Movement of wire at the signal box, Mechanical Engineering

Movement of wire at the signal box:

The wire working on railway signal is 5mm in diameter and 300m long. If movement at the signal end is to be 25cm, make calculations for movement which should be given to the end of wire at the signal box. Assume that the pull of 2500N on wire and take modulus of elasticity for wire material as 2 × 105  N/mm2.

Sol.: Given data:

P = 2500N

D = 5 mm

L = 300m = 300 × 1000 mm

Dm  = 25cm

E = 2 × 105 N/mm2.

We know that, σ = P/A

σ = P/ ( Π /4 × D2)

σ = 2500/ ( Π /4 × 52)

σ = 127.32 N/mm2.

e =   σ/E = 127.32/2 × 105

e = 0.0006366

As  e =   δL/L

δL = e.L = 0.0006366 × 300 × 1000 = 190.98mm = 19.098 cm

Total movement which is required to be given at the signal box end = 25 + 19.098 = 44.098 cm .......ANS

Posted Date: 10/20/2012 8:04:52 AM | Location : United States

Related Discussions:- Movement of wire at the signal box, Assignment Help, Ask Question on Movement of wire at the signal box, Get Answer, Expert's Help, Movement of wire at the signal box Discussions

Write discussion on Movement of wire at the signal box
Your posts are moderated
Related Questions
Torsion of shaft

Explain about the pedestals as construction engineering. Introduction of pedestals enables the construction engineers to make up levels to supply larger bearing areas to the fo

Determine the maximum value of the coefficient of friction: A force of 200 N inclined at 60 o to the horizontal is applied to the block A weighing 400 N. find out whether blo

Calculate days of inventory: From the data provided in table 1 and 2, calculate days of inventory. Solution Average Inventory Investment = (Last year inventory + Curre

How can I approach regarding my assignment


Leakage flux : The flux that links the coil only partially passes through the core does not link the coil as the moving or rotating device is called leakage flux.

Transmission System: In a two-wheeler, the transmission system means the whole arrangement that transmits the power from the engine crankshaft to the rear wheel.

Find out the deflection: Find out the deflection (vertical) at a distance 'a' from the tip in Example Solution As in this case there is no load at the point where the

Q. Portable Gas Cylinders - Handling of Hazardous? Portable Gas Cylinders Portable gas cylinders are vulnerable to fire exposure when located in process areas. Depending on l