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Mechanical Engineering Objective Questions { Strength of Materials }

107. A key is subjected to side pressure as well at shearing forces. These pressures are called
A.Bearing stresses
B.Fatigue stresses
C.Crushing stresses
D.Resultant stresses

108. In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
A.Increase key length
B.Increase key depth
C.Increase key width
D.Double all the dimensions

109. Shear stress induced in a shaft subjected to tension will be
A.Maximum at periphery and zero at centre
B.None of the above.
C.Uniform throughout
D.Average value in centre

110. In the design of pulley, key and shaft
A.All three are designed for same strength
B.Key is made weaker link
C.Pulley is made weaker
D.Shaft is made weaker

111. In above example 11.139, the outside diameter of bigger tube is
A.6.0 cm
B.7.0 cm
C.7.5 cm
D.6.4 cm

112. In above example 11.139, the length 1 is
A.5 cm
B.3 cm
C.2 cm
D.1 cm

113. Mohr's circle can be used to determine following stress on inclined surface
A.Principal stresses
B.All of the above.
C.Tangential stress
D.Maximum shear stress

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