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Mechanical Engineering Objective Questions { Machine Design }



106. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
A.0.01 micron
B.0.1 micron
C.1 micron
D.10 microns

107. In hydro-static bearings
A.The oil film pressure is generated only by the rotation of the journal
B.The oil film is maintained by supplying oil under pressure
C.Do not require external supply of lubricant
D.Grease is used for lubrication

108. Oil in journal bearing should be applied at the point where load is
A.Nil or lightest
B.Maximum
C.Average
D.Any one of the above

109. The rated life of a bearing varies
A.Directly as load
B.Inversely as square of load
C.Inversely as cube of load
D.Inversely as fourth power of load

110. In oilness bearings
A.The oil film pressure is generated only by the rotation of the journal
B.The oil film is maintained by supplying oil under pressure
C.Do not require external supply of lubricant
D.Grease required to be applied after some intervals

111. In V-belt drive, belt touches
A.At bottom
B.At sides only
C.Both at bottom and sides
D.Could touch anywhere

112. Three different weights fall from a certain height under vacuum. They will take
A.Same time to reach earth
B.Times proportional to weight to reach earth
C.Times inversely proportional to weight to reach earth
D.Unpredictable

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