Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
A. 85% magnesia cement and glass wool

B. Tar dolomite bricks followed by asbestos

C. Fireclay refractory followed by aluminium sheet

D. Cotton followed by aluminium foil

Be the first to comment if anything wrong with this mcq
Your comment successfully submitted!
It will automatically posted after review and approval by our staff member.