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Question 1. Which stage of coal formation is characterized by the highest carbon content and lowest volatile matter? A) Peat B) Lignite C) Bituminous coal D) Anthracite Answer: D Explanation: Anthracite is the highest rank of coal, formed under the greatest temperature and pressure, resulting in the highest carbon content and lowest volatiles. Question 2. The primary chemical reaction that converts organic matter into petroleum in sedimentary basins is: A) Photosynthesis B) Anaerobic decomposition C) Oxidative combustion D) Hydrothermal metamorphism Answer: B Explanation: Petroleum forms from the anaerobic decomposition of organic material under heat and pressure in the absence of oxygen. Question 3. In fractional distillation of crude oil, the fraction that boils between 150 - 200 °C is primarily: A) Light gases B) Naphtha C) Kerosene D) Heavy fuel oil Answer: B Explanation: Naphtha, used for gasoline production, typically boils in the 150-200 °C range.
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Question 4. Which of the following is a major environmental concern specific to hydraulic fracturing (fracking)? A) Acid rain formation B) Increased seismic activity C) Ozone depletion D) Thermal pollution of rivers Answer: B Explanation: The injection of high-pressure fluids can reactivate faults, leading to induced seismic events. Question 5. The greenhouse gas with the highest global warming potential (GWP) over a 100-year horizon among the listed is: A) CO₂ B) CH₄ C) N₂O D) SF₆ Answer: D Explanation: Sulfur hexafluoride (SF₆) has a GWP over 23,000 times that of CO₂, far exceeding CH₄ and N₂O. Question 6. In a Rankine cycle used for coal-fired power plants, the component that converts low-pressure steam back into water is the: A) Boiler B) Turbine C) Condenser D) Superheater Answer: C Explanation: The condenser removes latent heat from exhaust steam, turning it into saturated liquid for pump recirculation.
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B) Fuel C) Control rod material D) Secondary working fluid Answer: A Explanation: The high-pressure water slows neutrons (moderation) while removing heat from the core. Question 11. Which reactor type directly produces steam in the reactor vessel without a separate heat exchanger? A) PWR B) BWR C) CANDU D) Fast Breeder Reactor Answer: B Explanation: In a Boiling Water Reactor, water boils inside the core, generating steam that drives the turbine. Question 12. The enrichment process most commonly used to increase the concentration of U-235 is: A) Gas centrifuge B) Laser isotope separation C) Electromagnetic isotope separation D) Chemical precipitation Answer: A Explanation: Gas centrifuges spin UF₆ molecules at high speeds, separating isotopes by mass. Question 13. Which of the following incidents involved a loss of coolant accident (LOCA) that led to a partial core melt? A) Three Mile Island (1979) B) Chernobyl (1986)
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C) Fukushima Daiichi (2011) D) Windscale (1957) Answer: A Explanation: The TMI accident was characterized by a LOCA and partial core melt, but without a large release of radiation. Question 14. The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) primarily seeks to: A) Ban all civilian nuclear power B) Prevent the spread of nuclear weapons to non-nuclear states C) Eliminate uranium mining worldwide D) Mandate renewable energy adoption Answer: B Explanation: The NPT aims to prevent the proliferation of nuclear weapons while promoting peaceful nuclear technology. Question 15. The photovoltaic effect that generates electricity in a solar cell is based on: A) Thermoelectric conversion B) Photoelectric emission of electrons from a metal surface C) Creation of electron-hole pairs in a semiconductor D) Magnetic induction Answer: C Explanation: Light photons excite electrons across the bandgap in a semiconductor, creating electron-hole pairs that are separated by the p-n junction. Question 16. In a concentrated solar power (CSP) plant, the component that stores thermal energy for night-time operation is typically: A) Lithium-ion battery B) Molten-salt tank C) Flywheel
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Answer: B Explanation: Run-of-river schemes divert a portion of river flow through turbines without creating a sizable upstream reservoir. Question 20. Tidal stream generators most closely resemble which conventional technology? A) Hydroelectric dam turbines B) Wind turbine rotors C) Solar photovoltaic panels D) Geothermal binary cycles Answer: B Explanation: Tidal stream devices use rotating blades in moving water, analogous to wind turbines in air. Question 21. In a binary-cycle geothermal plant, the working fluid is typically: A) Water/steam directly from the reservoir B) Organic fluid with a lower boiling point than water C) Liquid nitrogen D) Molten salt Answer: B Explanation: Binary plants use a secondary organic fluid (e.g., isobutane) that vaporizes at lower temperatures, driving a turbine while keeping the geothermal fluid isolated. Question 22. Enhanced Geothermal Systems (EGS) create permeability in hot dry rock by: A) Hydraulic fracturing with water injection B) Chemical dissolution of minerals C) Mechanical drilling of large boreholes only D) Adding explosives to the formation Answer: A
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Explanation: EGS uses high-pressure water to fracture rock, forming a network through which heat can be extracted. Question 23. First-generation biofuels such as ethanol derived from corn are criticized because: A) They require rare earth catalysts B) They compete with food production for land C) They emit higher levels of CO₂ than gasoline D) They cannot be blended with gasoline Answer: B Explanation: Using arable land for fuel crops can reduce food availability and raise food prices. Question 24. The term “carbon-neutral” for biomass combustion assumes: A) No CO₂ is released during burning B) CO₂ emitted is offset by CO₂ absorbed during feedstock growth C) All emissions are captured by CCS D) Biomass is burned at zero temperature Answer: B Explanation: Carbon neutrality presumes the carbon released was recently captured by the growing plants, creating a closed cycle. Question 25. Which of the following storage technologies stores energy by converting electrical energy into chemical potential within a solid electrolyte? A) Lithium-ion battery B) Flow battery C) Solid-state battery D) Pumped hydro storage Answer: C Explanation: Solid-state batteries replace liquid electrolytes with solid ones, storing energy chemically in solid phases.
