1
GATE ME 2015 Set 3
Numerical
+2
-0
For ball bearings, the fatigue life $$L$$ measured in number of revolutions and the radial load $$F$$ are related by $$F{L^{1/3}} = K,$$ where $$K$$ is a constant. It withstands a radial load of $$2$$ $$kN$$ for a life of $$540$$ million revolutions. The load (in $$kN$$) for a life of one million revolutions is ___________.
Your input ____
2
GATE ME 2014 Set 1
Numerical
+2
-0
A hydrodynamic journal bearing is subject to $$2000$$ $$N$$ load at a rotational speed of $$2000$$ $$rpm.$$ Both bearing bore diameter and length are $$40mm.$$ If radial clearance is $$20\mu m$$ and bearing is lubricated with an oil having viscosity $$0.03$$ $$Pa.s,$$ the Sommerfeld number of the bearing is _______
Your input ____
3
GATE ME 2011
MCQ (Single Correct Answer)
+2
-0.6
Two identical ball bearings $$P$$ and $$Q$$ are operating at loads $$30kN$$ and $$45kN$$ respectively. The ratio of the life of bearing $$P$$ to the life of bearing $$Q$$ is
A
$$81/16$$
B
$$27/8$$
C
$$9/4$$
D
$$3/2$$
4
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
A journal bearing has a shaft diameter of $$40mm$$ and a length of $$40mm.$$ The shaft is rotating at $$20$$ $$rad/s$$ and viscocity of the lubricant is $$20mPa.s.$$ The clearance is $$0.020mm.$$ The loss of the torque due to viscocity of the lubricant is approximately
A
$$0.040$$ $$Nm$$
B
$$0.252$$ $$Nm$$
C
$$0.400$$ $$Nm$$
D
$$0.652$$ $$Nm$$
GATE ME Subjects
Turbo Machinery
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Medical
NEET
Graduate Aptitude Test in Engineering
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CBSE
Class 12