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ISRO Mechanical Exam: Machine Design Quiz

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Question 1

The block brake with 400 mm diameter is used to brake a torque 100 Nm as shown in the figure. If the coefficient friction is 0.25 at the brake surface what is the value of force F to be applied at the end of the lever.

Question 2

To ensure self locking in a screw jack it is essential that helix angle is _________.

Question 3

Which thread is more suited in power screw to take load on both directions?

Question 4

The failure occurs at a point in a member, when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in simple tension test, this is according to

Question 5

Which of the following stresses are associated with the tightening of a nut on a stud?

1) Tensile stresses due to stretching of stud.

2) Bending stresses of stud.

3) Transverse shear stresses across threads.

4) Torsional shear stresses in threads due to frictional resistance.

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