lifting screw meaning in Hindi

She was ideal for a cruiser & mdash; wooden-hulled and bark-rigged with two engines and a lifting screw propeller.
She was given a lifting screw in order to increase her efficiency under sail, the last Royal Navy warship to be so equipped.
The gun car was positioned over the pit, the wheels were locked and the platform was locked into position with gun mount and car's weight shifted from the trucks ( bogies ) directly to the ground by jacks and lifting screws.