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Q1— Section header —
1.8\n the ANSWER BOOK. COLUMN A COLUMN B
1.8easure of the intensity of hotness Pr ocess of removing heat from a substance that result
Q2— Section header —
2.1Define the following terms:
2.1.1Gauge pressure
2.1.2Inductive load
2.1.3First law of thermodynamics (3 2\ (6\
2.2How much heat is needed to raise the temperature of 20, g of water by 10,6 C? (The specific heat capacity of water is 4,184 J/g
2.3What will the temperature change be if 947J of heat is added to 76, 4 g of a material with specific heat of 0,607 J/g C? (2\
2.4A refrigerant cylinder with a mass of 93 kg is lifted through a vertical height of 78 m by a light cable in 11 ss at a constant velocity. Calculate the following:
2.4.1Work done to lift the mass
2.4.2The power generated (2 2\ (4\ [15]15
Q3— Section header —
3.1Define the following terms:
3.1.1Single phase connection
3.1.2Three phase connection (2 2\ (4\
3.2Draw the symbols of each of the following electrical motors and three phase motors:
3.2.1Electric motor winding coil
3.2.2Electric motor with terminals
3.2.3DC electric motor
3.2.4Three phase electric motor (4 2\ (8\
3.3What is the difference between resistive and inductive loads? (4\
3.4Electricians must be well informed about the different types of wire ways that are available so that they can select the correct type for a specific installation. State the THREE basic types of wire ways and discuss
Q4— Section header —
4.1Name the THREE procedural steps in fault finding. (3\
4.2State the THREE consequences of dirt blocking a refrigeration plant evaporator. (3\
4.3
4.4Give ONE word or term for each of the following descriptions by choosing a word or term from the list below. Write only the word or term next to the question number (4.4.1
4.4.6\n the ANSWER BOOK. condenser; compressor evaporator expansion valve liquid vapour mixture
4.5ismantling the parts of refrigeration system, you notice that th e crankshaft bearings are worn.
4.4.4Compressor Expansion valve
4.4.1(6030053\ Copyright reserved Please turn over
4.6Why should refrigeration plant be ventilated? (2\
4.7Explain the operation of the defrost system on a domestic refrigeration system. (5\ [25]25
Q5— Section header —
5.1Give an appropriate name for each of the following refrigeration tools:
5.1.56030053 Copyright reserved
5.1.8
5.2What is the difference between isometric and oblique drawings? (4\
5.3It is important to use the correct refrigeration o il in refrigeration system. Explain the consequences of using the incorrect type of refrigeration oil in refrigeration system.
5.4A l aboratory analysis of refrigeration oil may be desired. Explain how you would obtain refrigeration oil from a refrigeration system. (4\
5.5Refrigeration compressor failure is a common problem in the refrigeration industry. Name SEVEN causes of refrigeration compressor failure in the refrigeration industry. (7\ [25]25
Q6— Section header —
5.1What is water treatment (2\
5.2Name any THREE common types of household water treatment systems. (3\ [5] TOTAL: 1005