Тест по работе рулевого механизма (CES v5.0)

Test results

Your result: 50%
Right answers:
1

According to SOLAS, what special steering gear requirement must passenger ships meet, that not all other ships require?

Your answer is correct:

Each power unit, on its own, must be able to move the rudder from 35° on either side to 30° on the other side in not more, than 28 seconds.
2

According to SOLAS, what special steering gear requirement must tankers above 10 000 tonnes meet, that other ships do not require?

Correct answer:

There must be oil leak detection, and steering capability must be regained within 45 seconds following the loss of one power actuating system.

Your Answer:

There must be two or more identical power units.
3

According to SOLAS rules, the rudder should move from 35° one side to 30° on the other side in a maximum of 28 seconds for which one of the following:

Correct answer:

The main steering gear of all ships, other than those with special requirements, such as those with non-conventional steering arrangements.

Your Answer:

The main and auxiliary steering gear of all ships, other than those with special requirements, such as those with non-conventional steering arrangements.
4

According to the SOLAS rules, the steering gear should be capable of being recharged with hydraulic oil from a fixed storage tank. What is the main reason for this?

Your answer is correct:

To ensure, that the steering gear can be rapidly recharged with clean hydraulic oil in the event of a leak from the system.
5

According to the SOLAS rules, the rudder angle from mid-ships to Port and Starboard should be at least:

Your answer is correct:

35°.
6

According to the SOLAS rules, when must ships fitted with more, than one steering gear power unit have at least two of these units running?

Correct answer:

In all cases, in areas, where navigation demands special caution.

Your Answer:

In areas, where navigation demands special caution. unless the system is arranged to change over automatically within 45 seconds of a failure to either power unit.
7

For an electro-hydraulic steering gear, if the standby pump fails to start, following a failure of the running pump, which one of the following best describes the likely cause?

Your answer is correct:

The pump has not been set to standby or its power supply has been switched off.
8

For an electro-hydraulic steering gear, if there is a lot of movement of the wheel in hand steering mode before the steering gear responds, which one of the following best describes the likely causes?

Your answer is correct:

Air in the hydraulic control system.
9

If the rudder will not hold a helm angle in manual or non-follow up mode, which one of the following statements gives the most likely causes?

Correct answer:

A hydraulic fluid leak in the hydraulic control or power systems.

Your Answer:

Blockage of a directional valve.
10

If the ship suddenly doesn’t steer in the direction intended, but no steering gear alarms activate, what is the most likely cause?

Your answer is correct:

A failure in the remote rudder angle indication system.
11

If there are no alarms, but the ship stops responding correctly to helm orders, which one of the following best describes the likely causes?

Your answer is correct:

A failure in the remote rudder angle indication system.
12

In accordance with SOLAS, when must both steering gear power units be in use?

Your answer is correct:

In areas, where navigation demands special caution.
13

In the event of an oil leak on a steering gear fitted with an automatic change-over system, at what point should the system be automatically split into two?

Correct answer:

When a main low level alarm operates on either hydraulic oil tank.

Your Answer:

At the same time as one of the pumps is automatically stopped.
14

Requirements for steering gears are given in which one of the following publications?

Your answer is correct:

SOLAS.
15

Steering gear alarms can only be acknowledged from which one of the following?

Correct answer:

The wheel house.

Your Answer:

The duty engineer’s call alarm.
16

The force generated by a steering gear hydraulic system depends on:

Correct answer:

The hydraulic pressure and the area it acts on.

Your Answer:

The hydraulic pressure only.
17

The main purpose of emergency steering drills is to:

Correct answer:

Make sure, that enough of the ship’s crew are trained to carry out emergency steering.

Your Answer:

Make sure, that the engineers can perform emergency steering.
18

The ship is at sea and an order to switch over to local steering is given. What knowledge will you need in particular?

Your answer is correct:

What you have learnt during emergency steering drills, and the emergency operating procedures.
19

The steering mode in which the rudder angle is pre-set manually and kept in position automatically, is called:

Correct answer:

Follow up mode.

Your Answer:

Autopilot mode.
20

What is the main purpose of the safety valve on a hydraulic steering gear?

Correct answer:

To protect the actuator against too high an oil pressure.

Your Answer:

To regulate the return flow of oil from the steering gear.
21

What is the most likely cause of the hydraulic lock alarm occurring on a steering gear system?

Correct answer:

A failure in the control system, such as a directional valve sticking open.

Your Answer:

A failure of one of the hydraulic pumps.
22

What is the purpose of the rapson slide on a ram type steering gear?

Your answer is correct:

It converts the linear movement of the rams into rotation of the tiller.
23

What special requirement for steering gears is applied to any ship over 70 000 tonnes?

Correct answer:

The main steering gear must have two or more identical power units.

Your Answer:

One of the steering gear motors must be supplied from the emergency switchboard.
24

What types of valves are actuated in order to move the rudder, when local steering is being carried out?

Your answer is correct:

Directional valves.
25

When a heavy sea strikes the rudder, which one of these statements best describes what will happen?

Correct answer:

If the force is large enough, the hydraulic pressure in the steering gear will be high enough to operate the safety valve, and the rudder will move.

Your Answer:

The shape and lightweight design of the rudder means that wave forces have no effect.
26

When in emergency steering mode from the steering flat, how is movement of the steering gear usually created?

