IOCL Junior Operator MCQ Part-8 || IOCL Junior Operator General Science Questions and Answers41. What property of PVC makes it suitable for use in a wide range of environmental conditions?1 . High conductivity 2 . High flexibility 3 . Low manufacturing cost. 4 . Mechanical toughness Answer and SolutionAnswer: "Mechanical toughness "PVC’s mechanical toughness means it can withstand physical stress and temperature variations without significant degradation, making it versatile. Discuss42. What is the primary method of classifying underground cables?1 . By the type of insulating material used 2 . By the type of sheath used 3 . By the number of cores 4 . By the voltage for which they are manufactured Answer and SolutionAnswer: "By the voltage for which they are manufactured "Voltage rating is the most significant factor in classifying underground cables, as it dictates the insulation requirements and construction. Discuss43. What voltage range defines Low-Tension (L.T) cables?1 . Up to 11 kV 2 . 22 kV to 33 kV 3 . 33 kV to 66 kV 4 . Up to 1100 V Answer and SolutionAnswer: "Up to 1100 V " Low-tension (L.T) cables are used for voltages up to 1100 V. These cables are designed for low-voltage applications. L.T cables are designed for applications where the voltage is relatively low, typically for domestic and light industrial use. Discuss44. What is the voltage range for High-tension (H.T) cables?1 . Up to 11,000 V 2 . Up to 1100 V 3 . From 22 KV to 33 KV 4 . From 33 KV to 66 KV Answer and SolutionAnswer: "Up to 11,000 V "High-tension (H.T) cables are used for voltages up to 11,000 V. These cables are suitable for medium-voltage applications. Discuss45. What is the voltage range for Super-tension (S.T) cables?1 . Up to 1100 V 2 . Up to 11,000 V 3 . From 22 KV to 33 KV 4 . From 33 KV to 66 KV Answer and SolutionAnswer: "From 22 KV to 33 KV "Super-tension (S.T) cables are used for voltages from 22 KV to 33 KV. These cables are designed for higher voltage applications. Discuss46. What is the voltage range for Extra high-tension (E.H.T) cables?1 . Up to 1100 V 2 . Up to 11,000 V 3 . From 22 KV to 33 KV 4 . From 33 KV to 66 KV Answer and SolutionAnswer: "From 33 KV to 66 KV "Extra high-tension (E.H.T) cables are used for voltages from 33 KV to 66 KV. These cables are suitable for very high voltage applications. Discuss47. What is the voltage range for Extra super voltage cables?1 . Up to 1100 V 2 . Up to 11,000 V 3 . From 22 KV to 33 KV 4 . Beyond 132 KV Answer and SolutionAnswer: "Beyond 132 KV "Extra super voltage cables are used for voltages beyond 132 KV. These cables are designed for ultra-high voltage applications. Discuss48. For a 3-phase service, what are the two main types of cable configurations used?1 . Three single-core cables 2 . three-core cable. 3 . Both 2 and 3 4 . Three-core and four-core. Answer and SolutionAnswer: "Both 2 and 3 "Depending on voltage and load requirements, either individual single-core cables or a single three-core cable can be used. Discuss49. What is the primary material used for the core of a single-core low-tension cable?1 . Steel 2 . Tinned stranded copper or aluminum 3 . Lead 4 . Plastic Answer and SolutionAnswer: "Tinned stranded copper or aluminum "The core of a single-core low tension cable is typically made of tinned stranded copper or aluminium. This material provides good conductivity and durability. Discuss50. What is the purpose of the lead sheath in a single-core low-tension cable?1 . To carry current 2 . To provide mechanical strength. 3 . To prevent moisture entry. 4 . To add flexibility Answer and SolutionAnswer: "To prevent moisture entry. "The lead sheath in a single-core low tension cable is used to prevent the entry of moisture into the inner parts of the cable, ensuring the insulation remains effective. Discuss123456789
