网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Compared to a constant pitch propeller, a controllable pitch propeller（）.
A
more efficiently uses available engine power
B
operates at a lower efficiency at a fixed speed
C
produces the same torque at lower engine power
D
develops its rated power at a lower speed
参考答案
参考解析
解析：
暂无解析
更多 “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” 相关考题
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.（）A对B错
考题
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）
考题
当正副驾驶的姿态、指示，即俯仰、翻滚、指示相差5度时（）。A、PITCH显示在PFD左侧，ROLL显示在PFD右侧B、只显示PITCH在PFD上C、只显示ROLL在PFD上D、PITCH显示在PFD右侧，ROLL显示在PFD左侧
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
判断题Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）A
对B
错
热门标签
最新试卷