Exam Questions

Question 1

List all common hazards associated with our hydraulic system

Answer 1

-Fast moving machinery
-Quiet in operation
-High pressures meaning explosive hazard
-Fire hazard with mineral oils as pinhole leaks can cause oil mists

Question 2

List full safety features Incorporated in a hydraulic system to protect personnel from the above hazards

Answer 2

-Guards are fitted to moving machinery
-Emergency stop buttons
-Relief valves to protect from excess pressure
-Isolation valves to isolate parts for maintenance

Question 3

Who is responsible for tag out on a hydraulic system

Answer 3

A senior rate

Question 4

Describe the phrase quite in operation when describing hazards inherent in a hydraulic system

Answer 4

The actuator could be remote from the noisy pump

Question 5

In which book would you find the following information regarding?
-The service life of a flexible hose.
-Service life of accumulator separator bags
- types of hydraulic fluid filtration used in the RN.
-The checks to be carried out on o seals before installation.

Answer 5

BR2000(53)(2) and BR2000(53)(3)

Question 6

How much water contamination is permissible in an RN hydraulic system using om33?

Answer 6

500 parts per million

Question 7

What contaminant in a hydraulic system could cause vibration noise, heat and erratic operation

Answer 7

Air

Question 8

A visi cross test kit is used to detect which form of contamination

Answer 8

Water

Question 9

Particulate contamination in a hydraulic system will cause what effects

Answer 9

Erratic operation, wear, scoring, seizing, seal failure and blocked filters

Question 10

What size of particle is analyzed in samples taken from an RN hydraulic system?

Answer 10

15 microns or larger

Question 11

The new barrel of oil is to be used to replenish a hydraulic system. What must be done before the oil is transferred

Answer 11

Clean the new barrel before using to ensure it doesn’t contaminate as you don’t know the state of the barrel

Question 12

What would be the remedy for particulate contamination found in a hydraulic system?

Answer 12

-Drain the system flush and refill
- external or internal filters
- better quality control

Question 13

Name two places where records can be found of test procedures. Calibration dates in an RN pneumatic system

Answer 13

BR 2000 and BR 3000

Question 14

Contamination by oil in a pneumatic system could cause which effect

Answer 14

The dieseling effect which is compression causing ignition. The oil May react with oxygen causing explosions

Question 15

Why a drain valves fitted to air storage bottles

Answer 15

So they are not over pressurized and the pressure can be released

Question 16

Information on test pressures, date of next change, length, naval stores number etc. Relating to flexible hoses can be found in which document on board RN vessels

Answer 16

The hose register

Question 17

What simple way can high pressure pneumatic flexible hose be identified from hydraulic flexible hose

Answer 17

Pneumatic hoses have small pinholes to release excess pressure and prevent bulging

Question 18

What are side effects can be caused by charging an air bottle too quickly

Answer 18

Heat generation, expansion of air and bottle, incorrect air bottle pressure as the air contracts and excess condensation in the bottle.

Question 19

What is the function of a reducing valve

Answer 19

To reduce the pressure in the system

Question 20

Give two effects of opening a HP air valve too quickly

Answer 20

The possible explosive effect, possible burst