IOCL Junior Operator Electrical MCQ || IOCL Junior Operator General Science Questions and Answers51. How is flux activity classified?1 . By its color 2 . By its corrosive properties. 3 . By its smell. 4 . By its melting point Answer and SolutionAnswer: "By its corrosive properties. " Fluxes are classified as slightly or highly corrosive depending on their activity. Flux activity is mainly classified based on how corrosive it is. This means it’s grouped by how much it can damage or affect other materials. Discuss52. What determines the flux to be used?1 . The color of the metal 2 . The size of the soldering iron 3 . The temperature of the room 4 . The type of solder Answer and SolutionAnswer: "The type of solder " The type of solder determines the flux to be used. Different solders require different fluxes for optimal performance. Discuss53. What does the solidification range of solder refer to?1 . The temperature range over which the solder changes from liquid to solid 2 . The time it takes for the solder to heat. 3 . The length of the solder wire. 4 . The power of the soldering iron. Answer and SolutionAnswer: "The temperature range over which the solder changes from liquid to solid " The solidification range of solder refer to the temperature range over which the solder changes from liquid to solid. he solidification range influences the joint’s formation. Discuss54. What is essential for the solder to adhere correctly?1 . A rough surface. 2 . High pressure 3 . A clean, oxide-free surface 4 . Bright lighting Answer and SolutionAnswer: "A clean, oxide-free surface "Cleanliness of the metal surfaces is crucial for a strong solder joint. Discuss55. What is the composition of Plumbing/Tinman's solder?1 . 60% Tin, 40% Lead 2 . 40% Tin, 60% Lead 3 . 63% Tin, 37% Lead 4 . 50% Tin, 50% Lead Answer and SolutionAnswer: "50% Tin, 50% Lead "Plumbing/Tinman’s solder is composed of 50% Tin and 50% Lead. Discuss56. What is the working temperature of Electrician's solder in Celsius?1 . 185°C 2 . 212°C 3 . 365°C 4 . 183°C Answer and SolutionAnswer: "185°C "The working temperature of Electrician’s solder is 185°C (or 365°F). Discuss57. Which type of solder is used for heavy-duty soldering?1 . Fine solder 2 . Plumbing/Tinman’s solder 3 . Electrician’s solder 4 . None of the above Answer and SolutionAnswer: "Plumbing/Tinman’s solder "Plumbing/Tinman’s solder is used for “Heavy duty soldering.” Discuss58. Which solder is specifically mentioned for tinning electrical joints?1 . Plumbing/Tinman’s solder 2 . Electrician’s solder 3 . Fine solder 4 . All of the above Answer and SolutionAnswer: "Electrician’s solder "Electrician’s solder includes “Tinning and soldering electrical joints etc.” Discuss59. What is the percentage of Lead in Fine solder?1 . 50% 2 . 40% 3 . 60% 4 . 37% Answer and SolutionAnswer: "37% "Fine solder consists of 63% Tin and 37% Lead. Discuss60. Which flux is suitable for soldering cast iron and mild steel?1 . Zinc chloride (acidic) 2 . Rosin 3 . Tallow 4 . Sal ammonia rosin Answer and SolutionAnswer: "Zinc chloride (acidic) "Zinc chloride (acidic)” is the suitable flux for “Cast iron, wrought iron, mild steel, cast steel. Discuss1234567
