IOCL Junior Operator Electrical MCQ || IOCL Junior Operator General Science Questions and Answers41. What is the minimum fusing current?1 . The maximum current the fuse can withstand. 2 . The rated current of the fuse. 3 . The current at which the fuse operates optimally. 4 . The minimum current at which the fuse melts. Answer and SolutionAnswer: "The minimum current at which the fuse melts. "Minimum fusing current is defined as the minimum current at which the fuse melts. Discuss42. What is the current rating of a fuse?1 . The minimum current at which the fuse melts. 2 . The instantaneous surge current. 3 . The average current the fuse handles. 4 . The maximum current the fuse can withstand without melting. Answer and SolutionAnswer: "The maximum current the fuse can withstand without melting. "The maximum current the fuse can withstand without melting is called current rating of a fuse. Discuss43. Soldering is a Process of ______1 . Melting two metals together to fuse them. 2 . Joining two metals using an alloy with a lower melting point. 3 . Welding metals with high heat. 4 . Gluing metals with a special adhesive. Answer and SolutionAnswer: "Joining two metals using an alloy with a lower melting point. " Soldering is a Process of Joining metals with a lower melting point alloy without melting the metals. Soldering uses a solder alloy that melts at a lower temperature than the base metals. Discuss44. Why is soldering necessary for wire and cable joints?1 . To achieve good mechanical strength and electrical conductivity. 2 . To make the joints look better. 3 . To increase the joint’s temperature. 4 . To make the wires longer. Answer and SolutionAnswer: "To achieve good mechanical strength and electrical conductivity. " Soldering is necessary for wire and cable joints to achieve good mechanical strength and electrical conductivity and also to avoid corrosion Mechanical joints alone don’t provide these qualities. Discuss45. What is the alloy commonly used for soft soldering?1 . Copper and zinc. 2 . Aluminum and magnesium. 3 . Iron and nickel. 4 . Tin and lead. Answer and SolutionAnswer: "Tin and lead. "Tin and lead alloys are widely used for soft soldering due to their low melting point. Discuss46. Which factor influences the choice of solder?1 . Color of the metals. 2 . Size of the tools. 3 . Room temperature. 4 . Melting point. Answer and SolutionAnswer: "Melting point. "The melting point of the solder must be compatible with the metals being joined and the application. The other important factor of soldering include Place of use Melting point Solidification range Strength, hardness Sealability Price Discuss47. What is the purpose of flux in soldering?1 . To cool the metals. 2 . To increase the melting point of solder. 3 . To dissolve oxides and prevent re-oxidation. 4 . To add color to the solder. Answer and SolutionAnswer: "To dissolve oxides and prevent re-oxidation. " The flux is used to dissolve oxides on the surface of conductors and to protect against de-oxidisation during the soldering process. Flux cleans the metal surfaces, allowing the solder to bond effectively. Discuss48. What does flux dissolve on the surface of conductors?1 . Oxides and sulfides. 2 . Grease. 3 . Dust. 4 . Water. Answer and SolutionAnswer: "Oxides and sulfides. " The flux dissolve on the surface of conductors are Oxides and sulfides. Oxides and sulfides prevent the solder from adhering to the metal. Discuss49. How does flux help the solder flow?1 . By increasing the heat. 2 . By changing the solder’s color. 3 . By reducing surface tension. 4 . By making the solder thicker. Answer and SolutionAnswer: "By reducing surface tension. "Flux lowers surface tension, allowing the molten solder to spread easily. Discuss50. What are the states of flux?1 . Hot and cold 2 . Magnetic and non-magnetic. 3 . Solid and liquid 4 . Heavy and light Answer and SolutionAnswer: "Solid and liquid "Flux can be available in various forms, including paste (solid) and liquid. Discuss1234567
