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Mechanical Engineering Objective Questions { Machine Design }



99. When a close coiled helical spring is compressed, its wire is subjected to
A.Tension
B.Shear
C.Compression
D.All of the above

100. If a spring is cut down into two springs, the stiffness of cut springs will be
A.Half
B.Same
C.Double
D.Unpredictable

101. Belt slip may occur due to
A.Heavy load
B.Loose belt
C.Driving pulley too small
D.All of the above

102. Aircraft body is usually fabricated by
A.Welding
B.Precasting
C.Rivetting
D.Casting

103. If two springs are in parallel then their overall stiffness will be
A.Half
B.Same
C.Double
D.Unpredictable

104. In hydrodynamic 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

105. Anti-friction bearings are
A.Sleeve bearings
B.Thin lubricated bearings
C.Ball and roller bearings
D.None of the above

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