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Q1— Section header —
1.1Choose a description from COLUMN B that matches a term in COLUMN A. Write only the letter (A E\next to the question number (1.1.1
1.1.5\in the ANSWER BOOK. COLUMN A COLUMN B
1.1.5Heat of condensation Latent heat of ice Heat of fusion Heat of vapori ation Heat of sublimation
1.2Complete the following sentence or sentences/paragraph or paragraphs by using the word or words in the list below and referring to the graph. Write only the missing word or words next to the question number (1.2.1
1.2.5\in the ANSWER BOOK latent heat; temperature stays the same; melting or fusion; potential energy sensible heat; liquid phase changes to vapor phase; sublimation; heat energy (11041583\ Copyright reserved
1.2.1he process tak ing place between line A and B (1\
1.2.2he process tak ing place between line B and C (2\
1.2.3he condition of the temperature between line A and B (1\
1.2.4he type of heat required to raise the temperature of the water between line B and C (1\
1.2.5he type of heat required to melt the ice between line A and B (1\
1.3State ONE basic thermal law of refrigeration. (3\
1.4Define each of the following
1.4.1Specific heat capacity
1.4.2Latent heat
1.4.320
Q2— Section header —
2.1State TWO laws of thermodynamics (4\
2.2Draw a labelled block diagram of a vapour compression system indicating each of the following: ompressor Condenser
2.3State between which TWO parts the following pipes are connected in a refrigeration system:
2.3.1Suction pipe
2.3.2Discharge pipe
2.3.3Liquid pipe
2.3.420
Q3— Section header —
3.1Draw a neat label ed sketch of shell and
3.2An cylinder compressor rotating at 20 revolutions per second has a bore of 80 mm and a stroke of 88 mm. It deliver
3.3Study the domestic refrigeration sketch in FIGURE and identify the indicated components by w rit
Q4— Section header —
4.1Explain each of the following terms:
4.1.1Operational control
4.1.2
4.2Identify the type of instruments below and state the purpose of each as used refrigeration systems. Write only the answer next to the question number (4.2.1
4.2.3
4.3.1xplain the purpose of a filter drier in a refrigeration system. (3\
Q4— Section header —
4.4.1What type of fan would you install in a large air conditioning plant? (1\
4.4.2State TWO reasons for
Q4— Section header —
Q5— Section header —
5.1Name TWO types of starting relays for fridge compressors. (2\
5.2Draw a neat label ed circuit diagram of a capacitor start capacitor run motor. (5\
5.3Calculate the capacitance if two capacitors of 15 and 30 are connected in series (3\ (11041583\
5.4The heat load of a refrigeration system is 30 KW. The enthalpy of the saturated vapour entering the compressor is 80,46 K J/Kg. After compression the enthalpy is 94 06 K J/Kg. The liquid entering the control valve has an enthalpy
5.4.1efrigerant effect
5.4.2Work done by compressor
5.4.3Coefficient of performance (COP\
5.4.4efrigerant mass flow rate
5.4.5Power required to drive compressor if efficiency of plant is 80 (5 2\ (10\ [20] TOTAL: 10020