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A) Seasonal variations in solar output B) The shape of net load after high solar penetration, showing a midday dip and steep evening ramp C) Voltage fluctuations caused by wind farms D) A curve illustrating battery degradation over time Answer: B Explanation: The duck curve shows reduced net demand during sunny midday hours and a rapid increase in the evening as solar generation wanes. Question 30. High-Voltage Direct Current (HVDC) transmission is preferred over AC for: A) Short-distance urban distribution B) Long-distance, low-loss power transfer C) Supplying residential rooftop solar D) Feeding isolated islands with diesel generators Answer: B Explanation: HVDC has lower line losses and can transmit large power over thousands of kilometers more efficiently than AC. Question 31. In post-combustion carbon capture, the most common solvent used to absorb CO₂ is: A) Ammonia B) Monoethanolamine (MEA) C) Sodium hydroxide D) Calcium carbonate Answer: B Explanation: MEA chemically reacts with CO₂ in flue gases, allowing subsequent regeneration and CO₂ release. Question 32. Direct Air Capture (DAC) differs from post-combustion capture because DAC: A) Removes CO₂ directly from ambient air
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B) Is only applicable to power plants C) Uses cryogenic separation exclusively D) Requires a coal-fired boiler to operate Answer: A Explanation: DAC systems capture CO₂ from the atmosphere, independent of point-source emissions. Question 33. The Levelized Cost of Energy (LCOE) metric is expressed in: A) Gigajoules per year B) Dollars per megawatt-hour ($/MWh) C) Kilograms of CO₂ per kWh D) Watts per kilogram of fuel Answer: B Explanation: LCOE represents the average net present cost of electricity generation per unit of energy produced, typically $/MWh. Question 34. Under the Paris Agreement, the primary global temperature goal is to limit warming to: A) 1 °C above pre-industrial levels B) 2 °C above pre-industrial levels, with efforts to stay below 1.5 °C C) 3 °C above pre-industrial levels D) 4 °C above pre-industrial levels Answer: B Explanation: The Agreement aims for “well-below 2 °C” and pursues efforts to limit the increase to 1.5 °C. Question 35. A carbon tax is designed to: A) Cap total emissions at a fixed quantity B) Provide a per-ton price signal to emitters, encouraging reduction C) Subsidize fossil fuel extraction
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Answer: C Explanation: Pumped-hydro facilities can operate for decades with virtually no loss of capacity, unlike batteries that degrade over cycles. Question 39. In the context of natural gas, the term “dry gas” refers to: A) Gas with no water vapor content B) Gas extracted from shale formations C) Gas that is 100 % methane by volume D) Gas that has been dehydrated for pipeline transport Answer: D Explanation: Dry gas is processed to remove water vapor, preventing pipeline corrosion and hydrate formation. Question 40. The term “oil sands” is most accurately described as: A) Conventional crude oil reservoirs with high viscosity B) A mixture of sand, water, clay, and bitumen requiring upgrading C) Shale formations rich in liquid hydrocarbons D) Offshore tar deposits formed by marine organisms Answer: B Explanation: Oil sands contain bitumen—a heavy, viscous petroleum—mixed with sand and water, requiring extraction and upgrading. Question 41. Which of the following is NOT a typical component of a modern smart grid? A) Advanced metering infrastructure (AMI) B) Distributed generation control algorithms C) Centralized analog voltage regulators only D) Real-time demand response platforms Answer: C Explanation: Smart grids rely on digital, not solely analog, controls; centralized analog regulators alone do not constitute a smart grid.
