G101A - Mag Part 10,11 & 12

Select three of the following energy sources that are classified as "Prime Movers"

• Solar Panels

• Wind Turbine

• Water Turbine

• Diesel Engine

• Battery Bank

Identify the following DC generator circuits

• Separately excited DC generator

• Self-excited shunt DC generator

• Self-excited compound DC generator

  (short shunt)

• Self-excited compound DC generator (long shunt)

Identify the following DC generator circuits

• Separately excited DC generator

• Self-excited shunt DC generator

• Self-excited compound DC generator

  (short shunt)

• Self-excited compound DC generator (long shunt)

Identify the following DC generator circuits

• Separately excited DC generator

• Self-excited shunt DC generator

• Self-excited compound DC generator

  (short shunt)

• Self-excited compound DC generator (long shunt)

Identify the following DC generator circuits

• Separately excited DC generator

• Self-excited shunt DC generator

• Self-excited compound DC generator

  (short shunt)

• Self-excited compound DC generator (long shunt)

 Calculate the voltage generated (Eg) by the armature of a 4 pole lap wound shunt connected DC generator that contains a total of 150 effective conductors. The magnetic flux is 100mWb per pole and the speed of rotation is 1000 rpm

 $Eg\ =\ \frac{p\Phi nZ}{60a}$ 

 Calculate the terminal voltage (Vt) of a 4 pole wave wound self-excited shunt connected DC Generator with the following specifications:

- Generated voltage: 250 V

- Armature current: 50 A

- Shunt field resistance: 150  $\Omega$  

- Armature circuit resistance: 0.48  $\Omega$  

 $Eg\ =\ IaRa+Vt$ 

How many parallel paths are there in a wave wound armature?

If a DC generator is to produce a high current at a relatively low voltage, would it have a wave or lap wound armature?

• Wave

• Lap

In regards to the stator of a DC Generator. The frame, pole pieces and coils provide the magnetic field.

• True

• False