Let’s all answer question 63: Basic mechanical knowledge

Thread Content

We welcome everyone to actively participate in the learning and discussion of basic mechanical knowledge! True or False 1. The error of a measuring instrument refers to the indication error of that instrument, which is caused by factors such as its design, manufacturing, and assembly. 2. When the inherent error of the measuring instrument cannot be ignored, a correction value should be applied to adjust the measurement result. 3. When using a straightness gauge to check the straightness of the guide rail, the accuracy grade of the gauge should be lower than that of the guide rail being tested. 4. A fuse is a simplest and most effective electrical device for short-circuit protection. 5. In lighting and electric heating circuits, the rated current of the fuse should be lower than the operating current of the load in the circuit. 6. In a circuit where an asynchronous motor is started directly, the motor’s rated current should be 2.5 to 3 times the rated current of the copper fuse. 7. The overload protection of the motor does not rely on fuses. 8. Thermal relays cannot be used as short-circuit protection. 9. The setting current of the thermal relay selected should be equal to the rated current of the motor. 10. During the production process, it is often necessary to control the travel distance of certain moving parts of the manufacturing machinery, and this can be achieved using combination switches. Reference answers: Right, Right, Wrong, Right, Wrong, Wrong, Right, Right, Right, Wrong. Please choose hidden mode when responding: Hide method, Do not hide, No scoring