Questões Militares Para engenharia
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Tipos de rebocadores: I) Combi. II) Pusher tug. III) Multi tug. IV) Tractor. V) Conventional.
Características: ( ) Tug with azimuth propellers forward which are built to operate over the tug’s bow.
( ) Tug with azimuth propellers aft and towing point forward, built to operate manly over the tug’s bow.
( ) Tug equipped with an additional towing point at the after end, and with 360° steerable bow thruster.
( ) Tug with azimuth propeller aft which are built to operate over the tug’s bow as well as over tug’s stern.
( ) Tug with their propulsion aft and towing point near midship.
( ) Tug with their towing point aft and propulsion forward of midship.
( ) Single screw tugs are usually best to some alongside for assistance of a submarine.
( ) An open fixed pitch propeller develops more thrust astern than an open controllable pitch propeller when fitted in a conventional tug going full astern.
( ) The nozzle type “backing nozzle”, has been developed to give better efficiency for a tug going astern, which results in a little less efficiency going ahead.
( ) Nozzles increase the efficiency of the propeller and increase the steering capabilities of a tug.
( ) The performance of a becker rudder when the tug has speed astern is better as that of an unflapped rudder.
A força de resistência observada por Sacramento é:
I) Residual. II) Proporcional ao volume de carena. III) Friccional. IV) Equivalente a 50% da resistência total do navio, quando em baixas velocidades.
Considerando as opções acima, assinale a alternativa correta: