Electrical machines

Question 1

What’s the purpose of a fuse

Answer 1

Protect the circuit

Question 2

Before 2 generators can be connected in parallel, what conditions are required?

Answer 2

Same voltage
same phase sequence
same frequency
in phase

Question 3

What is reactive power?

Answer 3

Wasted power in a circuit that causes voltage and current to be out of phase

Question 4

How is initial excitation achieved?

Answer 4

There is a permeant magnet on the rotor

Question 5

What are the advantages of three phase generation?

Answer 5

Smaller, lighter and more efficient
Power losses are reduced
More efficient
Better performance

Question 6

What are the 3 stages if brushless AC generators?

Answer 6

-Pilot stage
-Main exciter
- Output stage

Question 7

What energy conversion occurs in generators?

Answer 7

Mechanical/Kinetic energy into electrical energy

Question 8

What calculation is used to find the RMS voltage?

Answer 8

0.707 x peak Voltage = RMS