City & guilds nvq diploma in plumbing - apply scientific principles

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City & guilds nvq diploma in plumbing - apply scientific principles

  1. 1. Understand how to apply scientific principles within mechanical services engineering Level 2 NVQ Diploma in Plumbing and Domestic Heating
  2. 2. Which one of the following is the freezing point of water? <ul><li>0ºC. </li></ul><ul><li>32ºC. </li></ul><ul><li>75ºC. </li></ul><ul><li>100ºC. </li></ul>
  3. 3. A change of state in water takes place at which of the following temperatures? <ul><li>25ºC. </li></ul><ul><li>50ºC. </li></ul><ul><li>75ºC. </li></ul><ul><li>100ºC. </li></ul>
  4. 4. Water is at its maximum density at which one of the following temperatures? <ul><li>0ºC. </li></ul><ul><li>4ºC. </li></ul><ul><li>25 ºC. </li></ul><ul><li>52 ºC. </li></ul>
  5. 5. What is the intensity of pressure acting on the inlet to the 15 mm tap shown in the following diagram? <ul><li>5.88kPa. </li></ul><ul><li>19.18kPa. </li></ul><ul><li>39.24kPa. </li></ul><ul><li>88.29kPa. </li></ul>
  6. 6. Which one of the following pipes of equal length will create the greatest resistance to the flow of water?   <ul><li>A 22mm pipe which reduces down to 15mm for a quarter of its length. </li></ul><ul><li>A 15mm pipe which contains 4 machine bends. </li></ul><ul><li>A 15mm pipe which contains 2 machine bends and 2 elbows. </li></ul><ul><li>A 15mm pipe which contains 4 elbows. </li></ul>
  7. 7. Which one of the following will cause siphonage to occur from the upper container to the lower container in the following diagram? <ul><li>Suction pressure at point B. </li></ul><ul><li>Positive pressure at point B. </li></ul><ul><li>Suction pressure at point A. </li></ul><ul><li>Atmospheric pressure at points A and B. </li></ul>
  8. 8. Which one of the following types of device is used to take temperature measurements of pipe surfaces when commissioning a central heating system? <ul><li>Cylinder thermostat. </li></ul><ul><li>Room thermostat. </li></ul><ul><li>Differential digital thermometer. </li></ul><ul><li>Multi-meter. </li></ul>
  9. 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? <ul><li>42000kJ. </li></ul><ul><li>50400kJ. </li></ul><ul><li>84000kJ. </li></ul><ul><li>96000kJ. </li></ul>
  10. 10. Conduction occurs by <ul><li>heat travelling in straight lines through air </li></ul><ul><li>heat travelling through a solid material </li></ul><ul><li>heat transfer by a chemical reaction </li></ul><ul><li>heat transfer by motion of a fluid. </li></ul>
  11. 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 ? <ul><li>Radiation. </li></ul><ul><li>Conduction. </li></ul><ul><li>Convection. </li></ul><ul><li>Thermal relaying. </li></ul>
  12. 12. Which one of the following materials is the best conductor of heat? <ul><li>Copper. </li></ul><ul><li>Lead. </li></ul><ul><li>Low carbon steel. </li></ul><ul><li>Iron. </li></ul>
  13. 13. Which one of the following values reflects a neutral pH? <ul><li>1. </li></ul><ul><li>4. </li></ul><ul><li>7. </li></ul><ul><li>11. </li></ul>
  14. 14. Lime-scale in hot water is caused by <ul><li>soft water </li></ul><ul><li>temporarily hard water </li></ul><ul><li>permanently hard water </li></ul><ul><li>distilled water. </li></ul>
  15. 15. The rate of electrolytic corrosion of metallic materials in a plumbing system is affected by which one of the following? <ul><li>The melting point of the metals. </li></ul><ul><li>Their position in the electro-chemical series. </li></ul><ul><li>The relative density of the metals. </li></ul><ul><li>The rate of thermal expansion of the metals. </li></ul>
  16. 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?   <ul><li>To reduce shrinkage of the material. </li></ul><ul><li>To prevent capillary action. </li></ul><ul><li>To allow thinner metal to be used. </li></ul><ul><li>To add insulation to the roof covering. </li></ul>
  17. 17. Which one of the following is a ferrous metal? <ul><li>Copper. </li></ul><ul><li>Brass. </li></ul><ul><li>Low carbon steel. </li></ul><ul><li>Lead. </li></ul>
  18. 18. Which one of the following identifies the coating that forms on the surface of sheet lead and provides a protective coating? <ul><li>Sulphate. </li></ul><ul><li>Patina. </li></ul><ul><li>Galina. </li></ul><ul><li>Surface sheen. </li></ul>
  19. 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? <ul><li>13mm. </li></ul><ul><li>27mm. </li></ul><ul><li>58mm. </li></ul><ul><li>107mm. </li></ul>
  20. 20. The SI unit for measuring electrical current is <ul><li>watt </li></ul><ul><li>joule </li></ul><ul><li>ohm </li></ul><ul><li>ampere. </li></ul>
  21. 21. What is the typical size of fuse that will be required for an 1100 watt portable appliance fed by a 240 volt supply? <ul><li>1 amp. </li></ul><ul><li>3 amp. </li></ul><ul><li>5 amp. </li></ul><ul><li>13 amp. </li></ul>

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