Question 2
What control measure should be taken when there is a leakage of refrigerant?; State three safety precautions to be observed in a workshop to avoid electric shock; Define matter; State Boyle's Charles law?
Observation
The expected response was:
CONTROL MEASURE TO BE TAKEN WHEN THERE IS LEAKAGE OF
REFRIGERANT.
- Ensure that the room is thoroughly ventilated
- Recover the refrigerant.
- Locate the point of leakage and rectify
(b) SAFETY PRECAUTIONS TO BE OBSERVED TO AVOID ELECTRICAL
SHOCK
(i) Wear safety apparel such as glove and boot.
(ii) Do not operate electrical machine unless you know how to stop it.
(iii) Do not touch electrical operated machine with wet hand.
- Always concentrate when working on electrical operated machine.
- Do not remove protective guide from the machine when working.
- Do not touch naked wire with bare hand.
(c) Matter is anything that has weight and occupies space.
(d) Boyle’s Law: States that the volume of a given mass of gas is inversely proportional to its absolute pressure provided the temperature remains constant.
Mathematical expression
P1 V1 = P2 V2
Majority of the candidates avoided this question and of the few that attempted only a candidate got it right.