Answer to Question #223750 in Electrical Engineering for Zoleka

Question

Multiple Choo questions

Question 10 

Question 8 

The economic dispatch problem describes: 

(1) How the real power output of a controlled generating unit is selected to meet a 

given load and to minimize the total operating cost 

(2) How the reactive power output of a controlled generating unit is selected to meet 

a given load and to minimize the total operating cost 

(3) How the levels of power generation can be adjusted to maximise the total 

operating cost. 

(4) How power plants can be built economically. Question 7 

The regulator: 

(1) Supplies current to the rotor. 

(2) Converts ac to dc from voltage transformer. 

(3) Controls generator terminal voltages.

 

Answer 1

Question 8

How the levels of power generation can be adjusted to maximize the total operating cost. (Option 3 )

The economic dispatch problem is the setting of generating levels so that the overall cost of generation is as low as possible for a given load level. The cost of fuel per unit power output now fluctuates substantially with the unit's power output for thermal generating units.

Question 7

Controls generator terminal voltages (Option 3 )

The generator excitation system does this. The excitation system monitors the generator output and controls the magnetic field to keep the voltage correctly. As the load on the generator increases, so does the current flow, causing the voltage to fall.