Load QuizSave Quiz Welcome to your Electrician TT - 1st Year (set 2) 1. 2. Which device converts sunlight into electrical energy? Photo voltaic cell Liquid crystal diode Light emitting diode Light dependent resistor 3. Which law secondary cell works? Lenz’s law Joule’s law Faradays laws of electrolysis Faradays laws of electromagnetic induction 4. 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 5. How the capacity of batteries is specified? Volt Watt Volt Ampere Ampere hour 6. What is the name of defect that bending of plates in secondary cells? Buckling Local action Partial short Hard sulphation 7. What is the unit of electric charge? Volt Watt Ampere Coulomb 8. What is the output voltage of lithium cell? 1.2 V 1.5 V 1.8 V 2.5 V 9. 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 10. Which electrolyte used in carbon zinc dry cells? Dilute sulphuric acid Ammonium chloride Potassium hydroxide Concentrated hydrochloric acid 11. Which effect causes by passing electric current in liquids? | Heating Lighting Magnetic Chemical 12. Which material is used to make negative plates in lead acid battery? Lead dioxide Sponge lead Lead peroxide Lead sulphate 13. Which technique is used to control the corrosion of a metal surface? Anodic protection Cathodic protection Electrolytic protection Electrostatic protection 14. Which cell is most often used in digital watches? Voltaic Lithium Mercury Silver oxide 15. 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 16. 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 17. 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 18. 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 19. What is the formula for Faraday’s first law of electrolysis? M = Z/it M = Zit M = it/ Z M = Zt/i 20. Which is used as an electrolyte in lead acid battery? Hydrochloric acid Ammonium chloride Potassium hydroxide Diluted sulphuric acid 21. What is the total voltage of the circuit? Add description here! 1.5 Volt 6.0 Volt 7.5 Volt 9.0 Volt 22. 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 23. 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 24. In which method the battery is charged at low current for long period? Rectifier method Trickle charging method Constant current method Constant potential method 25. 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 26. Which material is used as cathode (-ve) electrode in silver oxide battery? Zinc Copper Carbon Silver oxide 27. 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 28. 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 29. Which instrument is used to measure the specific gravity of electrolyte in lead acid battery? Barometer Hydrometer Anima meter High rate discharge tester 30. Which type of inverter circuit? Add description here! Driven inverter SCR used inverter Single transistor inverter Two winding transformer inverter 31. 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 32. What is the total output voltage of the circuit? Add description here! 0 V 1.5 V 3.0 V 4.5 V 33. Which is used as a positive electrode in a dry cell? Zinc Carbon Copper Lithium 34. What happen to the terminal voltage of a cell if load increases? Increases Decreases Falls to zero Remains same 35. 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 36. 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 37. 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 38. 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 39. Which apparatus is used to check the charging condition of voltage in battery? Voltmeter Multimeter Hydrometer High rate discharge tester 40. Which part is losing electron during electrolysis? Cathode Anode Electrolyte Seperator 41. How the conduit pipes are specified Length in metre Wall thickness in mm Inner diameter in mm Outer diameter in mm 42. What is the fusing factor for rewireable fuse? 1.1 1.4 2.1 2.5 43. 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 44. What is the type of fuse? Knife edge cartridge fuse High rupturing capacity fuse Ferrule contact cartridge fuse Diazed screw type cartridge fuse 45. What is the name of electrical accessory? Bracket holder Edison screw type holder Angle swivel lamp holder Goliath Edison screw lamp holder 46. Goliath Edison screw lamp holder Link Fuse Pull switch Plug and socket 47. Which type of load is protected by the L-series MCB Motors Geyser Hand tools Air conditioner 48. Which type of switch is used in the circuit? One-way switch Two-way switch Intermediate switch Multiposition switch 49. What is the effect of low current rated cable used to connect higher current load? Voltage drop increases Load current increases Voltage drop decreases Cable damage due to heat 50. What is the name of the conduit accessory? Solid bend Solid elbow Inspection Bend Inspection elbow 51. How many two way switches with intermediate switch are used to control one lamp from three different places? 