| 1. |
Energy storage devices can be categorized as |
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mechanical |
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electrochemical |
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chemical |
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electrical |
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thermal devices |
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All Above |
| 2. |
Battery technologies for energy storage devices can be differentiated on the basis of energy density, charge and discharge (round trip) efficiency, life span, and eco-friendliness of the devices (Figure 1.4) |
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True |
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False |
| 3. |
Fig 1.7 shows: |
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A computer main frame developed in early 80s |
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Schematic of battery energy storage system |
| 4. |
Lead-Acid (PbA) Battery is a secondary cell type battery that is widely used in vehicles and other applications requiring high values of load current. Its main benefits are low capital costs, maturity of technology, and efficient recycling. |
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True |
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False |
| 5. |
Nickel-Cadmium (Ni-Cd) Battery is a ___________ battery used for portable computers, drills, camcorders, and other small battery-operated devices requiring an even power discharge
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Rechargeable |
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Non-rechargeable |
| 6. |
The Ni-MH battery combines the proven positive electrode chemistry of the sealed Ni-Cd battery with the energy storage features of metal alloys developed for advanced hydrogen energy storage concepts (Moltech Power Systems 2018). Ni-MH batteries outperform other rechargeable batteries, and have higher capacity and less voltage depression (Table 1.6).
The Ni-MH battery currently finds widespread application in _________________________, where battery performance parameters, notably run time, are major considerations in the purchase decision.
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High-end portable electronic products |
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Low-end calculator and watch batteries |
| 7. |
Lithium-Ion (Li-Ion) Batterychemistries have the highest energy density and are considered safe. No memory or scheduled cycling is required to prolong battery life. Li-Ion batteries are used in electronic devices such as cameras, calculators, laptop computers, and mobile phones, and are increasingly being used for electric mobility. |
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True |
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False |
| 8. |
Sodium–Sulfur (Na-S) Batteryor liquid metal battery is a type of molten metal battery constructed from sodium and sulfur. It exhibits a high energy density, high efficiency of charge and discharge (89%-92%), and a long cycle life, and is fabricated from inexpensive materials (Table 1.9). However, because of its high operating temperatures of 300°C-350°C and the highly corrosive nature of sodium polysulfides, such cells are primarily used for |
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large-scale nonmobile applications such as electricity grid energy storage |
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Everyday use batteries such as A series batteries ( A, AA, AAA) |
| 9. |
Redox Flow Battery (RFB) are charged and discharged by means of the oxidation-reduction reaction of ions of vanadium or the like.They have excellent characteristics: a long service life with almost no degradation of electrodes and electrolytes, high safety due to their being free of combustible materials, and availability of operation under normal temperatures. The possibility of fire with Redox flow batteries are |
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High |
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Low |
| 10. |
Frequency regulation is |
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The constant second-by-second adjustment of power to maintain system frequency at the nominal value (50 or 60 Hz) to ensure grid stability (Figure 3.2). |
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Is the regulating the broadcast frequency of the cell towers of the cell phone use during the day |
| 11. |
Future power systems are expected to rely significantly on renewable energy sources (RESs) such as wind and solar. |
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However, The variability and intermittence of solar photovoltaic and wind-power generation present challenges for safe and reliable grid integration. |
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The power system will be 100% reliable when all fossil fuels are obsolete and we solely rely on wind and solar.
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| 12. |
The forecast for wind-power generationis more challenging than that for solar photovoltaic. Large variations can occur within minutes. Wind turbines are usually disabled when wind speed exceeds 25 meters per second, potentially resulting in a large drop in power generation.
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True |
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False |
| 13. |
Peak shaving. The reduction of electric power demand during times when network capacity is stressed is known as peak shaving (Figure 3.7). Peak shaving helps defer investments in network expansion or network reinforcement.
Peak shaving also helps the utility meet demand without having to ramp up expensive peaking generators. In the long run, peak shaving allows investment deferral in the building of new power plants. Customers that install on-site power generation __________ in those savings by receiving reduced power tariffs or in some cases capacity payments (such as in the United Kingdom [UK]).
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Share |
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Cannot share |
| 14. |
Microgrids (Figure 3.15) can be thought of as miniature electric power networks that can operate independently or while connected to the larger utility grid. Microgrids connected to an external grid are defined as interconnected loads and distributed energy resources within clearly defined electrical boundaries that act as a single controllable entity.
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True |
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False |
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