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B.E.C.E PAST QUESTIONS

For a 150 kg load on a DT 406 with ( d_s = 0.005 ) m (5 mm), ( f_n \approx 7 ) Hz. If the machine runs at 30 Hz (1800 RPM), isolation exceeds 90%.

Where ( f ) = machine running frequency (Hz) and ( f_n ) = natural frequency of the mounted system. For DT 406, with static deflection ( d_s ) in meters:

[ \eta = 1 - \frac1(f/f_n)^2 - 1 ]

In industrial and mechanical engineering—particularly in contexts involving motors, pumps, compressors, and HVAC systems—the code refers to a specific standard for elastic mountings (rubber-metal buffers). To "mount with DT 406" means to secure a component using a defined set of vibration isolators that follow the dimension and load rating of the DT 406 series.