IOCL Junior Operator MCQ Part-8 || IOCL Junior Operator General Science Questions and Answers1. What is the purpose of the cores in a cable?1 . To provide insulation. 2 . To protect from moisture. 3 . To add mechanical strength. 4 . To conduct electricity. Answer and SolutionAnswer: "To conduct electricity. "Cores are the conductors that carry the electrical current. Discuss2. Why are conductors often stranded?1 . To make them heavier 2 . To increase flexibility. 3 . To reduce conductivity. 4 . To make them rigid. Answer and SolutionAnswer: "To increase flexibility. " Conductors are usually stranded in order to provide flexibility to the cable. Stranding makes the cable easier to bend and handle. Discuss3. What determines the thickness of the insulation?1 . The length of the cable 2 . The voltage the cable must withstand. 3 . The color of the cable 4 . The weight of the cable Answer and SolutionAnswer: "The voltage the cable must withstand. " The thickness of the insulation on a cable is primarily determined by the voltage the cable must withstand. This is because higher voltages require thicker insulation to prevent electrical breakdown and ensure safety. Discuss4. What material is commonly used for cable insulation?1 . Impregnated paper 2 . Varnished cambric 3 . Rubber 4 . All of the above Answer and SolutionAnswer: "All of the above " Cable insulation is often made from materials like impregnated paper, varnished cambric, or rubber. These materials help keep electricity inside the cable and prevent it from leaking. They are good at stopping electrical currents from leaking out, making them safe and effective for use in cables. Discuss5. What is the purpose of the metallic sheath?1 . To carry current. 2 . To add flexibility. 3 . To provide insulation. 4 . To protect from moisture and gases. Answer and SolutionAnswer: "To protect from moisture and gases. "The sheath creates a barrier against environmental damage and protect the cable from moisture and gases. Discuss6. What materials are used for the metallic sheath?1 . Plastic 2 . aluminum 3 . Both 1 and 2 4 . Rubber Answer and SolutionAnswer: "Both 1 and 2 "Metallic sheath is made up of lead or aluminium and it is provided over the insulation. Discuss7. What is the purpose of the paper belt?1 . To provide mechanical strength. 2 . To insulate grouped cores. 3 . To protect from corrosion. 4 . To add flexibility. Answer and SolutionAnswer: "To insulate grouped cores. " Layer of imprignated paper tape is wound round the grouped insulated cores. The paper belt adds extra insulation and fills gaps. Discuss8. What is the purpose of bedding?1 . To protect the metallic sheath 2 . To provide insulation. 3 . To increase conductivity. 4 . To add color to the cable. Answer and SolutionAnswer: "To protect the metallic sheath " The purpose of bedding is to protect the metallic sheath from corrosion and mechanical damage. Bedding acts as a cushion for the metallic sheath. Discuss9. What material is used for bedding?1 . Metal 2 . Plastic 3 . Rubber 4 . Jute or hessian tape Answer and SolutionAnswer: "Jute or hessian tape " Jute or hessian tape is used for bedding. These fibrous materials provide a protective layer. Discuss10. What is the purpose of armouring?1 . To provide insulation 2 . To protect the cable from mechanical injury. 3 . To carry current. 4 . To add flexibility Answer and SolutionAnswer: "To protect the cable from mechanical injury. " Armouring protect the cable from mechanical injury while laying it and during the course of handling. Armouring prevents damage during laying and handling. Discuss123456789
