Basic Systems Flashcards
What is a header tank?
Used to top up a system.
What is a service tank?
Used as a reservoir of clean, water free supply of fuel.
What is a drain/sump tank?
Used to collect oil returning from a system and acts as a reservoir.
What is an open loop system? (Plus example)
The working fluid is used up, e.g. fuel system.
What is a closed loop system? (Plus example)
The working fluid is reused, e.g. cooling system.
Define a system.
A system is a series of interconnecting pipes and components that will deliver a substance from one point to another.
Name the 2 major groups of pumps and their individual function(s).
- Positive displacement pump. This pump physically displaced and moves the fluid along, as the fluid is moving pressure increases.
- Dynamic displacement pump. This pump moves a fluid by using the energy from an impeller to accelerate the fluid.
What is the function of a strainer?
A strainer stops large particles from getting into a system.
What is the symbol for a strainer and a filter?
Strainer - Rectangle box with an S.
filter - Rectangle box with an F.
Give an example of a positive displacement pump.
Piston.
Give an example of a dynamic displacement pump.
Centrifugal.
How many litres is 1 ton?
1000l.
What is a sounding tube used for?
Used to measure fluid level in a system. (Like a dip stick)
What is copper pipe work used for?
Fresh water.
What is plastic pipe work used for?
Waste water.
What does dissimilar metals mean?
Not the same metal.
What is Copper Nickel pipe work used for?
Lubricating oil system.
What is Phosphor Bronze pipe work used for?
Saltwater.
What is Brass pipework used for?
Castings, junctions and taps.
State 4 things to consider when deciding pipework.
- Pressure.
- Temperature.
- Fluid.
- Other materials.
What is an alloy?
A blend of different metals to give desirable properties.
List 5 materials used in pipework.
- Phosphor bronze.
- Copper.
- Copper nickel.
- Brass.
- Plastic.
What do you test for on the lubricating oil system?
- Water. - can cause corrosion or rust.
2. Viscosity.
List the types of seals.
- Gasket.
List the types of valve. (8)
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.
State Bernoulli’s theorem/principle.
As the speed of a moving fluid increases, the pressure within the fluid decreases.
Define convergence and divergence.
Convergent - Wide to narrow.
flow up, pressure down.
Divergent - narrow to wide.
Flow down, pressure up.
State the function of a electrical motor. (give example)
Electrical motors convert electrical energy into mechanical motion. e.g. HPSWP (high pressure salt water pump)
List the system indicators. (5)
- Pressure/vacuum gauge.
- Tachometer.
- Thermometers.
- Flow meters.
- Voltage meters.
State two types of pressure gauge(s).
- Bourdon type.
2. Manometer.
State the three types of thermometers.
- Brass type.
- Standard pocket.
- Dial type.
State the function of a filter and give two types of them.
- Metallic.
- Absorbent.
Filters are used to remove small or fine particles from a system.
State the specific function of metallic and absorbent filters.
Metallic - Removes COURSER particles of contamination.
Absorbent - used to remover finer particles of contamination.
What materials can absorbent filters be made out of? (4)
- Paper.
- Felt.
- Cloth.
- Yarn.
How does a pressure control valve work?
Pressure control valves work by monitoring outlet pressure and opens and closes as required to remain at set system pressure.
List two types of accumulator.
- Bag/bladder type.
2. Piston type.
State the function of an accumulator.
A device in which potential energy is held under pressure. They can be used as a surge/pulsation dampener/absorber.
List all 6 valves required for the Basic Systems exam.
- Non return valve.
- Saunders/solenoid valve.
- Pressure relief valve.
- Pressure control valve.
- Closed valve.
- Open valve.
