plumbing science

Question 1

unit of watts

Answer 1

w

Question 2

unit of joules

Answer 2

j

Question 3

unit voltage

Answer 3

v

Question 4

unit of current

Answer 4

i

Question 5

unit of resistance

Answer 5

r

Question 6

what is AC

Answer 6

alternating current

Question 7

what is DC

Answer 7

direct current

Question 8

what is watts the measure of

Answer 8

power

Question 9

what is joules the measure of

Answer 9

energy

Question 10

where does alternating current come from

Answer 10

mains

Question 11

where does direct current come from

Answer 11

batteries

Question 12

how to work out watts

Answer 12

amps x voltage

Question 13

how to work out voltage

Answer 13

current x resistance

Question 14

how to work out amps

Answer 14

watts / voltage

Question 15

equation for ohms law

Answer 15

current x voltage x resistance

Question 16

how to work out resistance

Answer 16

voltage / current

Question 17

symbol for DC

Answer 17

2 lines with one dotted

Question 18

how to work out volts

Answer 18

watts / amps

Question 19

what does the cathode eat away

Answer 19

the anode

Question 20

what is an MCB

Answer 20

mini circuit breaker

Question 21

what is an RCD

Answer 21

residual circuit breaker

Question 22

what is an RCBO

Answer 22

residual current breaker with overload

Question 23

what are MCB and fuses used for

Answer 23

to protect the circuit and appliance

Question 24

what does the consumer unit contain

Answer 24

all MCBs, residual current device, RCDs and main Isolater

Question 25

what is the basic principle behind Newtons first law of motion

Answer 25

an object will remain in motion unless acted upon by an external force

Question 26

in a mechanical engineering system, what does the term velocity refer to

Answer 26

speed of an object in a specific direction

Question 27

in a hydraulic system, pressure is generally measured in what unit

Answer 27

pascals

Question 28

what is the primary difference between force and pressure

Answer 28

force is measured in newtons pressure in pascals

Question 29

what material is commonly used for water pipes due to its durability and resistance to corrosion

Answer 29

copper

Question 30

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

Answer 30

Chemical to mechanical

Question 31

what role do fluids play in a hydraulic system

Answer 31

they transfer force through pressurised liquid

Question 32

why is stainless steel sometimes preferred over other metals for plumbing in areas prone to corrosion

Answer 32

it is highly resistant to rust and corrosion

Question 33

which metal is often used for fittings in plumbing systems because of its strength and ability to resist high temperatures

Answer 33

brass

Question 34

which property measures a materials resistance to being deformed

Answer 34

hardness

Question 35

the purpose of gears in a mechanical engineering system is to

Answer 35

increase or decrease speed or torque