【Pump Technology Edition: Daily Question】January 12, 2020 (Spring Festival bonus: 10 Wealth points for those who answer correctly before the answers are revealed)
Thread Content
71. After the compressor starts up, the main oil pump begins to operate, causing the pressure in the oil system to rise; at this point, the auxiliary oil pump should be stopped and the interlock switch should be set to the () position. A. Combined B. Manual C. Automatic. The answer to the question from yesterday was: C. 70. The most prominent feature of an optical image-level compared to a frame-level is (C). A. Good versatility B. High precision C. Wide measurement range (Answers are released the day before they are made public; those who get it right before the release receive 10 wealth points, those who get it right after the release receive 5 wealth points, and those who participate receive 3 wealth points)
c I didn’t understand the measurement range for the question from yesterday; I’ve never used optical instruments before. The accuracy of a frame level is 0.02 mm/m per grid, and its measurement range consists of only a few grids. For example, when it comes to the verticality requirement of an air-cooled spindle, which is 0.5 mm/m, it’s impossible to measure this using a frame level – the error would exceed the instrument’s range.