ENGINEERING KNOWLEDGE - GENERAL
STEERING 3413 The action necessary to transfer the steering control from the
wheelhouse to local control in order to use the steering gear room trick wheel, is to _____________.
3414 As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is ____________.
A. align the trick wheel to the rudder angle position A. in motion, providing a null input B. set the six-way control valve in the trick wheel position B. not in motion, thus providing a null input
C. open the power transfer switch before engaging the trick wheel C. in motion, providing an input to place the main pump on maximum stroke
D. always place the rudder in the midship position to engage the trick wheel
D. in motion, providing an input to place the main pump at null stroke
Ans: A Ans: D
3415 If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel's steering can be initially and best maintained by using the _____________.
3416 When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is
_____________.
A. trick wheel A. set for maximum torque
B. accumulator B. on the purge and vent stroke
C. standby pump C. in the neutral position
D. telemotor D. rotating backwards
Ans: C Ans: C
3417 When the helm demands a 20‚ right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?
3418 In an electro-hydraulic steering system, rudder movement is maintained in close synchronization with the steering wheel position by means of the _____________.
A. The six-way valve opens. A. trickwheel
B. The steering service pump motor is stopped. B. follow-up control C. The follow-up gear takes the pump off stroke. C. six-way valve D. The cylinder relief valves bypass oil to the suction side of the pump. D. Rapson slide
Ans: C Ans: B
3419 Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the rudder closely in step with the steering wheel?
3420 Your vessel is departing at 1800 hours on a voyage of more than 48 hours duration. Regulations require that the steering gear be examined and tested no earlier than ____________.
A. The follow-up gear A. 0600 hours
B. The rudder angle indicator B. 0900 hours
C. The synchronous electric transmitter C. 1200 hours
D. A rudder angle limit switch D. 1500 hours
Ans: A Ans: A
3421 The follow-up gear on an electro-hydraulic steering gear ____________.
3422 Which of the following statements concerning the operation of a single-acting hydraulic ram is correct?
A. relieves excessive fluid pressure. A. Hydraulic force is applied simultaneously in two directions against the ram by directional ports.
B. takes the pump off stroke when the desired rudder angle is attained.
B. The single-acting ram is both extended and retracted by means of hydraulic force.
C. allows for rudder movement faster than the movement of the ship's wheel.
C. The single-acting ram is not retracted by means of hydraulic force.
D. returns the rudder to amidships when the wheel is released. D. Hydraulic force applied to a single-acting ram results in a pulling motion.
Ans: B Ans: C
3423 Which of the following types of hydraulic pumps would be used in a steering system?
3424 When air becomes trapped in the hydraulic fluid of a steering system, the _____________.
A. Lobe A. rudder will respond sluggishly
B. Screw B. hydraulic rams will overspeed
C. Radial piston C. sight glass will show bubbles
D. Volute D. ram relief valves will lift
Ans: C Ans: A
3425 Air trapped in the hydraulic fluid of a steering system should be indicated by ____________.
3426 While inspecting the steering system at sea, you should check for _____________.
A. the pump overspeeding A. air bubbles in the sight glass
B. an improper rudder response B. any leaks in the system
C. bubbles in the sight glass C. overtravel in the rudder angle indicator
D. ram relief valves lifting D. lost motion in the rams
Ans: B Ans: B
3427 When the steering wheel is turned, oil is directed to the steering gear rams by _____________.
3428 The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to ___________.
A. modulating the oil flow with the six-way valve A. transmit the rudder angle to the bridge indicator
B. moving the automatic pressure differential valve B. prevent the control linkage from striking the stops when hard over
C. moving the receiving telemotor which regulates the two-way valve C. automatically purge all entrained air from the system
D. varying the eccentricity of a floating ring or angle of a tilting box D. send hydraulic signals to the receiving unit
Ans: D Ans: D
3429 A solenoid, direct-acting, three-position, spring-centered, directional control valve is used in a hydraulic system to control a linear actuator. With the actuator under load there is no movement.
However, when the load is removed the actuator can be cycl
3430 When the helm angle position is changed, the series ofcorresponding events of the steering gear will
include__________. I. length of time the steering gear pump remains on stroke is proportional to helm angle input II. system pressure being higher for
A. One or both of the centering springs has broken and the spool has jammed in the valve body.
A. I only
B. One or both of the solenoid coils has sustained an open. B. II only C. The pump coupling is damaged and the pump is unable to attain
its rated speed of rotation.
