WorksheetsSolar PV
Total questions: 31
Worksheet time: 16mins
How much time does it take for the Earth to receive enough solar energy to meet our annual needs?
Less than an hour
Less than a day
Less than a week
Less than a month
What is the effective power range of an individual solar cell?
0.5 to 1.5 W
2 to 3 W
5 to 10 W
10 to 15 W
What can be used in addition to photovoltaic panels to increase the efficiencies of solar cells?
Solar batteries
Solar concentrators
Solar inverters
Solar reflectors
Einstein's recognition about light striking a material suggests that light delivers energy in the form of a:
Wave
Particle
Photon
Continuous stream
The amount of energy delivered by a photon depends on the:
Intensity of the radiation
Mass of the photon
Frequency of the radiation
Speed of the radiation
For an electron to be promoted from the valence band to the conduction band, the energy absorbed must be:
Less than the bandgap
Equal to the bandgap
At least as large as the bandgap
Twice as large as the bandgap
How do atomic orbitals combine in the context of semiconductors?
By ionic bonding.
By metallic bonding.
Covalently.
They do not combine.
Which type of semiconductor is created by adding impurities that provide extra electrons?
p-type
n-type
Intrinsic
Extrinsic
What happens when electrons in a semiconductor are promoted to the conduction band?
Holes are generated in the valence band
The Fermi level decreases
The bandgap increases
The semiconductor becomes an insulator
What is the process called in which an impurity is added to the solid-state structure to improve the concentration of holes and electrons?
Doping
Bonding
Fusing
Mixing
What is the process called in which an impurity is added to a semiconductor to improve its conductivity by altering the concentration of holes and electrons?
Doping
Bonding
Junction formation
Ion implantation
What are the two types of extrinsic semiconductors mentioned in the text?
Homojunctions and heterojunctions
Homounions and heterounions
Homogeneous and heterogeneous
Homojunctions and heterounions
How are the layers generally arranged in a multi-junction solar cell?
In a random order
In several contiguous layers
Separately with large gaps between each layer
In a single layer
Which material absorbs the lowest energy photons (<1.1 eV) in the diagram of the multi-junction solar cell?
AlGaAs
GaAs
Si
None, they pass through
What condition leads to the maximum cell voltage in a solar cell?
Short-circuit condition
Maximum power condition
Open circuit condition
Maximum current density
What is the ideal shape of the current-voltage plots for maximum efficiency in solar cells?
Triangular
Circular
Rectangular
Sinusoidal
What happens to the efficiency of solar cells as the temperature increases?
It increases
It decreases due to an increase in open circuit voltage
It decreases due to a drop in open circuit voltage
It remains constant
What is the lifespan of silicon solar cells commonly used throughout the world?
10 to 15 years
20 to 30 years
35 to 45 years
5 to 10 years
What are the current laboratory efficiencies for a single crystal Si solar cell approximately?
5%
10%
15%
20%
Metallurgical grade Si is produced from which compound, making it economical and abundant?
SiCl4
SiH4
SiO2
SiC
What are the chemical equations representing the production of semiconductor grade Si (scSi) from SiO2?
SiO2 + 2C → Si + 2CO;
Si(powder) + HCl → Cl3SiH + H2;
Cl3SiH + H2 → Si + 3HCl
SiO2 + Si → Si + SiO2;
Si(powder) + H2 → Cl2SiH2 + HCl;
Cl2SiH2 + HCl → Si + 2HCl
SiO2 + 2H2 → Si + 2H2O;
Si(powder) + Cl2 → Cl2SiH2 + H2;
Cl2SiH2 + H2 → Si + 2HCl
SiO2 + 4HCl → SiCl4 + 2H2O;
SiCl4 + 2H2 → Si + 4HCl
What is the purpose of adding a reflective coating such as silicon nitride to inorganic solar cells?
To increase the absorption of incident light
To minimize reflectance
To conduct electricity more efficiently
To protect the solar cells from physical damage
What are the two main reaction mechanisms in batteries?
Oxidation and Reduction
Reconstitution and Insertion
Decomposition and Recombination
Substitution and Elimination
In the context of battery reaction mechanisms, what does the formation reaction entail?
A new phase is generated in both of the electrodes.
A new phase is generated in one of the electrodes.
Two new phases are generated in one of the electrodes.
No new phase is generated; existing phases are altered.
Which of the following represents a displacement reaction in batteries?
A → AB
A + B → AB
A + BX → AX + B
AB → A + B
What term is used to describe reactions where species are incorporated between sheets of crystals?
Substitution reactions
Intercalation reactions
Displacement reactions
Addition reactions
What happens to the composition of the crystal during an insertion reaction in batteries?
It changes the chemical composition.
It changes the atomic structure.
It does not change the composition, only its volume.
It reduces the crystal to a simpler form.
When energy and power are expressed per unit mass in batteries, what are these measurements called?
Energy density
Power density
Specific energy and power
Life cycle
What term is used to describe the amount of energy stored per unit of volume in batteries?
Specific energy
Energy density
Power density
Cost efficiency
For which application is energy density an important consideration?
Propulsion vehicles
Portable electronic applications
Portable tool applications
Large-scale energy storage
What does the term "power density" refer to in the context of batteries?
Power per unit mass
Energy per unit volume
Power per unit volume
Energy per unit mass
