In TIG welding, thoriated tungsten electrodes are used, because it ____________________?
Correct answer: B. Has better electron emissivity
- A. Has higher current carrying capacity
- B. Has better electron emissivity
- C. Is stronger than ordinary tungsten
- D. Is easy to prepare
Explanation
Thorium oxide added to tungsten increases thermionic electron emission, allowing the electrode to emit electrons more readily and maintain the arc effectively. This is why thoriated tungsten is preferred over ordinary tungsten in TIG welding.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Plant Design and Economics
803 free Plant Design and Economics MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Plant Design and Economics questions
The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?
Which of the following metals is the most prone to work hardening ?
In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
'Amortization' in respect of financial obligation of a company means the_____________________?
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?