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GATE 2019: Machine Design Quiz 6

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Question 1

A Bearing was used for combined thrust and radial loads at high speed. If the bearing is operating at load of 2kN, has a life of 900 hrs. what will be the life of the bearing if the load is halved ?

Question 2

In thrust bearings, the load acts

Question 3

An oil ring bearing of a transmission shaft of 50 mm diameter in which journal rotates at 1450 rpm. The radial clearance and bearing pressure are 20 microns and 4 MPa. If sommerfield number is 0.1274, the viscosity of lubricant in centipoise is

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

A full journal bearing with a journal of 75 mm diameter and a bearing of 75 mm length is subjected to a radial load of 2500 N at 400 rev/sec. The lubricant is SAE 30 at 75 °C having a viscosity of 16.5 × 10-3 kg/ms. Radial clearance is 0.03 mm. Eccentricity of the bearing is 0.27. Find the minimum film thickness.

Question 6

A single row deep groove ball bearing is subjected to radial load of 1800 N and axial load of 1200 N. It has basic dynamic load rating = 42000 N 
[Take, Radial factor, X = 0.50, Thrust factor, Y = 1 , Rotation factor, V = 1]
Rated life of the bearing is ___________  x 10revolutions.
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