FireTeam Mechanical Aptitude - Part 2.1 Questions Answers 2024-2025, Exams of Mechanical Engineering

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FireTeam Mechanical Aptitude - Part 2.1 Questions Answers 2024-2025 1. Consider the belt drive system. Which of the following statements i is true? outpur a. B turns anti-clockwise at 50 RPM i ove Yow b. C turns anti-clockwise at 25 RPM = 4 sn c. Aand C turn clockwise and B turns anti-clockwise a ——— d. C turns clockwise at 400 RPM ome 4 4 e. C turns clockwise at 25 RPM: e. C turns clockwise at 25 RPM Explanation: Axle A is the start of the system, as indicated by the word ‘input.’ The disc on axle A is half the diameter of the one it is directly connected to on axle B. So, for every 1 rotation of A, B would perform half a rotation. The second disc on axle B is connected to a disc on axle C, and is once again half the diameter of the disc on C. So, for every 1 rotation of B, there is half a rotation of C. So, for every 1 rotation of A, there is 0.5 rotations of B, and therefore 0.25 rotations of C. If Ais rotating at 100 RPM (revolutions per minute), then C is rotating at a quarter of that, or 25 RPM.Axle A rotates clockwise, so B and C will also rotate in the same direction. 2. Which of the above systems requires the least force at F to lift the weight of d. They are all the same 5 w a e. B and C do not work: c. C Explanation: C would require the least force to lift the weight. This is because of the pulley system employed in scenario C. The more pulleys you have the more parts of the rope act on the weight. 3. Considering the above systems, if you want to lift the weight by 100mm, which rope will have to be pulled further? a.A b.B | c.c 5 Y d. They are all the same ‘ e. B and C do not work: c.C a ry rn Explanation: C would require the greatest length of rope to lift the weight by that distance. The distance that the weight is lifted by depends on how many pulleys there are. Each pulley used is an occasion when the rope is looped around. The 1/7