MCQ
Energy Storage MCQ - Practice Questions with Answers
Solve 83 Energy Storage questions for RAS/RPSC preparation.
Practice questions
Q1Consider the following statements about policy measures for ESS in India: 1. Complete waiver of ISTS charges was made applicable to BESS and PSP projects commissioned up to 30 June 2025, subject to conditions. 2. The transmission charges after 30 June 2025 were to be increased by 25% every month until 2028. 3. Consumer rules asked users of diesel generator sets as essential backup to endeavour to shift to cleaner technology such as renewable energy with battery storage. 4. The Ministry of Power's March 2022 BESS procurement guidelines excluded ancillary services. Which of the statements given above are correct?
Statements 1 and 3 are correct. Statement 2 is false because the increase is annual, not monthly. Statement 4 is false because the guidelines include ancillary services.
Q2Consider the following statements about flow batteries: 1. Flow batteries involve two different liquid electrolytes that pass ions or protons through a porous membrane. 2. Their energy storage is fixed by a sealed internal cell, so increasing electrolyte tank size does not increase stored energy. 3. A vanadium redox flow battery uses two tanks of electrolyte solutions, one for the cathode and the other for the anode. 4. Flow batteries can be attractive because their energy and power can be changed independently. Which of the statements given above are correct?
Statement 1 is true. Statement 2 is false because PNNL states that larger electrolyte supply tanks allow a flow battery to store more energy. Statement 3 is true for vanadium redox flow batteries. Statement 4 is true because independent change of energy and power is listed as an attractive feature.
Q3Consider the following statements: 1. India needs hydro pumped storage projects to support faster energy transition with large-scale renewable integration. 2. CEA accorded concurrence to the 600 megawatt Upper Indravati pumped storage project in Odisha. 3. CEA accorded concurrence to a 2000 megawatt Sharavathy pumped storage project in Kerala. Which of the statements given above are correct?
Statements 1 and 2 are correct according to the PIB release. Statement 3 is false because the cited Sharavathy project is in Karnataka, not Kerala.
Q4Consider the following statements about classification and use of storage technologies: 1. MNRE lists mechanical, thermal, electrochemical, electrical and chemical storage systems as broad energy storage technology categories. 2. The most common type of energy storage in the power grid is pumped hydropower. 3. Lithium-ion is the only common chemistry for battery cells mentioned by DOE; lead-acid and sodium-based batteries are not common options. 4. Solar-plus-storage can provide backup power during an electrical disruption. Which of the statements given above are correct?
Statement 1 is true from MNRE's category list. Statement 2 is true according to DOE's solar-storage primer. Statement 3 is false because DOE also lists lead-acid, sodium and nickel-based batteries as common options. Statement 4 is true: solar and storage can provide backup power during disruption.
Q5Consider the following statements about storage technologies and grid services: 1. Flywheel energy storage systems store kinetic energy in a spinning mass called a rotor. 2. A flywheel charges by applying a braking torque that decelerates the rotor and discharges by accelerating the rotor with a motor. 3. Many battery systems, flywheels and supercapacitors can provide rapid response from a few minutes down to fractions of a second for voltage and frequency quality. 4. Pumped-hydro, compressed-air and large energy-capacity battery systems can supply electricity consistently over several hours or more and are used mainly to moderate daily and seasonal demand variations. Which of the statements given above are correct?
Statement 1 is true. Statement 2 is false because flywheels charge by accelerating the rotor and discharge by decelerating it while returning electrical power. Statements 3 and 4 are true descriptions of short-response and longer-duration storage roles from EIA.
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6Consider the following statements: 1. In a lithium-ion battery, the electrolyte carries positively charged lithium ions between the anode and cathode through the separator. 2. The separator blocks the flow of electrons inside the battery. 3. The electrolyte blocks all lithium-ion movement between the anode and cathode. Which of the statements given above are correct?
7Consider the following statements about lithium-ion batteries: 1. During discharge, the cathode releases lithium ions to the anode. 2. The separator blocks the flow of electrons inside the battery. 3. Energy density is measured in watts per kilogram. Which of the statements given above are correct?
8Consider the following statements about DPR timelines, HP-DAM and infrastructure status for storage in India: 1. The CEA reduced DPR preparation timelines for PSPs in Himalayan and non-Himalayan regions from 900 days to 840 and 690 days, respectively, depending on geology. 2. For certain PSPs allotted through tariff-based competitive bidding, CEA reduced the concurrence timeline to 50 days. 3. BESS was included among eligible generators allowed to participate in the HP-DAM segment of the energy exchange. 4. The Harmonized Master List defines ESS with a minimum qualifying capacity of 20 MWh when not established on merchant basis. Which of the statements given above are correct?
9Consider the following statements about lithium-ion batteries: 1. A lithium-ion battery has an anode, cathode, separator, electrolyte and two current collectors. 2. The electrolyte carries positively charged lithium ions between the anode and cathode through the separator. 3. During discharge, the cathode releases lithium ions to the anode. 4. Energy density is measured in watt-hours per kilogram, while power density is measured in watts per kilogram. Which of the statements given above are correct?
101. Lithium-ion batteries vary by cathode chemistry, and examples include lithium cobalt oxide, lithium nickel cobalt aluminum oxide, and lithium iron phosphate. 2. Lithium cobalt oxide chemistries are stated by the EPA as often used for electric vehicle batteries. 3. Lithium-ion cells contain only cathode and anode layers; no separator is involved. 4. Battery packs for applications needing more energy, such as an electric vehicle, may require hundreds or thousands of cells packaged as modules. Which of the statements given above are correct?
11Consider the following statements about pumped storage project preparation in India: 1. CEA issued guidelines for formulation of DPRs for pumped storage schemes in June 2023. 2. The DPR preparation timeline for Himalayan PSPs was reduced to 840 days depending upon geology. 3. The DPR preparation timeline for non-Himalayan PSPs was increased from 900 days to 990 days. Which of the statements given above are correct?
12Consider the following statements: 1. A lithium-ion battery includes an anode, cathode, separator and electrolyte. 2. In such a battery, the anode and cathode store lithium. 3. The separator is the part that stores the lithium in place of the electrodes. Which of the statements given above are correct?
13Consider the following statements about basic battery working: 1. DOE says batteries use chemistry, in the form of chemical potential, to store energy. 2. A battery has a cathode and an anode separated by an electrolyte. 3. In a lithium-ion battery, the separator allows electrons to flow inside the battery. Which of the statements given above are correct?
141. Under IndiaтАЩs Battery Waste Management Rules, 2022, all types of batteries including electric vehicle, portable, automotive and industrial batteries are covered. 2. The rules operate on Extended Producer Responsibility, making producers including importers responsible for collection and recycling or refurbishment of waste batteries. 3. The rules prohibit disposal of collected waste batteries in landfills and incineration under EPR. 4. The rules replaced IndiaтАЩs E-Waste Management Rules, 2016. Which of the statements given above are correct?
15Consider the following statements about non-battery storage technologies: 1. Thermal energy storage can use a fluid such as water or molten salt to store heat. 2. A flywheel stores energy by chemically converting water into hydrogen and oxygen. 3. Compressed air storage systems can use large vessels or natural formations such as caves. 4. Flywheels can quickly provide power but cannot store a lot of energy. Which of the statements given above are correct?