This set of Railway Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Welding of Rail Joint”.
1. Which of the following is not correct regarding Gas Pressure Welding?
a) It is costlier than Flash butt welding
b) Heat is produced by combination of oxygen and acetylene gas
c) Welding happens by fusion of the melted metals
d) Stationary and mobile units are available for gas pressure welding
View Answer
Explanation: In gas pressure welding necessary heat is produced by combination of oxygen and acetylene gases. This method is cheaper than flash butt welding and the quality of welding is also good.
2. Scheron process is used in which of the following welding methods?
a) Gas welding
b) Flash butt welding
c) Metal arc welding
d) Thermit welding
View Answer
Explanation: A high voltage source is used for energising a metal electrode which is then brought near another metal object. Heat is generated causing the two ends to weld. This type of welding can be done by using Insert plate technique, Scheron process or enclosed space technique.
3. Which of the following are the components of the Thermit mixture?
a) Aluminium and steel
b) Aluminium and iron oxide
c) Magnesium and iron oxide
d) Silicon and Aluminium oxide
View Answer
Explanation: A mixture of iron oxide and finely divided aluminium is used to form the Thermit mixture. It is then ignited and heat is generated producing aluminium oxide and iron.
4. Because of the difficulty level of the Gas pressure welding method it has not been adopted on the Indian Railways.
a) True
b) False
View Answer
Explanation: The gas pressure welding method is simple but has not been adopted on large scale by the Indian Railways. The actual reason behind this is the irregularity in the availability of gas and limited output.
5. Which of the following is not true about Flash butt welding?
a) Electric resistance produces heat
b) It has two movable jaws
c) It is the standard method of welding on Indian Railways
d) The rail ends are moved to and fro
View Answer
Explanation: Heat is generated by electric resistance method in Flash butt welding. One jaw is stationary while the other one is movable and gap between the two rails can be adjusted.
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