更多"Most hydraulic steering gears are f"的相关试题:
[单项选择]Dual electro-hydraulic steering units usually operate （）.
A. with both pumps on line at the same time
B. with one pump on standby
C. with the follow-up gear disconnected
D. only when the rudder is moved amidships
[单项选择]Steering gears can be arranged with hydraulic control equipment known as a （）, or with electrical control equipment.
A. telemeter
B. telemanometer
C. telemotor
D. telemometer
[单项选择]In an emergency，the electro-hydraulic steering units can be directly controlled by the（）.
A. trick wheel
B. rapson slide
C. follow-up gear
D. receiver unit
[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 gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）
A. the pump going to full stroke
B. closing of the six-way valve
C. driving the rams up against the stops
D. a corresponding slowing or increasing of the pumped flow rate
[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 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]On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）
A. Rudder angle indicator
B. Follow-up gear
C. Electric transmitter
D. Rudder angle limit switch
[单项选择]Hydraulic pumps most commonly used in steering systems are of the （）.
A. lobe type
B. screw type
C. axial piston type
D. volute type
[单项选择]Air trapped in the hydraulic fluid of a steering system should be indicated by （）.
A. the pump over-speeding
B. an improper rudder response
C. bubbles in the sight glass
D. ram relief valves lifting
[单项选择]Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）
A. jam in the most worn part of the cylinder when the rings expand
B. break in the most worn part of the cylinder when the rings expand
C. wear eccentrically on the side opposite the end gap
D. overheat and jam at the top center on the combustion stroke
[单项选择]In using reduction gears to obtain efficient propeller speeds, （）.
A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling
[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]Safety shackles are fitted with（）.
A. a threaded bolt
B. a round pin，with a cotter pin
C. a threaded bolt，locknuts，and cotter pins
D. round pins and locknuts
[单项选择]Preventer bars are fitted on lifeboat releasing hooks to prevent（）.
A. the falls from unhooking if the releasing gear is operated accidentally while the boat is being lowered
B. operation of the release lever until the boat is waterborne
C. the falls from rehooking after they have been released
D. accidental unhooking when the falls become slack
[单项选择]Improperly fitted piston rings in a diesel engine can cause（）
A. excessive lube oil consumption
B. lower than normal lube oil temperature
C. higher than normal exhaust back pressure
D. excessive crankshaft end play
