更多"Attempts are made to eliminate axia"的相关试题:
[单项选择]In a fixed displacement axial piston hydraulic motor, the speed is varied by（）
A. regulating the ratio between torque and speed via the torque limiter at the motor
B. directing the motor output flow through a bypass line
C. maintaining a constant flow and pressure input
D. controlling the input flow rate
[单项选择]The engine is reversed by axial displacement of the camshafts In order for this to be carried out, the cams are （） with inclined transition faces.
A. lathed
B. shaped
C. shrunk
D. developed
[单项选择]The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the （）.
A. slide block
B. tilting box
C. pintle
D. reaction ring
[单项选择]A thrust bearing is used with a propulsion diesel engine to （）.
A. control axial movement of the crankshaft
B. transmit engine thrust to the propeller shaft
C. absorb vibrations in the propeller shafting
D. prevent propeller thrust from being transmitted to the hul
[单项选择]A thrust block is designed to（）.
A. transmit the thrust of the engine to the propeller
B. transmit the thrust of the propeller to the vessel
C. absorb the shock of wave pressure at the bow
D. be placed between the engines and the foundation to absorb the vibration
[单项选择]Special thrust devices are provided on ships to improve their （） at zero ship speed when the rudder is relatively ineffective.
A. brake capabilities
B. reversing capabilities
C. maneuvering capabilities
D. acceleration capabilities
[单项选择]In the relatively calm area near the hurricane center，the seas are（）.
A. moderate but easily navigated
B. calm
C. mountainous and confused
D. mountainous but fairly regular as far as direction is concerned
[单项选择]The delivery rate of an axial-piston hydraulic pump is controlled by varying the position of the （）.
A. sliding block
B. pintle
C. reaction ring
D. tilting box or swash plate
[单项选择]With reference to an axial piston pump, which one of the following statements is true?（）
A. The cylindrical barrel is coupled to the motor
B. The cylindrical barrel has an odd number of bores
C. The bores end in sockets
D. The sockets fit in the swash plate
[单项选择]An axial轴向 piston pump differs from a radial piston pump as the pistons of an axial piston pump are positioned （）.
A. radially from the shaft
B. parallel to each other and to the shaft
C. parallel to each other but at a right angle to the shaft
D. at an angle to each other and to the shaft
[单项选择]When the tilting box of a variable stroke axial-piston pump is perpendicular to the pump shaft, which of the following conditions will exist?（）
A. The pistons reciprocate
B. The ‘B’ end cylinder barrel rotates
C. There is no fluid flow
D. Power is transmitted hydraulically
[单项选择]An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.
A. cause loss of hydraulic oil from the system
B. result in extreme damage to the pump
C. cause damage to the pump ff not continually drained from the pump casing
D. result in the system high side pressure to substantially drop off
[单项选择]What is the function of the thrust bearing?（）
A. Prevents lateral movement of the slow speed gear
B. Transmits propeller thrust to the hull
C. Keeps spring bearings in line
D. Prevents main reduction gear axial movement
[单项选择]The thrust from the propeller to the hull of the ship is transferred by（）
A. tie rod
B. thrust block
C. bedplate of main engine
D. frame of main engine
[单项选择]（） thrust and resistance equal each other, the ship always travels at a constant speed.
A. As long as
B. As far as
C. As well as
D. Unless
[单项选择]With a given load on the cargo hook，the thrust on a cargo boom（）.
A. increases as the angle to the horizontal increases
B. increases as the angle to the horizontal decreases
C. is greatest at an angle of 45° and decreases as the boom is raised or lowered
D. is least at an angle of 45° and increases as the boom is raised or lowered
[单项选择]The order “Bow thrust stop” means “（）”.
A. Bow thrust full to pert
B. Bow thrust full to starboard
C. No bow thrust revolutions
D. No stern thrust revolutions
