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GATE 2022 ME: Machine Design Quiz - 5

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Question 1

The life of a ball bearing at a load of 10 kN is 8000 hours. Its life in hours, if the load is increased to 20 kN, keeping all other conditions the same, is

Question 2

In case of Partial Journal Bearing, the angle of contact between the Bush and Journal is

Question 3

It is required to design a Hydrodynamic journal bearing for a bearing pressure of 1.7 N/mm2. The load carried by the bearing is 8330 N. If the length of the journal is 70 mm. what is type of bearing?

Question 4

A full journal bearing having diametral clearance to diameter ratio of using a lubricant with viscosity (Z) of Pa-s, support the shaft journal running at N = 2400 rpm. If bearing pressure is 1.4 MPA. The Sommerfeld number is ____.

Question 5

For ball bearings, the fatigue life L measured in number of revolutions and the radial load F are related by , where K is a constant. It withstands a radial load or 2 kN for a life of 540 million revolutions. The load (in kN) for a life of one million revolutions is _______

Question 6

A hydrodynamic journal bearing is subject to 2000 N load at a rotational speed of 2000 rpm. Both bearing bore diameter and length are 40 mm. If radial clearance is Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image128.png and bearing is lubricated with an oil having viscosity 0.03 Pa.s, the Sommerfeld number of the bearing is ______
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