On a construction site, the site supply voltage to portable power tools is normally, 110 V a.c. , 110 V d.c. , 240 V a.c. , 415 V a.c., What is this symbol for?, DC electricity, System circulator, Electrical resistance, AC electricity., A cartridge fuse rating is calculated using which of the following formulae?, Amps = Watts × Volts. , Volts = Watts × Amps. , Amps = Watts - Volts. , Amps = Watts ÷ Volts., Ohm's law calculations use which one of the following formulae? V = Volts; I = Amps; R = Resistance., V = I x R. , V = I + R. , I = R + V. , R = V x I., Which of the following pipes, each measuring 6m in length, will offer the greatest resistance to the flow of water?, 15mm pipe with four elbows, 15mm pipe with four machine bends, 22mm pipe, which reduces down to 15mm halfway along its length, 15mm pipe with two machine bends and two elbows., Conduction occurs by, Heat travelling in a straight line through the air, Heat travelling through or along a solid material, Heat travelling via a chemical reaction, Heat travelling via the motion of a fluid., Which of the following will cause siphonage to occur?, Suction at point C, Increase in pressure at point B, Suction at point A, Atmospheric pressure in the tube., With a downward pressure of 100kPa and a head of 10m, what would be the approximate pressure in bar?, 100 bar, 50 bar, 10 bar, 1 bar., What would the fuse size be for a domestic appliance that has a power rating of 3kW?, 13 amp, 10 amp, 5 amp, 3 amp., Which of the following values reflects the pH value for pure water?, 1, 4, 7, 11., The limescale build-up in systems is caused by, Soft water, Acidic water, Temporary hard water, Permanently hard water., This form of corrosion is generally caused, Flux left in the tube after flushing out, The inhibitor in the system being too strong, Position of the electrolytic series table, Bad manufacture., A change of state may occur when water is heated to, 250C, 500C, 750C, 100C., The SI unit for measuring electrical current is, Watt, Ampere, Joule, Ohm., Specific heat capacity is measured in, N/m2, 0C or 0K, KJ/Kg/0C, Amperes., What would an anti-capillary groove in a lead weathering stop?, Water being drawn into the building, Corrosion of the lead, The lead from sliding out of place, Expansion and contraction., What has a sinusoidal wave form?, DC electricity, AC electricity, Convection heat transfer, Conductive heat transfer., If a customer painted their central heating pipework, what would that protect it from?, Pitting, Electrolytic corrosion, Atmospheric corrosion, UV corrosion., On an incoming mains, which of the following would have the lowest pressure?, The cold water tap at the kitchen sink, The float-operated valve to the cold water storage cistern in the loft, The first floor basin cold tap, The downstairs WC float-operated valve., The build-up of limescale in a hot water system could be noticed by:, The hot water temperature being hotter, The hot water temperature being cooler, The hot water flow rate increasing, The hot water recovery time decreasing., The relationship between current, resistance and voltage is stated in:, Boyle’s law, Ohm’s law, Charge’s law, BS7671., Which one of the following is the freezing point of water?, 0ºC., 32ºC., 75ºC., 100ºC., Water is at its maximum density at which one of the following temperatures?, 0ºC., 4ºC., 25 ºC., 52 ºC., Conduction occurs by, heat travelling in straight lines through air, heat travelling through a solid material, heat transfer by a chemical reaction, heat transfer by motion of a fluid., Which method of heat transfer is shown in the following diagram by water being heated in the boiler, circulating through pipe A to the cylinder and returning to the boiler for re-heating by pipe B?, Radiation., Conduction., Convection., Thermal relaying., Which one of the following materials is the best conductor of heat?, Copper., Lead., Low carbon steel., Iron., The rate of electrolytic corrosion of metallic materials in a plumbing system is affected by which one of the following?, The melting point of the metals., Their position in the electro-chemical series., The relative density of the metals., The rate of thermal expansion of the metals., Which one of the following is a ferrous metal?, Copper., Brass., Low carbon steel., Lead., Which one of the following is a non-ferrous metal?, Copper., Cast iron, Low carbon steel., Carbon, Which one of the following identifies the coating that forms on the surface of sheet lead and provides a protective coating?, Sulphate., Patina., Galina., Surface sheen..

Scientific principles #4

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