Basic Systems

Question 1

What is a header tank?

Answer 1

Used to top up a system.

Question 2

What is a service tank?

Answer 2

Used as a reservoir of clean, water free supply of fuel.

Question 3

What is a drain/sump tank?

Answer 3

Used to collect oil returning from a system and acts as a reservoir.

Question 4

What is an open loop system? (Plus example)

Answer 4

The working fluid is used up, e.g. fuel system.

Question 5

What is a closed loop system? (Plus example)

Answer 5

The working fluid is reused, e.g. cooling system.

Question 6

Define a system.

Answer 6

A system is a series of interconnecting pipes and components that will deliver a substance from one point to another.

Question 7

Name the 2 major groups of pumps and their individual function(s).

Answer 7

1. Positive displacement pump. This pump physically displaced and moves the fluid along, as the fluid is moving pressure increases.
2. Dynamic displacement pump. This pump moves a fluid by using the energy from an impeller to accelerate the fluid.

Question 8

What is the function of a strainer?

Answer 8

A strainer stops large particles from getting into a system.

Question 9

What is the symbol for a strainer and a filter?

Answer 9

Strainer - Rectangle box with an S.

filter - Rectangle box with an F.

Question 10

Give an example of a positive displacement pump.

Answer 10

Piston.

Question 11

Give an example of a dynamic displacement pump.

Answer 11

Centrifugal.

Question 12

How many litres is 1 ton?

Answer 12

1000l.

Question 13

What is a sounding tube used for?

Answer 13

Used to measure fluid level in a system. (Like a dip stick)

Question 14

What is copper pipe work used for?

Answer 14

Fresh water.

Question 15

What is plastic pipe work used for?

Answer 15

Waste water.

Question 16

What does dissimilar metals mean?

Answer 16

Not the same metal.

Question 17

What is Copper Nickel pipe work used for?

Answer 17

Lubricating oil system.

Question 18

What is Phosphor Bronze pipe work used for?

Answer 18

Saltwater.

Question 19

What is Brass pipework used for?

Answer 19

Castings, junctions and taps.

Question 20

State 4 things to consider when deciding pipework.

Answer 20

1. Pressure.
2. Temperature.
3. Fluid.
4. Other materials.

Question 21

What is an alloy?

Answer 21

A blend of different metals to give desirable properties.

Question 22

List 5 materials used in pipework.

Answer 22

1. Phosphor bronze.
2. Copper.
3. Copper nickel.
4. Brass.
5. Plastic.

Question 23

What do you test for on the lubricating oil system?

Answer 23

1. Water. - can cause corrosion or rust.

2. Viscosity.

Question 24

List the types of seals.

Answer 24

1. Gasket.

Question 25

List the types of valve. (8)

Answer 25

``` Globe valve - screw down non return. Gate valve. Flap valve - non return. Saunders valve - electrically fitted ‘solenoid’. Ball seated cock. Relief valve. Reducing valve - reduces pressure of fluid going in to prevent over pressurisation. Non-Return Valve - prevents back-flow. ```

Question 26

State Bernoulli’s theorem/principle.

Answer 26

As the speed of a moving fluid increases, the pressure within the fluid decreases.

Question 27

Define convergence and divergence.

Answer 27

Convergent - Wide to narrow. flow up, pressure down. Divergent - narrow to wide. Flow down, pressure up.

Question 28

State the function of a electrical motor. (give example)

Answer 28

Electrical motors convert electrical energy into mechanical motion. e.g. HPSWP (high pressure salt water pump)

Question 29

List the system indicators. (5)

Answer 29

1. Pressure/vacuum gauge. 2. Tachometer. 3. Thermometers. 4. Flow meters. 5. Voltage meters.

Question 30

State two types of pressure gauge(s).

Answer 30

1. Bourdon type. | 2. Manometer.

Question 31

State the three types of thermometers.

Answer 31

1. Brass type. 2. Standard pocket. 3. Dial type.

Question 32

State the function of a filter and give two types of them.

Answer 32

1. Metallic. 2. Absorbent. Filters are used to remove small or fine particles from a system.

Question 33

State the specific function of metallic and absorbent filters.

Answer 33

Metallic - Removes COURSER particles of contamination. | Absorbent - used to remover finer particles of contamination.

Question 34

What materials can absorbent filters be made out of? (4)

Answer 34

1. Paper. 2. Felt. 3. Cloth. 4. Yarn.

Question 35

How does a pressure control valve work?

Answer 35

Pressure control valves work by monitoring outlet pressure and opens and closes as required to remain at set system pressure.

Question 36

List two types of accumulator.

Answer 36

1. Bag/bladder type. | 2. Piston type.

Question 37

State the function of an accumulator.

Answer 37

A device in which potential energy is held under pressure. They can be used as a surge/pulsation dampener/absorber.

Question 38

List all 6 valves required for the Basic Systems exam.

Answer 38

1. Non return valve. 2. Saunders/solenoid valve. 3. Pressure relief valve. 4. Pressure control valve. 5. Closed valve. 6. Open valve.