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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 water
B
angle that the propeller makes with the surface of the water
C
number of feet per revolution the propeller is designed to advance in still water without slip
D
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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更多 “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” 相关考题
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
考题
Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed ___.A.apparent slipB.true slipC.pitchD.propulsive efficiency
考题
A controllable pitch propeller on a diesel driven vessel eliminates the need forA.friction clutchesB.disconnect clutchesC.reversing gearsD.reduction gears
考题
Compared to a constant pitch propeller, a controllable pitch propellerA.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
_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angleA.An external mechanismB.An internal mechanismC.An interlock deviceD.A hunting gear system
考题
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
考题
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
考题
单选题One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.A
the extra weight required for the diesel reduction gearingB
a minimum speed for the engines that limits the minimum speed of the vesselC
the higher fuel consumption per SHPD
the low efficiency of the system when a controllable pitch propeller is used
考题
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
考题
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
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When ship navigating in rough sea, the first measure taken by the chief engineer to prevent the overload should be（）A
cleaning fuel oil, lubricating oil and seawater filterB
reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propellerC
using low sea chestD
closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments
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（） 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
考题
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
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For vessels with （）, the meaning of the order would include the combination of pitch and revolutions as indicated in ships orders.A
fixed pitch propellersB
uncontrollable pitch propellerC
constant pitch propellersD
variable pitch propellers
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
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
考题
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
考题
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
考题
单选题A propeller of 5~65m in diameter, having a mean pitch of 4~88m, turning at 72 rpm, at a speed of 11 knots (339~79m/min), will give （） of apparent slip.A
0~967B
0~033C
0~031D
0~969
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