The resultant axial load on a bolt depends upon
1. external load applied
2. initial tension due to tightening of bolt
3. relative elastic yielding of the bolt and connected member
Which of the above statements are correct?
where, P = resultant load
P1 = initial tension due to tightening of bolt
P2 = external load
m, b = relative elatsic yielding (m/N)
A bolt is to be used for making a fluid tight joint steam engine cover plates. Which of the following relation is used for initial tension (in N) in the bolt?
where d is the nominal bolt diameter in mm.
The most important dimension in the design of nut is its
For standard coarse threads, the threads are equally strong in failure by shear and failure by tension, if the height of the nut is approximately 0.4 times of the nominal diameter of the bolt. The height of the standard hexagonal nut is 0.8 d. The threads of the bolt in the standard nut will not fail by shear. So, height of nut is. most important design dimension.
Select the incorrect statement:
The Acme threads are usually formed on the spindles of bench vices.
Identify the wrong statement:
A coupler or turnbuckle is used for connecting two members which are subjected to tensile loading and which require slight adjustment in length.
Which of the following locking devices has the widest application in automobile industry?
Castle nut is extensively on jobs subjected to sudden shocks and considerable vibration such as in automobile industry.
Two shafts are connected by means of a flange coupling to transmit torque of 25 N-m. The flanges of the coupling are fastened by four bolts of the same material at a radius of 30 mm. What is the size of bolts if the allowable shear stress for the botl material is 30 MPa?
The designation M 33 x 2 of a bolt means
For bolts of uniform strength, the shank diameter is made equal to
Bolt of uniform strength are made by
1. Reducing the diameter of shank of bolt corresponding to that of minor diameter.
2. Making a hole and making the area of shank equal to root area.
How can shock absorbing capacity of a bolt be increased
By reducing the shank diameter to the core diameter, the shank of the bolt will undergo a higher stress. This means that the shank will absorb a large portion of energy.