更多"A power failure in the hydraulic sy"的相关试题:
[单项选择]In an elector-hydraulic steering system, rudder shock is limited by（）
A. a differential gear
B. return springs
C. a hydraulic accumulator
D. relief valves
[单项选择]In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.
A. trick-wheel
B. follow-up control
C. six-way valve
D. Rapson slide
[单项选择]In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.
A. better control capabilities
B. less maintenance and repair
C. fewer personnel needed during jacking
D. less preload needed
[单项选择]Overload protection on hydraulic system is provided by the use of （）.
A. stop valves
B. pressure relief valves
C. balance valves
D. regulating speed valves
[单项选择]Pressure in an operating hydraulic system is developed （）.
A. only by the pump as its primary function
B. by resistance to the fluid flow through the system
C. by the thermal input to the systems fluid
D. solely by the charge applied by the accumulators
[单项选择]Flexible hose under pressure in a hydraulic system will （）.
A. tend to twist about its long axis
B. expand in length and in diameter
C. contract in length and expand in diameter
D. flex at right angles to the applied pressure
[单项选择]Overheating of a hydraulic system may be a result of （）.
A. changing pump discharge pressure in response to normal load variations
B. a high oil level
C. incorrect fluid viscosity
D. continued slow re-circulation of the oil
[单项选择]Before doing any work on a hydraulic system equipped with accumulators, you should（）
A. drain the accumulators and purge with oxygen
B. bleed off all stored energy from the accumulators completely
C. charge the accumulators to prevent system energy loss
D. pump the hydraulic fluid into the accumulators to prevent fluid loss
[单项选择]Purging air from a hydraulic system is necessary when（）
A. adding small amounts of oil to the system
B. the system has been overheated
C. the system has been drained and then filled with new oil
D. the system has been idle for a long period of time
[单项选择]（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.
A. Overflow valve
B. Reducing valve
C. Balancing valve
D. Reducing valve or balancing valve
[单项选择]In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）
A. When the helm is at any angle other than amidships
B. When the six-way valve is opened
C. When the ram relief valves lift
D. When the redder angle is different from the position of the helm
[单项选择]In a hydraulic system, （） are used to protect the system from over pressure.
A. stop valves
B. check valves
C. safety valves
D. reducing valves
[单项选择]After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）
A. The relief valves in the system should be readjusted
B. The filters and strainers should be checked frequently
C. All system pressure should be readjusted
D. The system should be drained and renewed with a fluid of different operating characteristics
[单项选择]A variable displacement system of hydraulic drives consists of （）.
A. a variable displacement axial piston pump
B. a constant displacement axial piston pump
C. a reciprocating piston pump
D. a centrifugal pump
[单项选择]The transmission system transmitting power from the engine to the propeller is composed of shafts, bearings, and（）
A. propeller
B. flying wheel
C. main engine
D. crankshaft
[单项选择]As there was a power failure in the hospital, the doctor had to （）operation.
A. call for
B. call off
C. call on
D. cal lout
[单项选择]Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）
A. hoisting system only
B. hoisting system and luffing system
C. hoisting system and slew and slewing system
D. slewing system only
[单项选择]If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.
A. trick wheel
B. accumulator
C. standby pump
D. telemotor
[单项选择]Thoroughly conduct a background check on the company, （）as many phone calls and Internet searches as you can.
A. made
B. makes
C. making
D. make
