Aux 1 Unit 8

Hydraulic Control Systems

With reference to hydraulic systems:
(a) state FOUR applications for a hydraulic system on board a vessel;(4)
(b) state the effects and possible causes of EACH of the following:
(i) air in the system;(2)
(ii) dirt and foreign particles in the system;(2)
(iii) separated water in the system.(2)

1.Quiz. Study Notes

Answer

With reference to hydraulic systems:
(a) state TWO functions of an accumulator;(2)
(b) describe, with the aid of a sketch, a gas charged diaphragm or bladder accumulator;(6)
(c) describe how the bladder is prevented from being extruded from the accumulator described in part (b).(2)

2.Quiz. Study Notes

Answer

With reference to hydraulic systems:
(a) state THREE possible contaminations;(3)
(b) state possible causes of the contaminations stated in part (a).(3)
(c) explain how the contaminants stated in part (a) are prevented from affecting the system.(4)

3.Quiz. Study Notes

Answer

With reference to water contamination of hydraulic systems:
(a) state possible sources of water:(2)
(b) explain the possible consequences; (5)
(c) describe the actions to be taken should it be suspected.(3)

4.Quiz. Study Notes

Answer

Outline the safety precautions which should be taken when carrying out repairs or maintenance on hydraulic systems.(10)

5.Quiz. Study Notes

Answer

With reference to the cleanliness of hydraulic systems on board an ocean going vessel:
(a) list FOUR contaminants;(4)
(b) describe the steps that should be taken to eliminate the contaminants listed in part(a).(6)

6.Quiz. Study Notes

Answer

With reference to a windlass that is hydraulically operated by a variable displacement motor, explain the effect of changing EACH of the following:
(a) the flow rate of hydraulic oil;(4)
(b) the displacement of the motor.(6)

7.Quiz. Study Notes

Answer

Describe, with the aid of sketches, TWO methods for controlling the speed of a hydraulic motor.(10)

8.Quiz. Study Notes

Answer