Your answer is correct:

Start at least one power unit and activate the direction valve.
27

Where a steering gear is fitted with oil leak detection, what would be the first alarm in the event of loss of oil?

Correct answer:

Low level alarm in the hydraulic fluid tank.

Your Answer:

Low level alarm in the hydraulic fluid tank together with stand by pump auto-start.
28

Where is steering gear is fitted with oil leak detection, in the event of loss of oil, what would happen before a second pump automatically started?

Correct answer:

The hydraulic system would need to be automatically split.

Your Answer:

The low level alarm would need to be acknowledge on the bridge.
29

Where a steering gear is fitted with oil leak detection, in the event of loss of oil, what would the first alarm be, and what would happen?

Your answer is correct:

The first low level alarm would be activated, but the pump or pumps, that had been running will continue to run.
30

Where are remote rudder angle indicators usually fitted?

Your answer is correct:

At the bridge steering console and on the bridge wings.
31

Where is the changeover to local steering carried out?

Correct answer:

The steering compartment.

Your Answer:

The engine control room or the bridge.
32

Which is the only one of the following NOT known to have, caused moisture to have contaminated the hydraulic oil, used for the steering gear?

Your answer is correct:

A leaking rudder stock gland.
33

Which is the only one of the following, that is NOT likely to cause overheating of a hydraulic steering gear?

Correct answer:

Leakage of hydraulic fluid.

Your Answer:

High ambient temperatures and blocked oil coolers.
34

Which of the following are disadvantages of using ram type steering gear, compared to rotary vane gear?

Correct answer:

The ram type needs a separate rudder carrier bearing.

Your Answer:

The ram type takes up less space, than the rotary vane type.
35

Which of the following statements best describes the importance of the purity of the hydraulic oil used in steering gear?

Your answer is correct:

Even small solid particles will cause wear, whilst moisture will cause corrosion.
36

Which one of the following is NOT caused by air in a steering gear hydraulic system?

Correct answer:

Rudder tends to return to mid-ships.

Your Answer:

Erratic movement of the rudder.
37

Which one of the following statements about steering gear is NOT correct?

Your answer is correct:

A main steering gear must be able to move the rudder from 30° on either side to 30° on the other side in less than 28 seconds.
38

Which one of the following statements best describes the actions, would you take if there is a leak of hydraulic fluid from a steering gear, which does not have an automatic change-over system?

Your answer is correct:

Isolate the leaking part of the steering gear by following the procedures on the emergency steering instructions.
39

Which one of the following statements best describes the arrangement of steering gear alarms?

Correct answer:

Steering gear alarms can only be acknowledged on the bridge, but are indicated elsewhere.

Your Answer:

Steering gear alarms are only indicated and acknowledged in the bridge.
40

Which one of the following statements best describes the check, carried out during emergency steering drills?

Correct answer:

All emergency arrangements must be tested including operation from the steering compartment and communication with the bridge.

Your Answer:

In addition to the checks carried out prior to leaving port, hand steering from the bridge must be tested.
41

Which one of the following statements gives one of the steering gear requirements for passenger ships?

Your answer is correct:

Each power unit must be capable of moving the rudder from 35° on either side to 30° on the other side in not more, than 28 seconds.
42

Which one of the following would NOT cause slow rudder movement?

Correct answer:

Air in the hydraulic control system.

Your Answer:

Damage to, or partial seizure of, the rudder post or carrier bearing.
43

Which one of the phrases given in the options most accurately completes the following statement? A leaking safety valve on a hydraulic steering system is most likely to cause, which one of the following:

Your answer is correct:

Slow rudder movement.
44

Which one of the phrases given in the options most accurately completes the following statement? According to the SOLAS rules, if a ship has more, than one rudder and can be maneuvred with only one rudder, then:

Correct answer:

Only one main steering gear needs to be fitted to each rudder.

Your Answer:

An additional main or auxiliary steering gear is only required on each rudder for passenger ships of over 70 000 tones.
45

Which one of the phrases given in the options most accurately completes the following statement? The safety valve on a steering gear hydraulic system is most likely to operate because:

Correct answer:

A heavy sea has hit the rudder.

Your Answer:

The output pressure from the hydraulic pumps is too high.
46

Which one of the phrases given in the options most accurately completes the following statement? The ships steering gear must normally be checked and tested by the ship’s crew:

Your answer is correct:

Within 12 hours before departure.
47

Which one of the situations described below may cause the need for local steering?

Your answer is correct:

If the bridge is put out of action.
48

Which one of these statements about rudder carrier bearings is true?

Your answer is correct:

A separate rudder carrier bearing is only required on ram type steering gears.
49

Which one of these statements about the force, developed by a hydraulic system is true?

Your answer is correct:

Force equals pressure times area.
50

Which one of these statements about types of steering gear is true?

Correct answer:

Higher pressures are needed for the ram type.

Your Answer:

The ram type takes up less space, than the rotary vane type.
51

Which one of these statements best describes the effect of using two steering gear hydraulic pumps instead of one?

Correct answer:

The speed of rudder movement is greatly increased.

Your Answer:

The speed of rudder movement and the force on the rudder are greatly increased.
52

Which part of the hydraulic circuit controls the movement of the rudder from port to starboard?

Your answer is correct:

The directional valve.
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