Strength of Materials

111. If a rigid body is in equilibrium under the action of three forces, then

1. These forces are equal
2. The lines of action of these forces meet in a point
3. The lines of action of these forces are parallel
4. Both (B) and (C) above

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112. If a shaft is rotating N revolutions per minute with an applied torque T kg-m, the horse power being transmitted by the shaft, is

1. 2πNT/550
2. 2πNT/750
3. 2πNT/4500
4. 2πNT/55

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113. If a shaft is simultaneously subjected to a toque T and a bending moment M, the ratio of maximum bending stress and maximum shearing stress is

1. M/T
2. T/M
3. 2M/T
4. 2T/M

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114. If a solid shaft is subjected to a torque 'T' at its end such that maximum shear stress does not exceed f_s the diameter of the shaft will be

1. 16T/πf_s
2. √(16T/πf_s)
3. ∛(16T/πf_s)
4. None of these

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115. If a steel rod of 20 mm diameter and 5 metres long elongates by 2.275 mm when subjected to an axial pull of 3000 kg, the stress developed, is

1. 9.5541 kg/cm²
2. 95.541 kg/cm²
3. 955.41 kg/cm²
4. 9554.1 kg/cm²

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116. If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be

1. Maximum
2. Minimum
3. Zero
4. Infinity

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117. If a three hinged parabolic arch carries a uniformly distributed load on its entire span, every section of the arch resists.

1. Compressive force
2. Tensile force
3. Shear force
4. Bending moment

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118. If all the dimensions of a bar are increased in the proportion n : 1, the proportion with which the maximum stress produced in the prismatic bar by its own weight, will increase in the ratio

1. 1 : n
2. n : 1
3. 1 : (1/n)
4. 1 : √n

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119. If b is the width of a plate joined by diamond riveting of diameter d, the efficiency of the joint is given by

1. (b + d)/b
2. (b - d)/b
3. (d - b)/d
4. (b - d)/d

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120. If n is the ratio of internal and external diameters of a hollow shaft, the ratio of the weight of the hollow shaft and that of solid shaft of same strength, will be

1. (1 - n²)/(1 - n²)^½
2. (1 - n²)/(1 - n⁴)^⅔
3. (1 + n³)/(1 + n⁴)^½
4. (1 + n¹)/(1 + n⁴)^⅔

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