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# City & guilds nvq diploma in plumbing - apply scientific principles

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• 1. Understand how to apply scientific principles within mechanical services engineering Level 2 NVQ Diploma in Plumbing and Domestic Heating
• 2. Which one of the following is the freezing point of water?
• 0ºC.
• 32ºC.
• 75ºC.
• 100ºC.
• 3. A change of state in water takes place at which of the following temperatures?
• 25ºC.
• 50ºC.
• 75ºC.
• 100ºC.
• 4. Water is at its maximum density at which one of the following temperatures?
• 0ºC.
• 4ºC.
• 25 ºC.
• 52 ºC.
• 5. What is the intensity of pressure acting on the inlet to the 15 mm tap shown in the following diagram?
• 5.88kPa.
• 19.18kPa.
• 39.24kPa.
• 88.29kPa.
• 6. Which one of the following pipes of equal length will create the greatest resistance to the flow of water?
• A 22mm pipe which reduces down to 15mm for a quarter of its length.
• A 15mm pipe which contains 4 machine bends.
• A 15mm pipe which contains 2 machine bends and 2 elbows.
• A 15mm pipe which contains 4 elbows.
• 7. Which one of the following will cause siphonage to occur from the upper container to the lower container in the following diagram?
• Suction pressure at point B.
• Positive pressure at point B.
• Suction pressure at point A.
• Atmospheric pressure at points A and B.
• 8. Which one of the following types of device is used to take temperature measurements of pipe surfaces when commissioning a central heating system?
• Cylinder thermostat.
• Room thermostat.
• Differential digital thermometer.
• Multi-meter.
• 9. What is the amount of heat energy required to raise 200 litres of water from 10ºC to 60ºC, if the specific heat capacity of water is 4.2 kJ/kg/ºC?
• 42000kJ.
• 50400kJ.
• 84000kJ.
• 96000kJ.
• 10. 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.
• 11. 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 ?
• Conduction.
• Convection.
• Thermal relaying.
• 12. Which one of the following materials is the best conductor of heat?
• Copper.
• Low carbon steel.
• Iron.
• 13. Which one of the following values reflects a neutral pH?
• 1.
• 4.
• 7.
• 11.
• 14. Lime-scale in hot water is caused by
• soft water
• temporarily hard water
• permanently hard water
• distilled water.
• 15. 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.
• 16. The following diagram shows a type of metallic roof joint which incorporates a gap in the joint design. What is the purpose of the gap?
• To reduce shrinkage of the material.
• To prevent capillary action.
• To allow thinner metal to be used.
• To add insulation to the roof covering.
• 17. Which one of the following is a ferrous metal?
• Copper.
• Brass.
• Low carbon steel.
• 18. 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.
• 19. By how much will a 10 metre length of gutter expand when heated from 15ºC to 30ºC, if the coefficient of linear expansion of plastic is 0.00018?
• 13mm.
• 27mm.
• 58mm.
• 107mm.
• 20. The SI unit for measuring electrical current is
• watt
• joule
• ohm
• ampere.
• 21. What is the typical size of fuse that will be required for an 1100 watt portable appliance fed by a 240 volt supply?
• 1 amp.
• 3 amp.
• 5 amp.
• 13 amp.