更多"If a hydraulic pump on a winch acci"的相关试题:
[单项选择]If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.
A. a check valve will close that prevents reverse circulation
B. a centrifugal counterweight counteracts the force of gravity
C. the electric pump motor cut out
D. the control lever will move to the stop position
[单项选择]
When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing
A. (1) only
B. (2) only
C. (1) and (2)
D. (1), (2) and (3)
[单项选择]
As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （）
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing
A. (1) only
B. (2) only
C. (1) and (2)
D. (1),(2)and(3)
[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]As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.
A. circular
B. elliptical
C. rectangular
D. hexagon
[单项选择]If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.
A. contaminated fluid
B. pitted thrust rings
C. worn pintle bearings
D. obstructed suctions passage
[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]Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.
A. neutral
B. end
C. opening
D. closure
[单项选择]If a hydraulic pump is overheating, the cause may be （）.
A. excessive internal leakage in the pump
B. low discharge pressure and fluid flow
C. excessive fluid level in the hydraulic reservoir
D. operation of the pump at 100% efficiency
[简答题]GIS开关储能电机运行时间超过多少秒时会发“Hydraulic pump fail（液压泵故障）”信号？
[单项选择]If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.
A. increased pump speed
B. excessive pump discharge pressure
C. too low of a tilting box angle
D. low pump speed
[单项选择]An anchor winch should be equipped with mechanical brakes capable of holding（）.
A. half the breaking strength of the mooring line
B. the full breaking strength of the mooring line
C. the maximum expected tension of the mooring line
D. 50% over the working tension of the mooring line
[单项选择]Winch gears must be maintained in proper alignment to prevent （）.
A. overheating of the lube oil
B. over-speeding of the motor
C. wear on the braking system
D. damage to the teeth
[单项选择]Which pump is the self-priming pump?（）
A. turbine
B. centrifugal
C. ejector
D. mixed flow
[单项选择]What’s wrong（）the winch?
A. for
B. with
C. to
D. on
[单项选择]We had the winch（）last year.
A. to overhaul
B. overhauling
C. overhauled
D. overhaul
[单项选择]When retrieving the survival craft，the winch operator should stop the winch and check（）.
A. that all personnel are seated in the craft
B. that the cable has not jumped any grooves on the drum
C. which way the wind is blowing
D. the hydraulic fluid level before lifting
[单项选择]In the cargo winch, spur reduction gearing transfers the motor drive to （）.
A. the toping light
B. the board brake
C. the fail-safe
D. the barrel shaft
