MAE 1351 Exam 3 Questions and Answers | Latest Update | 2024/2025 | 100% Pass

MAE 1351 Exam 3 Questions and Answers | Latest Update | 2024/2025 | 100% Pass What is the primary function of a heat exchanger in thermal systems? A heat exchanger transfers thermal energy between two or more fluids without mixing them, facilitating efficient heating or cooling processes in various applications. How does the principle of conservation of energy apply to mechanical systems? The principle of conservation of energy states that energy cannot be created or destroyed, only transformed; in mechanical systems, this means input energy must equal output energy under ideal conditions. What is the significance of understanding stress and strain in material science? Understanding stress and strain helps engineers predict how materials will deform under load, ensuring structures and components can withstand applied forces without failure. What role do gears play in mechanical advantage? Gears transmit torque and change rotational speed, providing mechanical advantage that allows a smaller force to lift heavier loads or achieve higher speeds. 2 How does fluid pressure relate to fluid velocity in a pipe system? According to Bernoulli’s principle, an increase in fluid velocity results in a decrease in fluid pressure, illustrating the trade-off between speed and pressure in fluid dynamics. What is the purpose of a governor in engine systems? A governor regulates the speed of an engine by adjusting the fuel supply or throttle position to maintain a desired output speed under varying load conditions. How does thermal expansion affect the design of bridges? Thermal expansion causes materials to expand or contract with temperature changes, requiring engineers to incorporate expansion joints to accommodate movement and prevent structural damage. What factors influence the selection of bearing types in machinery? Factors such as load capacity, speed, friction, and environmental conditions dictate the choice of bearing type, impacting the performance and longevity of machinery. How does the concept of resonance affect mechanical design? 3 Resonance occurs when a system is subjected to vibrations at its natural frequency, which can amplify movements; designers must avoid resonance to prevent mechanical failure. What is the function of a camshaft in an internal combustion engine? The camshaft controls the timing of valve openings and closings, playing a crucial role in engine performance by optimizing the air-fuel mixture intake and exhaust gas expulsion. What is the relationship between torque and rotational speed in motors? Torque and rotational speed are inversely related in motors; as torque increases, rotational speed decreases and vice versa, impacting the overall efficiency of motor operation. What is the significance of a finite element analysis in engineering design? Finite element analysis (FEA) allows engineers to simulate and assess how materials and structures respond to various forces, improving