C. Both I and II
D. The pump coupling has sheared and the motor is overspeeding. D. Neither I nor II
Ans: C Ans: A
3431 On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from overtraveling the bridge signal?
3432 When the helm is turned on the navigation bridge, which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear?
A. Rudder angle indicator A. The pumps go to full stroke.
B. Follow-up gear B. The six-way valve aligns itself with the running pump.
C. Electric transmitter C. Both port and starboard cables are energized.
D. Rudder angle limit switch D. The synchronous receiver turns, duplicating the helm motion.
Ans: B Ans: D
3433 Air trapped in the hydraulic fluid of a steering system may be indicated by ____________.
3434 Most hydraulic steering gears are fitted with relief valves which _____________.
A. the steering pumps overspeeding A. function when the rudder is amidships
B. a jammed open relief valve B. relieve excess whip pressure from the hydraulic oil system
C. a constantly occurring improper rudder response C. protect the piping assembly from external rudder shock
D. excessive ram pressure D. relieve excessive telemotor pressure
Ans: C Ans: C
3435 In an electro-hydraulic steering system, rudder shock is limited by _____________.
3436 Rudder motion is prevented from exceeding the movement of the steering wheel by the _____________.
A. a differential gear A. return springs
B. return springs B. six-way valve
C. a hydraulic accumulator C. follow-up gear
D. relief valves D. differential gear
Ans: D Ans: C
3437 When the steering gear is in operation, you should ________. 3438 When the desired rudder angle is attained by a typical double ram electro-hydraulic steering gear, the ___________.
A. check hydraulic oil levels every hour A. ram relief valves bypass oil to stop rudder movement B. check the rams for overheating B. six-way valve shifts to the neutral flow position
C. check for excessive oil leakage from rams C. steering pump electric motor is de-energized by the transfer switch
D. drain water from telemotor cylinders each watch D. follow-up gear takes the hydraulic pump off stroke
Ans: C Ans: D
3439 If a severe leak develops in the electro-hydraulic steering gear, which of the listed conditions could result?
3440 A power failure in the hydraulic system of a compact type steering gear would cause the rudder to _____________.
A. Loss of vessel steering A. swing 35° right or left
B. Overheating of the gyrocompass B. remain locked in its last position
C. Jamming of the six-way valve C. move to the midship position automatically
D. Jamming of the follow-up device D. jam against the rudder emergency stops
Ans: A Ans: B
3441 Regulations require that an indicatinglight, located at the propulsion control station, beilluminated if there is an overload that would causeoverheating of the _________.
3442 A vertical shaft having a rudder attached to its lower end and having a yoke, quadrant, or tiller fitted to its upper portion by which it may be turned, is the _________________.
A. forced draft blower motor A. rudder frame
B. fuel pump motor B. rudder post
C. steering gear motor C. rudder stock
D. condensate pump motor D. stern post
Ans: C Ans: C
3443 Dual electro-hydraulic steering units usually operate _____________.
3444 Under normal operating conditions, the rudder is hydraulically locked unless _____________.
A. with both pumps on line at the same time A. the manual trick wheel is engaged for steering
B. with one pump on standby B. the variable stroke pump is off stroke
C. with the follow-up gear disconnected C. a rudder order is given by the control system
D. only when the rudder is moved amidships D. an electric power system failure occurs at the steering gear
Ans: B Ans: C
3445 When the helm angle position is changed, the series ofcorresponding events of the steering gear will
include__________. I. rate of steering gear ram movement will be proportional to amount of helm angle input II. degree of tilting plate (box) angle wi
3446 Regulations require that prior to departure on a three-day voyage, the steering gear, whistle, and communications system between the bridge and engine room must be tested prior to departure no earlier than _____.
3447 In an emergency, the electro-hydraulic steering units can be directly controlled by the _____________.
3448 Hydraulic pumps most commonly used in steering systems are of the ____________.
A. trick wheel A. lobe type
B. rapson slide B. screw type
C. follow-up gear C. axial piston type
D. receiver unit D. volute type
Ans: A Ans: C
3449 In an electro-hydraulic steering system, damage due to rudder shock is prevented by _____________.
3450 While inspecting the steering gear at sea, you should check for _____________.
A. buffer springs A. any leaks in the system
B. relief valves B. accuracy of the rudder angle indicator
C. oil flowing through the pumps C. movement of the trick wheel
D. dashpots D. position of the six-way valve
Ans: B Ans: A
3451 The purging of air from an electro-hydraulic steering gear unit is necessary when _____________.
3452 Air trapped in the hydraulic fluid of a steering system would be indicated by _____________.
A. changing over to hand pump operation A. an improper rudder response
B. engaging the trick wheel B. hammering noises in the equipment or transmission lines
C. the system has been filled with new oil C. popping or sputtering noises D. the rudder angle indicator does not match the helm position D. all the above
Ans: C Ans: D
3453 Regulations require hydraulic steering gear systems to be equipped with a means of steadying the rudder in an emergency. This may be accomplished with ____________.
