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mechanical theory 1 > Basic Systems > Flashcards

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

Define an open loop system

A

The working fluid is consumed e.g. fuel, domestic fresh water

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3
Q

Defined a closed loop system

A

The working fluid is reused e.g. lub oil system, fresh water cooling system

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4
Q

What is a header tank for?

A

Reservoir to top up a system

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5
Q

What is a service tank for?

A

Supply of clean, water free fuel

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6
Q

What is a drain tank for?

A

Collects oil returning from a system

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7
Q

What is a contents gauge for?

A

(clock/dial) how much fluid is in a tank

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8
Q

What is a gauge glass for?

A

Visual indication to tank level (push button to read)

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9
Q

What is a sounding tube for?

A

Used to measure depth of liquid in a tank (dip tape)

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10
Q

What is the purpose of a strainer?

A

To remove large coarse particles, usually metal plates with holes in

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11
Q

What does the type of pipework used depend on?

A

Service being supplied (fluid)

Operating temperatures and pressures

Other types of material used within the system

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12
Q

What is phosphor bronze used for?

A

High pressure salt water

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13
Q

What is copper used for?

A

Domestic fresh water

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14
Q

What is copper nickel used for?

A

Lub oil

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15
Q

What is brass used for?

A

Castings (valves, couplings, junctions, taps)

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16
Q

What is plastic used for?

A

Sewage/waste systems and pre wet

17
Q

What does the type of seal used depend on?

A

System pressure

The fluid being used

The temperatures involved

18
Q

Examples of gaskets?

A 
NAF 
Paper
Leather
Cork
Copper
Rubber
19
Q

What is a mechanical seal used on?

A

Rotating components such as pump shafts

20
Q

Keeler ring couplings are used on …

A

High pressure pipework connections

21
Q

Gland packing is…

A

Silicone, wool or wax depending on fluid type, pressure and temperature

22
Q

The purpose of a valve is…

A

To provide a method of controlling flow or pressure of a fluid (liquid or gas) or to provide a means of isolating (shutting off) various systems or components.

23
Q

Name types of valves

A

Globe valve
Gate valve
Flap valve
Saunders valve
Ball seated cock
Relief valve-prevents overpressurisation
Reducing valve-reduces pressure for part of a system
Non return valve-prevents reverse flow
Pressure control valve-maintains pressure at a set level, monitors the outlet pressure
ROV- remote operation valve - rod gearing or automated

24
Q

Define a positive placement pump

A

Less flow, increases pressure e.g. gearwheel pump, rotary pump

25
Q

Define a dynamic displacement pump

A

Large flow, low pressure e.g. centrifugal pump and axial pump

26
Q

With faster flow pressure ….

With slower flow pressure ….

A

Drops

Rises

27
Q

A motor converts ….. Energy into ……. ……. to drive a pump.

A

Electrical

Mechanical motion

28
Q

Describe how a bourdon tube works?

A

Tube extends as pressure increases moving a needle round a dial

29
Q

Describe how a manometer works?

A

U tube, pressure increase pushes liquid round the U bend

30
Q

Describe how a tachometer works?

A

Measures rotational speed

31
Q

Describe how a thermometer works?

A

Measures the temperature

32
Q

Name three types of thermometer?

A

Fixed brass
Standard pocket
Clock/dial face

33
Q

How does a thermometer pocket work?

A

A plug fitted to systems to screw in a fixed brass thermometer. Filled with oil to aid heat conduction.

34
Q

Define the purpose of a filter?

A

Filters remove small fine particles.

35
Q

Examples of a metallic filter include

A

Wire wool

Steel plates and gauze screens

36
Q

Absorbent filters include

A

Fabrics
Felt
Yarn
Paper

37
Q

An accumulator is used as ….

A

…Pulsation dampers, they store potential energy (pressure) and release it as required - bladder type and piston type are the most comment

mechanical theory 1 (2 decks)

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