Renewable Energy Practice Test 7

1. _________ is an example of storing wind energy chemically.

Pumped storage

Batteries

Electro-hydrogen generation

Flywheels

2. Power generation contains ________

kinetic systems

nuclear systems

mechanical systems

electromagnetic and electrical subsystems

3. Higher air density leads to higher power output.

False

True

4. What is a planetary shaft gearbox?

Input shaft and output shaft are aligned

Motor shaft and the speed controller shaft are on parallel planes

Input shaft and output shaft are parallel

Motor shaft and the speed controller shaft are on perpendicular planes

5. What is memory effect?

Pumped storage

Electro-hydrogen generation

Remembering a charging level

Electric grid

6. Which of the following methods are used to store wind energy?

Glowing a bulb

Electro-chemical

Turning off consumer electrical appliances when not in use

Running a consumer electrical appliance

7. Which of the following does the local air density depend upon?

Altitude and pressure

Nitrogen and oxygen

Soil

Lightning

8. Which of the following is true?

More than 50% of the land area on earth can generate 1W per square meter

Less than 5% of the land area on earth can generate 1W per square meter

More than 80% of the land area on earth can generate 1W per square meter

60 - 80% of the land area on earth can generate 1W per square meter

9. Which of the following is an application of pumped hydro-electric storage?

Energy source

Frequency regulation only in pumping mode

Absorbs power to increase the net expenses

Frequency regulation in both pumping and generation modes

10. How is the speed varied in limited variable speed WECS?

Variable rotor

Fixed rotor resistance

Fixed capacitance

Variable rotor resistance