cameroon gce intermediate level refrigeration repairs 3

cameroon gce intermediate level refrigeration repairs 3

cameroon gce intermediate level refrigeration repairs 3

PART I: WRITTEN 45 mins / 9 marks
(This written part should be done at the same time by all candidates under Invigilation).
The candidate must answer 3/5 question.
1) Give and explain the function of the thermal relay in an electrical diagram. (3marks)
_______________________________________________________________________________________________
2) Explain with the help of a clamp, when you know that the refrigeration circuit is correctly charged. (3marks)
_______________________________________________________________________________________________
3) Cite the various types of connection used in electrical wiring in case of three phase motor.
(3marks)
_______________________________________________________________________________________________
4) During the servicing of a split system you observed that, the liquid line is frosting from the service valve to the
Evaporator, but the evaporator is not producing effectively. What is the explanation of the frost? Can you suggest
any solution?
(3 marks)
_______________________________________________________________________________________________
5) Explain how a dirty condenser can affect the refrigeration system. (3 marks)

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