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Question 42. The primary purpose of a control rod in a nuclear reactor is to: A) Cool the reactor core B) Absorb neutrons and regulate the fission rate C) Generate electricity directly D) Provide structural support to fuel assemblies Answer: B Explanation: Control rods contain neutron-absorbing materials (e.g., boron, cadmium) that can be inserted or withdrawn to control reactivity. Question 43. In a Boiling Water Reactor, the steam that drives the turbine is: A) Superheated in a secondary loop B) Directly generated in the reactor core C) Produced by a heat exchanger using a separate coolant D) Generated by a separate boiler downstream of the reactor Answer: B Explanation: BWRs boil water inside the reactor vessel, producing steam that goes straight to the turbine. Question 44. The term “fast breeder reactor” refers to a design that: A) Uses heavy water as moderator to increase neutron economy B) Converts fertile U-238 into fissile Pu-239, producing more fuel than it consumes C) Operates at low temperatures to improve safety D) Employs thorium as the sole fuel source Answer: B Explanation: Fast breeders use fast neutrons to transmute U-238 into Pu-239, achieving a net gain in fissile material. Question 45. Which of the following best describes the “sulfur-iodine” cycle? A) A thermochemical process for hydrogen production using heat from nuclear reactors
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C) (Peak power output) ÷ (Installed capacity) D) (Annual CO₂ emissions) ÷ (Installed capacity) Answer: B Explanation: Capacity factor measures the ratio of actual energy generated to the theoretical maximum if the plant ran at nameplate capacity continuously. Question 49. Which of the following is a primary advantage of solid-oxide fuel cells (SOFC) over PEM fuel cells? A) Ability to operate on hydrocarbon fuels directly B) Lower operating temperature (<100 °C) C) Faster start-up times D) Use of liquid electrolytes Answer: A Explanation: SOFCs operate at 600- 1000 °C, allowing internal reforming of hydrocarbons, whereas PEMFCs require pure hydrogen. Question 50. In the context of climate policy, “additionality” refers to: A) The extra cost of renewable technologies B) Emissions reductions that would not have occurred without a specific project or mechanism C) The increase in electricity demand caused by electric vehicles D) The supplemental capacity added to the grid during peak hours Answer: B Explanation: Additionality ensures that carbon offset projects deliver real, measurable reductions beyond business-as-usual scenarios. Question 51. Which of the following best describes the main source of methane (CH₄) emissions from the natural gas supply chain? A) Combustion in power plants B) Leakage during extraction, processing, and distribution (fugitive emissions) C) Oxidation of CO₂ in pipelines
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D) Dissolution in groundwater Answer: B Explanation: Fugitive methane leaks are the dominant source of CH₄ emissions throughout the natural gas lifecycle. Question 52. The term “oil-in-place” (OIP) refers to: A) The amount of oil that can be recovered with current technology B) The total volume of oil estimated to exist in a reservoir, regardless of recoverability C) The daily production rate of an oil field D) The amount of oil stored in strategic reserves Answer: B Explanation: OIP is the total estimated oil contained in a reservoir before accounting for recovery factors. Question 53. Which of the following is NOT a typical environmental impact of surface coal mining? A) Habitat fragmentation B) Acid mine drainage C) Increased seismicity due to subsidence D) Large-scale deforestation Answer: C Explanation: Increased seismicity is more associated with deep mining or underground operations, not surface mining. Question 54. In a coal-fired power plant, the term “stack effect” primarily influences: A) Boiler efficiency B) Flue gas temperature C) Natural draft of combustion gases up the chimney D) Coal pulverization rate
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Explanation: HLW includes spent fuel assemblies and materials with high radioactivity and heat generation. Question 58. Which of the following statements best characterizes the “fuel cycle” of a CANDU reactor? A) Uses natural uranium and heavy water as moderator, requiring no enrichment B) Requires enriched uranium and light water moderator C) Operates on thorium-uranium mixed oxide fuel D) Uses fast neutrons and liquid metal coolant Answer: A Explanation: CANDU reactors can use natural uranium because heavy water provides excellent moderation without enrichment. Question 59. The “Heat Rate” of a power plant is defined as: A) The amount of heat rejected per unit of electricity generated (Btu/kWh) B) The temperature difference across the turbine C) The rate at which fuel is burned (kg/s) D) The ratio of CO₂ emissions to megawatt-hours produced Answer: A Explanation: Heat rate measures plant efficiency; lower heat rates indicate higher efficiency. Question 60. Which of the following is a primary advantage of offshore wind turbines compared to onshore? A) Lower installation costs B) Higher capacity factor due to stronger, more consistent winds C) Easier access for maintenance crews D) No need for submarine cables Answer: B Explanation: Offshore sites benefit from higher wind speeds and lower turbulence, leading to higher capacity factors.
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Question 61. In the context of solar photovoltaics, “spectral mismatch loss” occurs because: A) The sun’s spectrum changes with latitude B) The solar cell does not absorb all wavelengths equally, leading to unused photon energy C) Cloud cover reduces incident light intensity D] The cells are tilted incorrectly Answer: B Explanation: Different semiconductor bandgaps absorb only certain photon energies; photons outside that range are not converted, causing spectral losses. Question 62. Which renewable technology uses a “Rankine-type” cycle but with a low-boiling-point organic fluid? A) Concentrated solar power (CSP) with molten salt B) Binary-cycle geothermal plant C) Photovoltaic solar panel D) Wind turbine gearbox Answer: B Explanation: Binary geothermal plants employ an organic Rankine cycle (ORC) using fluids like isobutane. Question 63. The term “capacity credit” for a renewable resource quantifies: A) Its contribution to peak load relative to its installed capacity B) Its total annual energy production C) The amount of land required per megawatt D) The cost per kilowatt-hour of storage Answer: A Explanation: Capacity credit measures the reliability of a renewable source in meeting peak demand, considering intermittency.
