = Zt/i None 19. Which is used as an electrolyte in lead acid battery? Hydrochloric acid Ammonium chloride Potassium hydroxide Diluted sulphuric acid None 20. What is the total voltage of the circuit? Add description here! 1.5 Volt 6.0 Volt 7.5 Volt 9.0 Volt None 21. What is the outcome at the positive plate, after the chemical reaction in lead acid battery during charging? Sponge lead(Pb) Lead peroxide(PbO2) Lead sulphate(PbSO4) Lead sulphate + water None 22. Why the vent plug is kept open during charging of a battery? To escape the gas freely To allow oxygen enter inside To check the level of electrolyte To check the colour changes in the plates None 23. In which method the battery is charged at low current for long period? Rectifier method Trickle charging method Constant current method Constant potential method None 24. How the hard sulphation defect in lead acid battery can be rectified? Changing with new electrolyte Replacing with new electrodes Recharging the battery for a longer period at low current Recharging the battery for short period at high curren None 25. Which material is used as cathode (-ve) electrode in silver oxide battery? Zinc Copper Carbon Silver oxide None 26. What is the Electro Chemical Equivalent (ECE) of silver? 0.001182 mg/coulomb 0.01182 mg/coulomb 0.1182 mg/coulomb 1.1182 mg/coulomb None 27. What is the purpose of separator in lead acid battery? To provide a path for electrolyte To hold the positive and negative plate firmly To avoid short in between the positive and negative plates To keep positive and negative plate in a sequence array None 28. Which instrument is used to measure the specific gravity of electrolyte in lead acid battery? Barometer Hydrometer Anima meter High rate discharge tester None 29. Which type of inverter circuit? Add description here! Driven inverter SCR used inverter Single transistor inverter Two winding transformer inverter None 30. What is the effect of buckling defect in a lead acid battery? Bending of the electrodes Reducing the strength of electrolyte Making short between the electrodes Increasing the internal resistance None 31. What is the total output voltage of the circuit? Add description here! 0 V 1.5 V 3.0 V 4.5 V None 32. Which is used as a positive electrode in a dry cell? Zinc Carbon Copper Lithium None 33. What happen to the terminal voltage of a cell if load increases? Increases Decreases Falls to zero Remains same None 34. How local action defect is prevented in voltaic cell? By connecting cells in series By using a depolarizing agent By connecting cells in parallel By amalgamating the zinc plate None 35. What does the letter Z indicate in the formula M=Z/it Time in seconds E.C.E of electrolyte Amount of current in Amp Mass deposited in grams None 36. What is the Electro Chemical Equivalent (ECE) of copper? 0.329 mg / coulomb 0.329 g/ coulomb 1.1182 mg / coulomb 1.1182 g/ coulomb None 37. Which is the cause for buckling defect in lead acid battery? Overcharging or over discharging Charging with low rate for short period Formation of sediments falling from the plate Battery is kept in discharged condition for long period None 38. Which apparatus is used to check the charging condition of voltage in battery? Voltmeter Multimeter Hydrometer High rate discharge tester None 39. Which part is losing electron during electrolysis? Cathode Anode Electrolyte Seperator None 40. How the conduit pipes are specified Length in metre Wall thickness in mm Inner diameter in mm Outer diameter in mm None 41. What is the fusing factor for rewireable fuse? 1.1 1.4 2.1 2.5 None 42. What is the purpose of underwriter’s knot for pendent holder connection? Avoid loose connections Increase mechanical strength Prevent excessive cap cover pressure Reduce the strain from the terminals of accessories None 43. What is the type of fuse? Knife edge cartridge fuse High rupturing capacity fuse Ferrule contact cartridge fuse Diazed screw type cartridge fuse None 44. What is the name of electrical accessory? Bracket holder Edison screw type holder Angle swivel lamp holder Goliath Edison screw lamp holder None 45. Goliath Edison screw lamp holder Link Fuse Pull switch Plug and socket None 46. Which type of load is protected by the L-series MCB Motors Geyser Hand tools Air conditioner None 47. Which type of switch is used in the circuit? One-way switch Two-way switch Intermediate switch
