city & guilds nvq diploma in plumbing - apply scientific principles
TRANSCRIPT
![Page 1: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/1.jpg)
Understand how to apply scientific principles within mechanical services engineering
Level 2 NVQ Diploma in Plumbing and Domestic Heating
![Page 2: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/2.jpg)
Which one of the following is the freezing point of water?
A. 0ºC.B. 32ºC.C. 75ºC.D. 100ºC.
![Page 3: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/3.jpg)
A change of state in water takes place at which of the following
temperatures?A. 25ºC.B. 50ºC.C. 75ºC.D. 100ºC.
![Page 4: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/4.jpg)
Water is at its maximum density at which one of the following
temperatures?A. 0ºC.B. 4ºC.C. 25 ºC.D. 52 ºC.
![Page 5: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/5.jpg)
What is the intensity of pressure acting on the inlet to the 15 mm tap
shown in the following diagram?
A. 5.88kPa.B. 19.18kPa.C. 39.24kPa.D. 88.29kPa.
![Page 6: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/6.jpg)
Which one of the following pipes of equal length will create the greatest
resistance to the flow of water? A. A 22mm pipe which reduces down to 15mm
for a quarter of its length.B. A 15mm pipe which contains 4 machine
bends.C. A 15mm pipe which contains 2 machine
bends and 2 elbows.D. A 15mm pipe which contains 4 elbows.
![Page 7: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/7.jpg)
Which one of the following will cause siphonage to occur from the upper container to the lower
container in the following diagram?
A.Suction pressure at point B.
B.Positive pressure at point B.
C.Suction pressure at point A.
D.Atmospheric pressure at points A and B.
![Page 8: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/8.jpg)
Which one of the following types of device is used to take temperature measurements of pipe surfaces when commissioning a central
heating system?
A.Cylinder thermostat.B.Room thermostat.C.Differential digital thermometer.D.Multi-meter.
![Page 9: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/9.jpg)
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?
A. 42000kJ.B. 50400kJ.C. 84000kJ.D. 96000kJ.
![Page 10: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/10.jpg)
Conduction occurs by
A. heat travelling in straight lines through airB. heat travelling through a solid materialC. heat transfer by a chemical reactionD. heat transfer by motion of a fluid.
![Page 11: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/11.jpg)
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?
A.Radiation.B.Conduction.C.Convection.D.Thermal relaying.
![Page 12: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/12.jpg)
Which one of the following materials is the best conductor of heat?
a) Copper.b) Lead.c) Low carbon steel.d) Iron.
![Page 13: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/13.jpg)
Which one of the following values reflects a neutral pH?
A. 1.B. 4.C. 7.D. 11.
![Page 14: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/14.jpg)
Lime-scale in hot water is caused by
A. soft waterB. temporarily hard waterC. permanently hard waterD. distilled water.
![Page 15: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/15.jpg)
The rate of electrolytic corrosion of metallic materials in a plumbing system is affected by which one of the
following?
A. The melting point of the metals.B. Their position in the electro-chemical series.C. The relative density of the metals.D. The rate of thermal expansion of the metals.
![Page 16: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/16.jpg)
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?
A. To reduce shrinkage of the material.
B. To prevent capillary action.
C. To allow thinner metal to be used.
D. To add insulation to the roof covering.
![Page 17: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/17.jpg)
Which one of the following is a ferrous metal?
A. Copper.B. Brass.C. Low carbon steel.D. Lead.
![Page 18: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/18.jpg)
Which one of the following identifies the coating that forms on the surface of sheet lead and
provides a protective coating?
A. Sulphate.B. Patina.C. Galina.D. Surface sheen.
![Page 19: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/19.jpg)
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?
A. 13mm.B. 27mm.C. 58mm.D. 107mm.
![Page 20: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/20.jpg)
The SI unit for measuring electrical current is
A. wattB. jouleC. ohmD. ampere.
![Page 21: City & guilds nvq diploma in plumbing - apply scientific principles](https://reader035.vdocuments.us/reader035/viewer/2022062303/555ba62bd8b42ab9568b5014/html5/thumbnails/21.jpg)
What is the typical size of fuse that will be required for an 1100 watt portable
appliance fed by a 240 volt supply?
A. 1 amp.B. 3 amp.C. 5 amp.D. 13 amp.