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WorksheetsRenewable Energy for AB Applications (Reviewer Midterm1)
Total questions: 28
Worksheet time: 14mins
Which of the following is NOT a characteristic of renewable energy?
Sustainable and unlimited supply
Produces low to zero carbon emissions
Cannot be replenished naturally
Includes sources like solar and wind energy
What causes wind to form on Earth?
The Earth's gravitational pull
The rotation of the moon around the Earth
Uneven heating of the Earth’s surface by the sun
Human activities
The standard measure of beam solar radiation is called:
Global radiation
Direct solar irradiance
Diffuse solar irradiance
Solar constant
What is the typical efficiency range of monocrystalline solar panels?
5 – 8%
15 – 22%
30 – 40%
50 – 60%
Which of the following is a factor affecting wind power?
Wind speed variations
Air temperature
Land use planning
All of the above
What is the purpose of a pyranometer?
Measures only direct solar radiation
Measures only wind speed
Measures global solar radiation
Measures temperature variations
What is the tilt angle (β) of a horizontal solar collector?
0°
45°
90°
180°
Which type of wind turbine has blades that face the wind and require a yaw mechanism to adjust direction?
Vertical-axis wind turbine
Horizontal-axis wind turbine
Darrieus turbine
Savonius turbine
The power available in the wind is proportional to which factor?
Wind speed cubed
Wind density squared
Air pressure
Solar irradiance
What is the function of an inverter in a solar PV system?
Converts AC power to DC power
Converts DC power to AC power
Stores energy for later use
Regulates temperature of solar panels
In off-grid PV systems, batteries are used to:
Convert solar energy into electricity
Store excess electricity for later use
Reduce the cost of the system
Increase solar panel efficiency
What is the standard air density at sea level?
1.0 kg/m³
1.225 kg/m³
2.5 kg/m³
3.14 kg/m³
A solar collector with a concentration ratio of 1 is classified as:
A point-focusing collector
A cylindrical parabolic collector
A flat-plate collector
A heliostat
What is the equation for calculating available wind power?
P=1/2ρAV^3
P=1/2ρAV^2
P=1/2AV^3
P=1/2ρAV
The power coefficient (Cp) for an ideal wind turbine is approximately:
1.0
0.75
0.593
0.30
The azimuth angle of a solar collector describes:
The deviation from true north
The angle between the sun’s rays and the horizon
The intensity of sunlight
The efficiency of the solar collector
What is the main disadvantage of vertical-axis wind turbines (VAWT)?
Cannot operate in low wind speeds
Require high maintenance
Lower efficiency compared to horizontal-axis turbines
Cannot generate electricity
Which factor affects the performance of a solar panel?
Temperature
Shading
Dirt and dust accumulation
All of the above
Which component of a wind energy system captures kinetic energy from the wind?
Gearbox
Rotor blades
Generator
Inverter
The Betz limit states that the maximum efficiency of a wind turbine is:
75%
59.3%
40%
90%
What happens when a wind turbine reaches its cut-out wind speed?
It generates maximum power
It stops operation to prevent damage
It operates at full efficiency
It increases its rotational speed
Which material is commonly used in solar photovoltaic cells?
Copper
Aluminum
Silicon
Carbon fiber
In wind energy systems, the rotor tip speed ratio is defined as:
Blade tip speed divided by wind speed
Wind speed divided by blade tip speed
Generator power divided by wind speed
Air density multiplied by rotor speed
The primary purpose of a charge controller in a PV system is to:
Increase solar panel output
Prevent overcharging of batteries
Convert DC to AC
Reduce shading losses
Which type of solar collector is best suited for large-scale electricity generation?
Flat-plate collector
Cylindrical parabolic collector
Unglazed perforated collector
Back-pass solar collector
What is the typical lifespan of a well-maintained solar PV module?
5 – 10 years
15 – 20 years
25 – 30 years
50 – 60 years
What is the most significant limitation of wind energy?
High carbon emissions
Intermittent availability of wind
Requires fossil fuels to operate
Cannot be used for electricity generation
The equation to calculate solar time is:
Solar Time = Standard Time + (4 × (LST - Lloc)) + E
Solar Time = Standard Time - (4 × (LST - Lloc)) + E
Solar Time = Standard Time + (2 × (LST - Lloc)) - E
Solar Time = Standard Time - (2 × (LST - Lloc)) - E
