243) In a partial journal bearing, the angle of contact of the bearing with the journal is

244) A shaft coupling should

245) In the levers of first type, the mechanical advantage is __________ one.

246) The load placed at the top of the screw in a mechanical screw jack is prevented from rotation by providing a swivelling mechanism.

247) The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)