單項(xiàng)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(xiàng)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(xiàng)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(xiàng)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(xiàng)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

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The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().

題型:?jiǎn)雾?xiàng)選擇題

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().

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If the suction pressure at the refrigeration compressor is below normal, the cause can be().

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If the head pressure of a reciprocating refrigeration compressor is excessive, ().

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The major source of chemical contaminants in hydraulic fluid is ().

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The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?()

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Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().

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A pressure drop through the refrigerant liquid line may cause ().

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If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().

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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().

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