更多"A variable pitch propeller is made "的相关试题:
[单项选择]Propeller pitch speed minus ship speed divided by the propeller pitch speed is termed （）.
A. apparent slip
B. tree slip
C. pitch
D. propulsive efficiency
[单项选择]The pitch ratio of a propeller is the mean pitch divided by （）.
A. the propeller diameter
B. the propeller radius
C. the pitch angle
D. the length of helix
[单项选择]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 operation
B. for CP, once fitted, the position of the blades can also be changed in operation
C. the CP type has a relatively smaller hub compared with the FP propellers
D. the FP type has a relatively larger hub compared with the CP propellers
[单项选择]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
[单项选择]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
[单项选择]（） is made of a boss with separated blades mounted into it.
A. A variable pitch propeller
B. A variable pitch nut
C. A fixed pitch parallel
D. A fixed pitch screw
[单项选择]Fishing gear fouled（）propeller.
A. we
B. me
C. I
D. my
[单项选择]Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or （）.
A. inside micrometer
B. feeler gauge
C. adjustable trammel
D. sighting device
[填空题]城铁列车中VVVF（Variable Voltage Variable Frequency）电源，主要用于交流电动机调速。为保证电动机转速在较宽的范围内连续可调，要求逆变器输出（）和（）都有较宽的调节范围。为保证电动机气隙磁通恒定以防止铁心饱和，还必须使逆变器输出电压和频率（）变化。逆变器需要有（）的响应速度，以使电动机获得良好的调速性能。为了为了使电动机有较高的运行效率，并且在低速下也能稳定运行，应尽量减少逆变器输出的（）含量。
[单项选择]When the propeller blades are integral with the hub, the propeller is called a （）.
A. built up propeller
B. solid propeller
C. controllable pitch propeller
D. suction back propeller
[单项选择]The propeller is pushed on to the tubeshaft taper and made tight by（）
A. a mechanical seal
B. keyway and key
C. a nut
D. shrinkage
[单项选择]Propeller running at （） are generally efficient.
A. high speeds
B. medium speed
C. low speeds
D. the same speed with the engine
[单项选择]When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.
A. ahead direction
B. astern direction
C. right-handed
D. left-handed
[单项选择]A right-handed propeller will cause the survival craft to（）.
A. walk the stern to starboard in reverse
B. walk the stern to port in reverse
C. run faster than a lefe-handed propeller
D. right itself if capsized
[单项选择]The propeller consists of a （）with several blades of helicoidal form attached to it.
A. shaft
B. boss
C. wheel
D. lever
[单项选择]On a vessel with a single propeller，transverse force has the most effect on the vessel when the engine is put（）.
A. full ahead
B. full astern
C. half ahead
D. slow astern