1 2 3 4 52. What is the advantage of concealed wiring? Easy to maintain Less voltage drop High insulation resistance Protection against moisture 53. What is the name of the diagram? Add description here! Installation plan Layout diagram Wiring diagram Circuit diagram 54. What is the fusing factor for high repturing capacity fuses (HRC)? 1.0 1.1 1.4 1.7 55. Which type of relay can be operated at both A.C and D.C? Ferred relay Thermal relay Impulse relay Dry reed relay 56. What is the name of the accessory used in electrical appliances? Add description here! 2 Pin plug Three pin plug Iron connector with direct entry Flat connector with side entry 57. What is the name of the accessory symbol? Add description here! Bell push switch Two way switch One way switch two poles Multi position switch single pole 58. What is the purpose of the flexible cords in domestic wiring? Concealed wiring Permanent connection Run cable through holes in ceiling Connection transportable appliances 59. Which type of circuit breaker is used above 100 A current rating? Miniature Circuit Breaker (MCB) Earth Leakage Circuit Breaker (ELCB) Moulded Case Circuit Breaker (MCCB) Residual Current Circuit Breaker (RCCB) 60. What is the purpose of tin coating on copper fuse wire? Withstand high temperature Increase the fusing factor Prevent oxidation of copper wire Increase the mechanical strength 61. What is the name of the four insulated conductors group? Pair Core Quad Layer 62. How many two way switches are required in godown wiring circuit to control four lamps 2 3 4 5 63. Which type of transformer is used for high frequency application? Ring core transformer Ferrite core transformer Silicon steel core transformer Grain oriented core transformer 64. What is the relationship between primary voltage (E1, V1) and secondary voltage (E2, V2) in a ideal transformer? E1= V1 and E2 = V2 E1 > V1 and E2 > V2 E1 < V1 and E2 < V2 E1 = V2 and E2 = V1 65. What is the function of conservator in transformer? Prevents the moisture entry Transfers the heat to atmosphere Allows to release internal pressure Allows expansion of oil level due to load variation 66. Which loss of transformer is determined by short circuit test? Copper loss Windage loss Hysteresis loss Eddy current loss 67. Calculate the voltage regulation in percentage of the transformer if the no load voltage is 240 volt and full load voltage is 220 volt? 7.2 % 8.3 % 8.71% 9.09% 68. What is the purpose of using laminated core in transformer? Reduce copper loss Reduce hysteresis loss Reduce mechanical loss Reduce eddy current loss 69. What is the cooling method of transformer? Oil natural cooling Oil natural air forced cooling Oil forced air forced cooling Oil natural water forced cooling 70. What is the condition for obtaining maximum efficiency from transformer? Copper loss > Iron loss Copper loss < Iron loss Copper loss = Iron loss Copper loss =Eddy current loss 71. What is the function of top float switch of buchholz relay in transformer? Activate in moisture presence Activate at overloading condition Activate at open circuit condition Activate at high temperature condition 72. Why the core of current transformer is having low reactance and low core losses? To minimise the burden To maintain constant output To prevent high static shield To minimise the error in reading 73. How the error in reading of a potential transformer can be reduced? Using thin laminated core Providing long magnetic path Using high flux density material Providing good quality core material 74. Why the load is disconnected before the OFF load tap changing operation? To disconnect the tappings from neutral point To disconnect the moving contact of the diverter To avoid heavy sparking at the contact points To provide an electrical isolation for the windings 75. What is the name of the part in power transformer? Breather Tap charger Explosion vent Buchholz relay 76. Which condition is absolutely essential for parallel operation of two transformers? Nature of load Type of cooling Phase sequence Class of insulation used 77. Which construction technique is used to reduce copper loss in larger transformers? Use of laminated core By reducing core thickness By using grain oriented core Use stepped core arrangement 78. What is the name of transformer? Air core transformer Iron core transformer Ring core transformer Ferrite core transformer 79. Which transformer is used to measure high voltage installations? Pulse transformers Ignition transformers Potential transformers Constant voltage transformers 80. How does the moisture is controlled in breather fitted on power transformers? | Using silica gel Using transformer oil Using sodium chloride Using ammonium jelly 81. Which power loss is assessed by open-circuit test on transformer? Hysteresis loss only Eddy current loss only Copper loss Core loss
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