3454 According to Regulations ,which of the following statements is correct regarding the steering apparatus requirements for a vessel over 75 metres in length?
A. a suitable arrangement of stop valves in the main piping A. Hydraulic structural rudder stops are mandatory.
B. a positive arrangement for stopping the rudder before the rudder stops are reached
B. On hydraulic type steering gears, a suitable arrangement of check valves in the main piping system may be considered as a means of steadying the rudder.
C. a suitable arrangement of block and tackle powered by winches C. A separate auxiliary means of steering is not required where the main gear is of the dual power hydraulic type, having two independent pumps and connections.
D. buffer arrangements to relieve the gear from shocks to the rudder D. All of the above.
Ans: A Ans: C
3455 Regulations make certain requirementsregarding overcurrent protection. Steering gear feeder circuits shall be protected only by _____________.
3456 Electric and electro-hydraulic steering gear motors are required by Regulations to be _____________.
A. a circuit breaker with instantaneous trip A. protected by a circuit breaker and a thermal overload device B. motor running overcurrent protection B. provided with a running motor overcurrent protection device
C. a nonrenewable link cartridge fuse C. served by a single two conductor cable
D. a renewable link cartridge fuse D. served by two feeder circuits
Ans: A Ans: D
3457 Of the equipment listed below, which equipment must be tested NOT more than 12 hours prior to getting underway from a port when the voyage is to be of 48 hours or greater duration?
3458 Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to ____________.
A. Steering gear A. allow an alternate main pump to start in the fully loaded condition
thus developing immediate full torque
B. Emergency generator B. prevent either main pump from being hydraulically motored when idle by cross pressure flow
C. All internal vessel power control communications and alarms C. prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over
pressurization of the system
D. All of the above D. all of the above
Ans: A Ans: B
3459 Which of the listed systems related to an engineer's signal alarm panel is required to be indicated by a continuously illuminated light while in operation?
3460 Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by
_____________.
A. Deaerating tank low level A. regulating the oil flow with the six-way valve
B. Shaft alley bilge high level B. moving the automatic differential valve
C. Port or starboard steering gear motor running C. moving the receiving telemotor which regulates the two-way valve
D. No. 1 diesel generator low lube oil pressure D. varying the angle of a tilting box or eccentricity of a floating ring
Ans: C Ans: D
3461 An AC synchronous transmission type remote steering control system consists of a ______________.
3462 The purpose of the six-way valve used in an electro-hydraulic steering system is to _____________.
A. transmitter at the steering station and a receiver at the steering engine
A. parallel rudder motion to the steering wheel
B. reversible motor at the steering station geared to the steering pumps
B. take the pump off stroke when desired rudder angle is attained
C. small induction motor on the bridge which controls the rudder through pulleys
C. redirect hydraulic fluid flow when changing over pumps
D. variable displacement hydraulic pump driven by a reversible DC motor
D. ensure positive contact between the Rapson slide and the rudder post
Ans: A Ans: C
3463 According to Regulations , a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?
3464 A power-driven auxiliary steering gear is required by Regulations to be capable of putting the rudder over from 15‚ on one side to 15‚
on the other side with the vessel running ahead. For a 20 knot vessel, this test must be carried out at a speed of ____
A. 6 knots A. 7 knots
B. 7 knots B. 10 knots
C. 9 knots C. 15 knots
D. 12 knots D. 20 knots
Ans: B Ans: B
3465 Regulations require that electric andelectro-hydraulic steering gear motors shall be _____________.
3466 Rudder position is shown on the bridge by the _____________.
A. served by two electric power feeder circuits A. rudder angle indicator B. provided with a motor running overcurrent protection device B. follow-up gear C. protected by a circuit breaker and a thermal overload device C. telemotor position
D. served by a single two conductor cable D. Rapson slide indicator
Ans: A Ans: A
3467 The follow-up gear on an electro-hydraulic steering gear _____________.
3468 In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in _____________.
A. relieves excessive fluid pressure A. the pump going to full stroke
B. takes the pump off stroke when the desired rudder angle is attained B. closing of the six-way valve
C. synchronizes wheel position with the rudder position C. driving the rams up against the stops
D. returns the rudder to midposition when the wheel is released D. a corresponding slowing or increasing of the pumped flow rate
Ans: B Ans: D
3469 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 rudder angle is different from the position of the helm.
Ans: D
HYDRAULICS AND DECK MACHINERY