IOCL Junior Operator Electrical MCQ || IOCL Junior Operator General Science Questions and Answers31. What is the rating factor for cables with coarse excess current protection?1 . 1.23 2 . 1.5 3 . 0.81 4 . 1.0 Answer and SolutionAnswer: "0.81 " The rating factor for cables with coarse excess current protection is 0.81. The permissible current is 81% of the normal current capacity for coarse protection. Discuss32. What is the rating factor for cables with close excess current protection?1 . 0.81 2 . 1.0 3 . 1.5 4 . 1.23 Answer and SolutionAnswer: "1.23 " The rating factor for cables with close excess current protection is 1.23. The permissible current is 123% of the normal current capacity for close protection. Discuss33. If the normal current carrying capacity of a 1.5 sq mm copper cable is 16 amps, what is the permissible current with coarse protection?1 . 12.96 amps 2 . 16 amps 3 . 19.68 amps 4 . 24 amps Answer and SolutionAnswer: "12.96 amps "Multiply the normal capacity by the rating factor for coarse protection (0.81). 16 amps * 0.81 = 12.96 amps Discuss34. Why do stranded conductors have better insulation properties and cooling in underground cables?1 . They are cheaper. 2 . They are easier to install. 3 . They are more rigid. 4 . The space between strands allows oil flow. Answer and SolutionAnswer: "The space between strands allows oil flow. "The gaps in stranded cables facilitate the flow of insulating and cooling oil. Discuss35. Which of the following voltage classifications is considered Low Voltage (LV)?1 . 251V to 650V 2 . 651V to 33000V 3 . Above 33000V 4 . 0V to 250V Answer and SolutionAnswer: "0V to 250V " 0V to 250V voltage classifications is considered Low Voltage (LV). Low voltage is defined as not exceeding 250V. Discuss36. Which of the following voltage classifications is considered Medium Voltage (MV)?1 . 0V to 250V 2 . 251V to 650V 3 . 651V to 33000V 4 . Above 33000V Answer and SolutionAnswer: "251V to 650V " 251V to 650V voltage classifications is considered Medium Voltage (MV). Medium voltage is defined as exceeding 250V but not exceeding 650V. Discuss37. Which of the following voltage classifications is considered High Voltage (HV)?1 . 0V to 250V 2 . 251V to 650V 3 . 651V to 33000V 4 . Above 33000V Answer and SolutionAnswer: "651V to 33000V " 651V to 33000V is considered as High Voltage. High voltage is defined as exceeding 650V but not exceeding 33000V. Discuss38. Voltages above 33000V are classified as:1 . Low voltage 2 . Medium voltage 3 . High voltage 4 . Extra high voltage Answer and SolutionAnswer: "Extra high voltage "Voltages beyond 33000V fall into the extra high voltage category. Discuss39. Why is the length of the circuit important in determining current carrying capacity?1 . It affects the permissible voltage drop. 2 . It changes the color of the cable. 3 . It changes the ambient temperature. 4 . It changes the type of insulation. Answer and SolutionAnswer: "It affects the permissible voltage drop. "Longer circuits experience greater voltage drops, which can reduce the effective current carrying capacity. Discuss40. What is the fusing factor?1 . The ratio of minimum fusing current to current rating of the fuse. 2 . The ratio of maximum current to minimum current. 3 . The ratio of voltage rating to current rating. 4 . The ratio of resistance to current rating. Answer and SolutionAnswer: "The ratio of minimum fusing current to current rating of the fuse. "The ratio of minimum fusing current to current rating of the fuse is called fusing factor. Discuss1234567
