The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure?

A material capable of undergoing large permanent deformation, when subjected to tension is termed as________?

Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ________ percent?

Pick out the wrong statement?

A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will________?

Which of the following is not a manufactured fuel?