Previous Year Questions

a. Define the following terms: system, boundary, equilibrium, saturation temperature, and pure substance. (5 marks) b. Define the zeroth and the first law of th…

The water in a large lake is to be used to generate electricity by the installation of a hydraulic turbine-generator at a location where the depth of the water…

a. A mass of 5 kg of saturated water vapour at 100 kPa is heated at constant pressure until the temperature reaches 200 °C. Calculate the work done by the steam…

Complete this table for H₂O: array|c|c|c|c|c| T,\ C & P,\ kPa & h,\ kJ/kg & x & Phase description \\ & 200 & & 0.7 & \\ 140 & & 1800 & & \\ & 950 & & 0.0 & \\ 8…

a. Does the specific internal energy of superheated water at 250 °C decrease or increase with an increase in pressure? (1 mark) b. Separate the list P, V, ρ, T,…

A hydraulic piston/cylinder (Figure 1 in the original paper) has a cylinder diameter D = 0.1 m with a piston and rod mass of 25 kg. The rod has a diameter of 0.…

Fill out the following table for substance water: array|c|c|c|c|c| & P\ [kPa] & T\ [C] & v\ [m3/kg] & x \\ a. & 500 & & 0.20 & \\ b. & 1400 & 200 & & \\ array

Draw and explain a P-T diagram for a pure substance including all points, lines and regions.

Consider two tanks, A and B, connected by a valve (figure in the original paper). Each has a volume of 200 L, and tank A has R-134a at 25 °C, 10% liquid and 90%…