Generation B - 1

Geothermal power supplies 16% of New Zelanads Electricity requirements

• True

• False

New Zealand has relatively small-capacity reservoirs for Hydro dams.  With limited snow cover and low rainfall, how many days storage does NZ typically have available?

• 545 days

• 120 days

• 60 days

• 45 days

The ease at which the voltage can be transformed is one of the main advantages  of using A.C

• True

• False

AC current is generated using three phases. What is the phase shift in degrees between the phases?

• 90 degrees

• 45 degrees

• 120 degrees

• 180 degrees

Heat energy from burning gas or coal is used to change water to steam. What type of generation method does this describe?

• Geothermal

• Thermal

• Universal Combustion

• Co Generation

Gravitational energy is converted to electrical energy in a hydro power station

• True

• False

Answer explanation

Gravitaional to kinetic energy then electrical energy

Power stations generate various currents, normally around 11ka to 33ka

• True

• False

Answer explanation

11kv to 33kv - volts not amps

The amount of water entering the turbine is controlled by “picket gates” which rotate to either close or open and vary the amount of water flowing.

• True

• False

Answer explanation

wicket gates

The power output of the generator is varied by varying the exciter current in the generator rotor.

• True

• False

The spinning speed of water turbines is relatively high compared with gas and steam turbines.

• True

• False