ISRO Mechanical Exam: Strength of Materials Quiz

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Question 1

A torsion bar with a spring constant ‘k’ is cut into ‘n’ equal lengths. The spring constant for each portion would be

• Ank
• B
• Ck/n
• D

Question 2

A circular shaft subjected to torsion undergoes a twist of 1 ° in a length of 120 cm. If the maximum shear stress induced is limited to 1000 kg/cm² and if modulus of rigidity G=0.8×10⁶ Kg/cm², then the radius of the shaft should be ___________.

• A/18 cm
• B/27 cm
• C18/cm
• D27/cm

Question 3

is the deflection under the load P of a cantilever beam (length L, modulus of elasticity E, moment of inertia I). The strain energy due to bending is _______.

• A
• B
• C
• D

Question 4

A tubular shaft, having an inner diameter of 30 mm and an outer diameter of 40 mm, is to be used to transmit 80 kW of power. The speed of rotation of the shaft so that the shear stress will not exceed 50 MPa is

• A29.6 rpm
• B3557.4 rpm
• C1778.7 rpm
• D59.2 rpm

Question 5

In case of a horizontal beam loaded under bending, the point of inflexion or contra flexure corresponds to a point on the beam, where

• AShear force is zero
• BBending moment changes its sign
• CShear force is maximum
• DNone of the above

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