Which of the following stresses are associated with tightening of nut on a bolt
1. Tensile stress due to stretching of bolt.
2. Bending stress due to bending of bolt.
3. Crushing and shear stresses in threads.
4. Torsional shear stress due to frictional resistance between the nut and bolt.
Select the correct answer using the codes given below:
(a) 1,2 and 4 (b) 1,2 an 3
(c) 2,3 and 4 (d) 1,3 and 4