If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor（）.

Pedestal cranes have limit switches to restrict movement of which function（s）（）.

Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom（）.

What is/are the advantage（s）of cranes over conventional cargo booms（）.

What does “evel-luffing” accomplish during crane operations（）.

The Master or person in charge of a ship shall ensure the crane record book shows the（）.

Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.

Official draft measurements should be（）by authorized persons，agreed by both parties involved.

How should you signal the crane operator to hoist（）.

Sudden starts or stops of the boom is likely to cause all of the following except（）.