AC/Refrigerator Paper 2 WASSCE (SC), 2019

Question 2

2a.

  1. State Dalton’s law of partial pressure.
  2.     
  3. Identify one type of refrigeration where Dalton’s law of partial pressure is applied.

b.    State one difference between the following:

(i)

absolute pressure

vacuum pressure

(ii)

sensible heat

latent hea

(iii)

dry-bulb temperature

wet-bulb temperature

 

c.    A compressor in a refrigerator is rated at 300W. How much electrical energy is used in 20 minutes?

 

Observation

Question 2c required candidates to calculate much electrical energy is used in 20 minutes for a refrigerated rated 300 W. The expected response is: