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Mech Theory 1 Basic systems and diesel engines > Mech theory 1 Basic systems > Flashcards

Mech theory 1 Basic systems Flashcards

1
Q

Define a system.

A

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

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2
Q

What is an open loop system?

A

An open loop system is where the working fluid is consumed.

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3
Q

What is a closed loop system?

A

In a closed loop system the working fluid is re-used.

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4
Q

Name all 3 Tanks used in the RN.

A
  1. Header
  2. Service.
  3. Drain
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5
Q

Define a header tank.

A

A reservoir used to top up a system.

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6
Q

Define a service tank.

A

A reservoir or supply of clean, water free fuel.

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7
Q

Define a drain tank.

A

Collects oil returning from the system.

oil sump

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8
Q

Name the 3 gauges used within the RN.

A
  1. Contents gauge
  2. Gauge glass
  3. Sounding tube.
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9
Q

Name the equipment used in conjunction with the sounding tube and define them.

A

A conversion chart is used to convert height of liquid in feet and inches into tonnes.
A dip tape is a weighted tape measure dropped down the sounding tube and is read in feet and inches.

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10
Q

What is the purpose of a contents gauge?

A

The purpose of a contents gauge is to give a visual indication of how much liquid remains in a tank.

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11
Q

What is the purpose of a sounding tube?

A

It is used to measure the depth of a liquid in a tank.

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12
Q

What is the purpose of a gauge glass?

A

It gives a visual indication of how much liquid remains in a tank. a valve must be opened to update the reading (typically a push button valve)

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13
Q

What is a strainer?

A

Metal plates with holes in them. they allow the substance through but capture large coarse particles.

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14
Q

What factors determine the material used in pipework?

A
  1. The service being supplied
  2. Temperature
  3. Other materials used in the system.
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15
Q

What materials are used within the RN to make pipes?

A
  1. Phosphor bronze
  2. Copper
  3. Copper nickel
  4. Plastic
  5. Brass
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16
Q

What material is used for the pipework within the HPSW system?

A

A. Phosphor bronze

17
Q

What material is used for pipework within the fresh water system?

18
Q

What material is used for the pipework in the lub oil system?

A

A Copper nickel

19
Q

What material is used to make castings?

20
Q

What material is used to make the pipework within the sewage/waste water system?

A

A. Plastic

21
Q

What factors determine the type of seal that is used in a system?

A
  1. Pressure
  2. The working fluid
  3. Temperature.
22
Q

Name the 4 types of seals used in the RN

A
  1. Gaskets
  2. Mechanical seals
  3. Keeler ring couplings
  4. Gland packing
23
Q

Name the materials that a gasket can be made of.

A
  1. Rubber
  2. Paper
  3. Leather
  4. Non asbestos fibre (NAF)
  5. Cork
24
Q

What is the purpose of a gasket?

A

A. To create a water, air and gas tight seal.

25
Q

What is the purpose of a mechanical seal?

A

A. A mechanical seal is used to surround a fast moving component within a system such as a pump shaft.

26
Q

What is the purpose of a keeler ring coupling?

A

A. Used on high pressure pipework connections.

27
Q

Name the materials gland packing can be made of?

A

A. Silicone, wool, wax.

28
Q

Name all 10 valves.

A
  1. Globe valve
  2. Gate valve
  3. Flap valve
  4. Saunders valve
  5. Ball seated cock
  6. Pressure Relief valve
  7. Reducing valve
  8. Non return valve
  9. Pressure control valve
  10. Remote operation valve.
29
Q

What is the purpose of a pressure relief valve?

A

A. It protects the system from over pressurisation.

30
Q

What is the purpose of a reducing valve?

A

A. It reduces pressure for part of a system.

31
Q

What is the purpose of a non-return valve?

A

A. Any pressure or flow in the wrong direction will seal the valve preventing reverse flow.

32
Q

what is the purpose of a pressure control valve?

A

A. Maintains pressure at a set level and monitors the outlet pressure.

33
Q

what is the purpose of a Remote operated valve?

A

A. It is used to isolate a system from a remote location using rod gearing.

34
Q

Name the 2 types of pump used in the RN.

A
  1. Positive displacement

2. Dynamic displacement.

35
Q

What is a thermometer pocket?

A

A plug screwed into a system that fits a fixed brass thermometer filled with oil to aid conduction.

36
Q

What are the 3 types of thermometer?

A
  1. Standard pocket
  2. fixed brass
  3. clock dial
37
Q

What are the 2 types of accumulators?

A
  1. Bladder

2. Piston

38
Q

What is the purpose of an accumulator and which type of pump would it be used in conjunction with?

A

It’s purpose is to smooth out fluctuations and surges within a system. It would typically be used in conjunction with a positive displacement pump.

Mech Theory 1 Basic systems and diesel engines (3 decks)

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