Deck 12: Wind Turbines and Power Generation

Question 1

There is a point on the torque-speed curve called _______________ torque above which torque decreases as speed increases.

Answer 1

pull-out
breakdown

Question 2

Rotor speed below or above synchronous speed is called torque.

Answer 2

False

Question 3

Why are generators connected in parallel?

Answer 3

Generators are connected in parallel to supply more load current.

Question 4

The mechanical energy, torque, applied to the generator rotor is converted to ___________ energy and fed from the stator to the load.

Question 5

A wind farm is an interconnection of ________________.

Question 6

Reactive power is that power used by inductive and capacitive loads when current and voltage are out of phase.

Question 7

Write the equation for slip.

Question 8

A synchronous generator is run at synchronous speed, which means it must be driven by a prime mover at a variable RPM.

Question 9

Describe basic motor action.

Question 10

What are the three types of three-phase generators?

Question 11

Generator output _____________ is determined by two factors, the speed of the rotor and the number of stator poles.

Question 12

Three-phase induction motors and three-phase induction generators each work on the principle of a(n) ___________ magnetic field produced by the stator.

Question 13

What three factors determine generator output voltage?

Question 14

An induction motor becomes an induction generator when driven by a prime mover such as a wind turbine.

Question 15

A transmission grid is a network of power stations, transmission circuits, and substations.