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
Classification Based on Type of Welding  Fusion welding : These processes involve fusion of the base metal to complete the weld. Fusion welds generally  do  not  require  thea

a) Illustrate the important of Ergonomics in a manufacturing sector or in service sector in the context of productivity. b) What is the rol of "Forecasting" Plays in production

What is tracing error? Define how to track tracing error?

Flash Butt Welding The two pieces to be welded are pressed against each other by applying a pressure. To whatever finish the faces are machined, there will be some protuberance

Austempering: The component to be hardened is initialy austenised and after that quenched into a lead or salt bath held at just over the martensite transformation temperature


Writing of a Welding Procedure specification (WPS ) A typical working procedure specification is written with all the factors of production in mind. Both experience and latest t

For my senoir design project, I chose a scissor lift table. My issue is finding a a roller to fit my design with .1 in od, press fit on >5 in shaft that can support 125-150 lb/sh

Q. Use of High temperature material in Superheaters? Typically superheaters and reheaters provide service lives of approximately 15 years (i.e. half the expected service life o

teori heat transfer conduction