11) water in a pipeline is doubled, then the pressure drop will be how many time the original value.

12) The average cutting speed in machining mild steel by single point tool of HSS is

13) The shear stress in throat area of weld joint of length 'L' and weld legh 'h', subjected to parallel load 'P' is

14) In centrifugal casting method, which type of core is used

15) If the tight and slack side tensions in a flat belt running at 1 km/minute are 1500 N and 1000 N, the power transmitted is