Power screws are required to have what characteristic for efficient power transmission?

• A. High efficiency
• B. Self-locking characteristic
• C. Low efficiency
• D. Over hauling characteristic

Answer: (A)

The characteristic required for power screws to ensure efficient power transmission is high efficiency. Power screws are used in various applications where a large amount of torque and force needs to be transmitted, such as in lifting mechanisms, jacks, and clamps.

High efficiency in power screws implies that a significant amount of the input energy is effectively converted into useful work, minimizing energy losses due to friction and other factors. This is particularly important in applications where energy conservation is critical or where consistent performance is needed under heavy loads. High-efficiency power screws can perform the required tasks more effectively and with less energy input, which is vital in both mechanical design and operational cost considerations.

Other characteristics, such as the self-locking feature, may be beneficial in specific applications to prevent back drive under certain conditions, but they do not directly address the efficiency of the power transmission process itself. Similarly, low efficiency and overhauling characteristics would not support the goal of effective and effective power transmission, as low efficiency would lead to higher energy losses and overhauling can hinder performance. Thus, focusing on high efficiency is essential for optimal power screw operation.