80) The distance by which the outer edge of the D-slide valve overlaps the steam port in a steam engine, is known as

81) When a ship travels in a sea, which of the effect is more dangerous

82) Cam used for low and moderate speed engines should move with

83) The piston rod of a steam engine is usually connected by the cross head by means of

84) The metacentric height of ocean going vessels is usually of the order of