1) The incoming water flow rate to a property has been confirmed at 8 litres/ minute, what is the reading in litres/ second? a) 0.15 litres/ second b) 0.13 litres/ second c) 0.2 litres/ second d) 0.08 litres/ second 2) What size over current protection device is most suitable to protect a circuit that has a 9kW electric shower installed on a 230volt supply? a) 16 amps b) 40 amps c) 32 amps d) 50 amps 3) What type of material allows the free movement of electrons? a) Good conductor b) Good insulator c) Good transformer d) Good resistor 4) What is meant by the DUCTILITY of a metal? a) It's ability to resist scratching b) It's ability to transfer heat c) It's used to manufacture ducts d) It's ability to bend / stretch without breaking 5) An over-current protection device of 5 A is installed on a 230 V supply. What is the maximum load allowed on the circuit? a) 115w b) 1.15kW c) 11.5kW d) 0.5w 6) What is the correct definition of the term ‘Direct Current’? a) A circuit that reverses its direction of travel intermittently through the circuit b) A current that reverses its direction of travel constantly through the circuit c) A circuit where the electrons always flow from the positive pole towards the negative d) A circuit where the electrons always flow from the negative pole towards the positive 7) A 3 m length of copper pipework is raised from 15 ºC to 60 ºC. Coefficient of linear expansion of copper is 0.000017 m/ m ºC. What length would the pipework increase by? a) 0.2295 mm b) 2.295 mm c) 0.459 mm d) 45.9 mm 8) What would cause a 10 year old PVCu guttering system to become brittle or weak? a) Degradation due to UV exposure from the Sun b) Deterioration of plastic from exposure to wind and rain c) Corrosion due to air pollution d) Conduction from a flue outlet 9) How many times does water expand by when it turns from a liquid to a gas? a) 16 times b) 160 times c) 1,600 times d) 16,000 times 10) Calculate the amount of energy required to heat 140 litres of water from 4 °C to 80 °C? Using specific heat capacity of 4.186 kJ/ kg °C. a) 44,539.04 kJ b) 46,883.2 kJ c) 4,166.4 kJ d) 45,768.02 kJ 11) What would be a sign that a brass fitting is subject to dezincification? a) A white powdery coating is visible on the surface of the fitting b) A pitting occurs on the surface of the fitting c) It becomes noisy when used d) The fitting becomes black and slimy 12) Which metal is known to be ferrous? a) Iron b) Lead c) Copper d) Tin 13) How is solder drawn into a copper fitting during the soldering process? a) Gravity attration b) Capillary action c) Dezincification d) Oxidisation 14) What are the two common types of electrical circuits? a) Series and Parallel b) Sequence and Parallel c) Combined and Series d) Sequence and Series 15) What is the minimum size of Main Earth Bonding a) 1mm2 b) 16mm2 c) 10mm2 d) 6mm2 16) What electrical safety device has an integral test feature? a) MCB (Miniature Circuit Breaker) b) RCD (Residual Current Device) c) Cartridge Fuse d) Fuse Wire 17) What type of heat transfer describes the circulation of warm air? a) Radiation b) Conduction c) Convection d) Reflection 18) At what temperature is water most dense a) 100 °C b) 10 °C c) 47.5 °C d) 4 °C 19) What alloy is made from combining Copper and Zinc? a) Brass b) Bronze c) Tin d) Steel 20) What term is used for the increase in length that a material expands by per °C rise in temperature? a) Coefficient of linear stretch b) Coefficient of linear expansion c) Coefficient of temperature d) Coefficient of length

E&SP Plumbing Quiz

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