WorksheetsStorage and Conversion
Total questions: 26
Worksheet time: 13mins
Capacitance is measured in
Meters
Farads (F)
Volts (V)
Ampere (A)
In Pseudo-capacitors charge stored...
Electrochemically
Electrostatically
both
by deposition
Which device can offer more power for small time
supercapacitors
batteries
both
none
unit of energy density
Wh/kg
W
W/kg
kg
unit of current density
Wh/kg
W/kg
W
Kg
Electrochemical water splitting consists of two reactions:
Oxygen reduction reaction (ORR)
Hydrogen evolution reaction (HER)
Hydrogen oxidation reaction (HOR)
Oxygen evolution reaction (OER)
Fuel cells convert a ____ (chemical energy) into _____ (electrical energy)
Bond, Electron
Fuel, Electricity
Fuel, Charge
Electron, Ion
Which of the following is true about fuel cells?
Power is defined by the fuel reservoir
Power is defined by the fuel cell size
Capacity is defined by the fuel reservoir
Capacity is defined by the fuel cell size
Which irreversible losses affect the performance of fuel cells?
Activation
Total cost
Concentration (mass transfer)
Ohmic (electrical resistance)
Capacity fade
Only hydrogen produced from water electrolysis is truly clean...
True
False
Which energy source has the greatest potential?
Nuclear
Oil, gas and coal
Solar
Hydro
Batteries are electrochemical ____ devices
Electrolysis
Storage
Conversion
Charge accumulation
Batteries are ____ devices, while fuel cells are ____ devices
Open, closed
Spontaneous, nonspontaneous
Nonspontaneous, spontaneous
Closed, open
Overall battery performance is mainly limited by the electrolytes
True
False
Metal-air batteries contain a ____ anode and an ____ cathode
Metal, air-breathing
Intercalation, metal-air
Air-breathing, metal
Metal-air, intercalation
What is the main reason why hydrogen is more difficult to store than diesel?
Hydrogen is a gas at room temperature but diesel is a liquid
Hydrogen can be liquefied by cooling it
Hydrogen can be stored under pressure
In the image there is a PEMFC. The half reaction occurring at the identified electrode is...
O2 (g) + 4H+ (aq) + 4e- → 2H2O (l)
O2 (g) + 2H2O (l) + 4e- → 4OH- (aq)
H2 (g) → 2H+ (aq) + 2e-
H2 (g) + 2OH- (aq) → 2H2O (l) + 2e-
What energy conversion occurs in fuel cells.
Chemical energy → Electrical Energy
Chemical energy → Thermal energy → Kinetic energy → Electrical Energy
Hydrogen made by using clean electricity from surplus renewable energy sources, such as solar or wind power, to electrolyze water
Blue
Green
Brown
Turquoise
(a) hydrogen is generated through electrolysis powered by nuclear energy
Name the substance that goes into the anode
water
oxygen
hydrogen
none of the above
What is the primary byproduct of a hydrogen fuel cell?
Carbon dioxide
Water
Nitrogen oxides
Sulfur dioxide
Which element is used as a catalyst in most hydrogen fuel cells?
Iron
Copper
Platinum
Zinc
What process do you use to convert fatty acids into biodiesel?
esterification
transesterification
glycerol conversion
ethanolization
All biofuels are made from
corn
animal fat
palm oil
biological ingredients
Ethanol refers to any biofuel made from:
grass
corn
plant carbohydrate
animal waste
