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City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
City & guilds   nvq diploma in plumbing - apply scientific principles
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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 ?
    • Radiation.
    • Conduction.
    • Convection.
    • Thermal relaying.
  • 12. Which one of the following materials is the best conductor of heat?
    • Copper.
    • Lead.
    • 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.
    • Lead.
  • 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.

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