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单选题
A variable pitch propeller is made （） a boss with separate blades mounted into it.
A
of
B
up of
C
from
D
out
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单选题A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）.A
When dead in the water，it is often difficult to find the neutral position and slight headway or sternway may resultB
When going directly from full ahead to full astern，there is complete steering controlC
When the vessel has headway and the propeller is in neutral，there is no effect on rudder controlD
When maneuvering in port，full ahead or astern power can usually be obtained without changing shaft RPM
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单选题Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.A
a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engineB
a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engineC
two medium-speed, turbocharged, four-stroke diesel enginesD
a variable-speed AC generator
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单选题The propeller is pushed on to the tubeshaft taper and made tight by（）A
a mechanical sealB
keyway and keyC
a nutD
shrinkage
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单选题Most often （） is attached to the engine-propeller shaft for efficient electric power generation.A
a variable-speed AC generatorB
a fixed-speed AC generatorC
an air blowerD
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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
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单选题（） is made of a boss with separated blades mounted into it.A
A variable pitch propellerB
A variable pitch nutC
A fixed pitch parallelD
A fixed pitch screw
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单选题The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）A
for FP, once fitted, the position of the blades can also be changed in operationB
for CP, once fitted, the position of the blades can also be changed in operationC
the CP type has a relatively smaller hub compared with the FP propellersD
the FP type has a relatively larger hub compared with the CP propellers
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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
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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
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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
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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
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单选题In using reduction gears to obtain efficient propeller speeds, （）.A
they must be located at the after end of the engineB
they can only be used with one engine at a timeC
they eliminate the need for controllable pitch propellersD
they are connected to the engine with a flexible coupling
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单选题It was 10 o' clock ______Jill arrived at the office, which made the boss annoyed.A
whenB
thatC
whichD
then
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单选题By which of the following means is force efficiently provided to vary the pitch of the blades on a modem controllable pitch propeller?（）A
HydraulicB
MechanicalC
PneumaticD
Electrical
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单选题When the propeller blades are integral with the hub, the propeller is called a （）.A
built up propellerB
solid propellerC
controllable pitch propellerD
suction back propeller
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单选题__________the same mistakes in the annual financial report again made his boss very angry.A
His having madeB
He having madeC
He had madeD
He has made
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