單項選擇題If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.

A.control air system
B.forced draft air system
C.supply air system
D.ships service air system


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2.單項選擇題If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.

A.combustion control air system
B.supply air system
C.ships service air system
D.low pressure deck air system

3.單項選擇題The sensible heat of air is dependent upon the （）.

A.dry bulb temperature
B.wet bulb temperature
C.saturation temperature
D.water vapor superheat

4.單項選擇題Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）

A.The follow-up gear
B.The rudder angle indicator
C.The synchronous electric transmitter
D.A rudder angle limit switch

5.單項選擇題Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.

A.apparent slip
B.tree slip
C.pitch
D.propulsive efficiency