AC/Refrigerator Paper 2 WASSCE (SC), 2019

Question 1

1a.  Define the following terms:

  1. work;
  2. power;
  3. energy.

 b.    Draw the pressure enthalpy diagram and show the following processes:

  1. compression;
  2. condensation;
  3. vapourization;
  4. expansion.

Observation

Question 1b required the candidates to draw the Pressure-Enthalpy diagram showing the various stages in refrigeration. The expected drawing is: