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Health and Safety > Plumbing Science > Flashcards

Plumbing Science Flashcards

1
Q

What is the unit for resistance?

A

Ohms

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2
Q

What is the power in a domestic property?

A

230V or 240V

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3
Q

What is the unit for power in an appliance?

A

Watts

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4
Q

What is the unit for electromotive force?

A

Voltage

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5
Q

What are the names of the two triangles?

A

The power triangle and The Ohm’s law triangle

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6
Q

What is the unit of electrical energy?

A

Joules

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7
Q

What is the unit for current?

A

Amperes

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8
Q

In a domestic property, an appliance has a fuse size of 3 amp. What is the maximum
power rating of the appliance?

A

720w or 0.72kW

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9
Q

An appliance has a 5 amp fuse and needs 1.2kW of power. What is the voltage required?

A

240v

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10
Q

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

A

80 ohms

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11
Q

What is the fuse size for a domestic appliance which has 1,200 ohms resistance?

A

0.2 amp

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12
Q

What does DC stand for and where does it get it’s power from

A

Direct current - From batteries

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13
Q

What does AC stand for and where does it get it’s power from?

A

Alternating current - Mains

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14
Q

If an appliance had a fuse rated at 13 amp and the resistance was 32 ohms, what would the voltage be?

A

415v

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15
Q

What does Ohms law triangle show the relationship between?

A

Voltage, Current and Resistance

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16
Q

What does the power triangle show the relationship between?

A

Watts, Amps and Volts

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17
Q

An appliance needs 5 amp fuse and needs 1.2Kw of power. What is the voltage required?

A

240v

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18
Q

What is the system called containing an earth rod?

A

TT

19
Q

What is the system called where the neutral wire and the earth wire are connected to the same block?

A

TNC

20
Q

What is the system called where the earth cable is at a separate point?

A

TNS

21
Q

What is the role of a miniature circuit breaker (MCB)?

A

It protects one appliance or circuit and trips out if an overload is detected

22
Q

Where is the miniature circuit breaker found?

A

In the consumer unit

23
Q

Where is a residual circuit breaker found?

A

In modern consumer unit

24
Q

What voltage of tools should be used with plug in RCDs?

A

230v

25
Q

What is the role of an RCD?

A

Trip out if there is an earth fault

26
Q

Where is the residual circuit breaker with overload (RCBO) located?

A

Found in the consumer unit

27
Q

What is the purpose of gears in a mechanical engineering system?

A

Increase or decrease torque

28
Q

Which property measures a materials resistance to being deformed?

A

Hardness

29
Q

In MES, why is it important to understand the concept of torque?

A

It measures the force causing rotation

30
Q

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

A

Chemical to mechanical

31
Q

What role do fluids play in a hydraulic system?

A

They transfer force through pressurised liquid

32
Q

What is the primary difference between force and pressure?

A

Force is measured in Newtons whereas pressure is measured in pascals

33
Q

What material is commonly used for modern residential water supply pipes due to its resistance to corrosion and ease of installation?

A

PVC (Polyvinyl chloride)

34
Q

Why is stainless steel preferred over other metals for plumbing in areas prone to corrosion?

A

It is highly resistant to rust and corrosion

35
Q

Why is brass often used for fittings in plumbing?

A

Because of it’s strength and it’s ability to resist high temperatures

36
Q

In a hydraulic system, pressure is typically measured in which unit?

A

Pascals

37
Q

In a mechanical engineering system, what does the term ‘velocity’ refer to?

A

Speed of an object in a specific direction

38
Q

Which material is used for compression fittings in plumbing?

A

Brass

39
Q

What is the term for the ability of water to flow between narrow spaces?

A

Capillarity

40
Q

What is the main component in natural gas?

A

Methane

41
Q

How many pascals are equivalent to 1 bar of pressure?

A

100,000 Pa

42
Q

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

A

Hardness

43
Q
A

Health and Safety (2 decks)

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