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单选题
propeller（）
A
螺旋桨
B
叶桨
C
舵
D
叶轮
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Shippropulsionnormallyoccurswiththehelpofao,whichisthetermmostwidelyusedinEnglish,althoughthewordscrew'issometimesseeninteralliaincombinationssuchasatwin－screwpropulsionplant()
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考题
A thrust bearing is used with a propulsion diesel engine to ____.A.control axial movement of the crankshaftB.transmit engine thrust to the propeller shaftC.absorb vibrations in the propeller shaftingD.prevent propeller thrust from being transmitted to the hull
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Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A.apparent slipB.true slipC.pitchD.propulsive efficiency
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Kort nozzles are installed around the propellers of some vessels to ______.A.increase the thrust of the propellerB.protect the propeller from striking sawyersC.protect the propeller from striking barges towed on the hipD.protect the propeller from touching bottom in low water
考题
螺旋桨有四个桨叶。 （）A、The helm has four blades.B、The propeller has forty blades.C、The windlass has four blades.D、The propeller has four blades.
考题
单选题Releasing oil from the sea anchor of a survival craft may（）.A
keep the propeller from being fouledB
increase propeller speedC
help calm the waves in the vicinity of the craftD
increase the holding power of the sea anchor
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单选题Releasing oil from the sea anchor of a lifeboat may（）.A
keep the propeller from being fouledB
increase propeller speedC
help calm the waves in the vicinity of the craftD
increase the holding power of the sea anchor
考题
单选题On a single-screw vessel the stern frame（）.A
furnishes support to the rudder，propeller shaft，and transom frameB
provides foundations for after mooring winchesC
provides foundations for the main propulsion enginesD
transfers the driving force of the propeller to the hull
考题
单选题The circular steel structure installed around the propeller of a towboat is the（）.A
nozzleB
shroudC
strutD
hood
考题
单选题Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）.A
back current from the rudderB
greater pressure on the right or left side of the propeller，depending on rotationC
lower pressure on the right or left side of the propeller，depending on rotationD
torque from the velocity and angle at which the surrounding water impinges upon the propeller blades
考题
单选题A thrust bearing is used with a propulsion diesel engine to （）.A
control axial movement of the crankshaftB
transmit engine thrust to the propeller shaftC
absorb vibrations in the propeller shaftingD
prevent propeller thrust from being transmitted to the hul
考题
单选题Propeller公司计划生产一款新设计的高技术飞机推进器。Propeller公司预计只要工人获得经验，他们将使用更少的时间完成工作。基于前期经验，Propeller公司假定适用70%的学习曲线，预计了如下成本。（1单位：平均单位成本$20 000，总成本$20 000。2单位：平均单位成本14 000，总成本28 000。）假如Propeller公司生产8个推进器，总生产成本将是（ ）。A
$50 660B
$54 880C
$62 643D
$112 000
考题
单选题The propeller consists of a （）with several blades of helicoidal form attached to it.A
shaftB
bossC
wheelD
lever
考题
单选题Which characteristic is a disadvantage of a controllable- pitch propeller as compared to a fixed-pitch propeller? （）A
Slightly higher fuel consumptionB
Lack of directional control when backingC
Inefficient at high shaft RPMD
Some unusual handling characteristics
考题
单选题A propeller, in order to operate efficiently, must rotate at a relatively （） speed.A
highB
lowC
fastD
lowly
考题
单选题As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.A
advanceB
cavitationC
edgingD
slip
考题
单选题螺旋桨有四个桨叶。 （）A
The helm has four blades.B
The propeller has forty blades.C
The windlass has four blades.D
The propeller has four blades.
考题
单选题A variable pitch propeller is made （） a boss with separate blades mounted into it.A
ofB
up ofC
fromD
out
考题
单选题Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.A
apparent slipB
tree slipC
pitchD
propulsive efficiency
考题
单选题Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）A
must churn the oil in the sumpB
is connected to the propeller shaftC
is driven at the highest RPMD
compensates for alignment variations between the engine and pinion gear
考题
单选题Compared to a constant pitch propeller, a controllable pitch propeller（）.A
more efficiently uses available engine powerB
operates at a lower efficiency at a fixed speedC
produces the same torque at lower engine powerD
develops its rated power at a lower speed
考题
单选题The pitch ratio of a propeller is the mean pitch divided by （）.A
the propeller diameterB
the propeller radiusC
the pitch angleD
the length of helix
考题
单选题The pitch of a propeller is a measure of the（）.A
angle that the propeller makes with a free stream of waterB
angle that the propeller makes with the surface of the waterC
number of feet per revolution the propeller is designed to advance in still water without slipD
positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip
考题
单选题Kort nozzles are installed around the propellers of some vessels to（）.A
Increase the thrust of the propellerB
Protect the propeller from striking sawyersC
Prevent the propeller from striking barges towed on the shipD
Prevent the propeller from touching bottom in low water
考题
单选题Propeller running at （） are generally efficient.A
high speedsB
medium speedC
low speedsD
the same speed with the engine
考题
单选题“Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired, or at least patched up temporarily until the next stop” This sentence means that （）.A
Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the spotB
Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the next port of callC
Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired until the next stopD
Any leaks in piping, propeller shaft, machinery, tanks, will have to be at least patched up
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