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plumbing > plumbing science > Flashcards

plumbing science Flashcards

1
Q

what is voltage?

A

The unit for electromotive

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2
Q

what is resistance?

A

The ohms is the unit of resistance which opposes the flow of current

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3
Q

what is watts?

A

Watt is the unit of power for an appliance

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4
Q

what is joules?

A

joules is the unit of electrical energy today it would measure in kilowatts an hour

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5
Q

If an appliance needs 3KW in a domestic property, what is the fuse size?

A

3000 divided by 230 = 13W

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6
Q

In a domestic property an appliance has a fuse size of 3amp. What is the voltage required?

A

3 X 230 = 690W

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7
Q

An appliance has as amp fuse and needs 1.2KW of power. What is the voltage required?

A

1200 divided by 5 = 240W

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8
Q

What does KW stand for?

A

The K stands for kilo which is 1000 and the W stands for Watt

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9
Q

What would be the resistance of a domestic appliance if the fuse size was 3amp?

A

240 divided by 3 = 80 ohms

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10
Q

What is the fuse for a domestic appliance which has 1200 ohms resistance?

A

240 divided by 1200=0.2

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11
Q

What does AC stand for?

A

Alternating current from mains

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12
Q

What does DC stand for?

A

Direct current from batteries

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13
Q

Why is a TNS circuit separate?

A

A TNS circuit is separate because they all come in at different points

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14
Q

Why is a TNC circuit combined?

A

A TNC circuit is combined because the earth wire is connected to the neutral wire

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15
Q

What is a TT circuit?

A

This is different compared to the others because your earth doesn’t connect the electricity supply

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16
Q

What is the brown wire?

A

Its a live wire

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17
Q

What is the blue wire?

A

Its returns any electrical supply left in the circuit

18
Q

What is the yellow and green wire?

A

When the circuit trips out it stop from any electric supply from getting out

19
Q

What is the basic principle behind Newtons first law of motion

A

The rate of change of velocity in constant

20
Q

In a hydraulic system pressure is generally measured in what unit?

A

Pascals

21
Q

What is the primary difference between force and pressure?

A

Force is measured in newtons and pressure is measured in pascals

22
Q

Which type of energy is conversion is commonly found in an internal combustion engine?

A

Chemical to Mechanical

23
Q

What role do fluids play in a hydraulic system?

A

They transfer force through the pressurised liquid

24
Q

Which property measures materials resistance to being formed?

A

Hardness

25
Q

Which plumbing material is preferred for waste, drain and vent pipping due to its durability and lightweight properties?

A

PVC (polyvinyl Chloride)

26
Q

In MES (mechanical engineering services) why is it crucial to understand the concept of torque?

A

It measures the causing rotation

27
Q

How many pascals are equivalent to 1 bar of pressure

A

100,000 pa

28
Q

Which property measures the resistance of a material to deformation or bending

A

Hardness

29
Q

What is the specific heat capacity of water

A

4.19 kJ/Kg degrees

30
Q

which is a ferrous metal

A

steel

31
Q

which plastic is used for underground cold water mains

A

MDPE

32
Q

What is the process of water changing directly from ice to water vapour

A

erosion corrosion

33
Q

Which scientific principle is used in plumbing to prevent backflow in water systems?

A

Atmospheric Pressure

34
Q

What is the main factor that affects water pressure in a plumbing system?

A

Height and gravity

35
Q

In a closed plumbing system, increasing the temperature of the water typically causes:

A

Increase in water pressure

36
Q

When water flows faster through a narrower section of pipe, which principle is demonstrated?

A

Bernoulli’s Principle

37
Q

What happens to water flow when the pipe diameter decreases, assuming all other factors are constant?

A

Flow rate decreases

38
Q

Why is it important to understand the concept of thermal expansion in plumbing?

A

To install pipes that can handle temperature changes

39
Q

In a gravity-fed system, which factor has the most direct impact on water pressure at an outlet?

A

Temperature of the water

40
Q

Which of the following best describes the function of a non-return valve in a plumbing system?

A

Allows water to flow in one direction only

41
Q

In a heating system, why is an expansion vessel important?

A

It compensates for the expansion of water when heated.

42
Q
A

plumbing (2 decks)

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