• # question_answer A shaft of 50 mm diameter and 1 m length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is 90% of critical speed in microns is: A) 810                              B) 900C) 800                              D) 820

$r=\frac{e{{\beta }^{2}}}{1-{{\beta }^{2}}}=\frac{190\times {{(0.9)}^{2}}}{1-{{(0.9)}^{2}}}=810\,\,microns$