单项选择题The water level in the gauge glass when a boiler is operating is （） when the boiler is shut down.

A.lower than
B.higher than
C.below
D.equal to

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1.单项选择题Large pipes or （） are fitted between the steam and water drums to ensure good natural circulation of water.

A.fire-tubes
B.furnaces
C.down-comers
D.soot-blowers

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2.单项选择题（） system is arranged to ensure that water can be drawn from any tank or the sea and discharged to any other tank or the sea as required to trim the vessel.

A.The domestic water
B.Bilge water
C.Oil transfer
D.The ballast

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3.单项选择题（） connected to the moving tiller will bring the floating lever pivot and the lever into line at right angles to the screw shaft axis.

A.A cut-off lever
B.A swivel block
C.A cross-head
D.A driving gear

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4.单项选择题Two rams of the hydraulic gear are linked at their outer ends to （） by a crosshead and swivel block.

A.the piston rod
B.the tiller arm
C.the connecting rod
D.the rudder

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5.单项选择题Excessively warm water leaving condenser may be caused by（）

A.fouled tubes in shell and tube condenser
B.too little or too warm condenser water
C.air or non-condensable gas in system
D.overcharge of refrigerant

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6.单项选择题（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A.The winch motor
B.The band brake
C.The winch barrel
D.The anchor capstan

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7.单项选择题（） unit is mounted so as to raise and lower the cable from the spurling pipe, which is at the top and center of the chain or cable locker.

A.The cable lifter
B.The hoisting motor
C.The topping wire
D.The life-raft

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8.单项选择题Topping wires fix the height of the derricks and （） to the deck may be used to prevent fore and aft movement.

A.stays
B.winches
C.barrels
D.brakes

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9.单项选择题Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.

A.fire-tubes
B.furnaces
C.water drums
D.water wall tubes

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10.单项选择题With reference to a rotary vane steering gear system, which one of the following statements is true?（）

A.The three moving vanes and the three fixed vanes form three pressure chambers
B.The three moving vanes and the three fixed vanes form six pressure chambers
C.The three moving vanes and the three fixed vanes form nine pressure chambers
D.The three moving vanes and the three fixed vanes form twelve pressure chambers

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最新试题

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

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A grease gun is generally used to lubricate a （）.

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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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The output volume of a positive fixed displacement pump can be changed only by （）.

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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

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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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If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.

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The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.

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Which of the following statements is correct concerning heat transfer?（）

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A salinity indicator is used to determine the （）.

题型：单项选择题