In arc welding, eyes need to be protected against the tiny chips of metals and from the harmful radiation of either UV or IR radiations.
102) In arc welding, eyes need to be protected against
Answer is:
ultraviolet as well as infrared rays
Explanation:
Related RRB JE Mechanical Question Paper 2014 (Set-3) with Answer Key
Answer is:
prevent sparking during commutation
Explanation:
A carbon brush is a sliding contact used to transmit electrical current from a static to a rotating part in a motor or generator, and, as regards DC machines, ensuring a spark-free commutation.
Answer is:
Graphite
Explanation:
Lead pencils contain graphite (a form of carbon), not lead. In fact, contrary to what many people believe, lead pencils never were made with lead.
Answer is: