A transformer in an electric circuit serves to （）

A、generate its own electrical power

B、transform electrical energy into mechanical energy

C、increase or decrease circuit voltage as required

D、convert AC current to DC current

While loading bulk oil, you notice oil on the water near the bargeWhich of the following actions should you carry out FIRST?（）

A、Search the vessel for leaks

B、Notify terminal superintendent

C、Stop loading

D、Notify the Coast Guard

Hydraulic pumps most commonly used in steering systems are of the （）.

A、lobe type

B、screw type

C、axial piston type

D、volute type

The （） returns the pump operating rod to mid position as soon as the helmsman stops turning the wheel.

A、hunting gear

B、cut-off level

C、servo-motor

D、swivel block

Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）

A、Transducer

B、Reducer

C、Transformer

D、Rectifier

If you must make an electricity connection in a poorly accessible spot, solder it and seal it against （）

A、metal

B、wood

C、water

D、plastic