Power Plant Engineering – Verified PYQ Authority Guide
Power Plant Engineering is a sub-subject authority hub. It is designed to expose the important topic/concept clusters represented by verified SRO PYQs and guide students from broad revision into the exact solved questions that support each area. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
11 verified PYQs are currently mapped to this Sub Subject hub. The represented years include 2025. Exam coverage currently includes Assistant Engineer (Electrical), Class-2, Road and Building Department. Subject context includes Electrical Engineering. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- A new renewable energy system is designed to harvest energy from wind. The total energy required to build the system is 240 kJ. The energy yield ratio of the system is 14:3.…
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Energy Yield Ratio
An energy yield ratio of 14:3 means energy delivered : energy invested = 14 : 3. For 240 kJ invested, lifetime energy yield is… - What is the function of a cooling tower in a steam power plant?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Cooling Tower Function
A cooling tower rejects waste heat from the condenser cooling-water circuit to the atmosphere, lowering the water temperature so it can be recirculated through… - What is the efficiency of a typical steam power plant?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Typical Thermal Efficiency
A conventional steam power plant typically converts roughly 30–40% of fuel heat into electrical output, depending on steam conditions, reheat/regeneration and plant technology. The… - Which of the following is NOT a type of fuel used in a steam power plant?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Steam Plant Fuel Types
Uranium is not a combustion fuel for a conventional steam power plant; it is nuclear fuel used in a reactor to produce heat through… - What is the purpose of a condenser in a steam power plant?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Condenser Function
The condenser removes latent heat from turbine exhaust steam and converts it back into water (condensate), while maintaining a low exhaust pressure that improves… - What is the primary function of a boiler in a steam power plant?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Boiler Function
The boiler's primary function is to transfer heat from fuel/heat source to feedwater and convert the water into high-pressure steam for the turbine. - In a thermal power station, coal is used for the generation of electricity. How energy changes from one form to another before it is transformed into electrical energy?
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Coal-to-Electricity Energy Chain
Coal's chemical energy is released as heat in the boiler; steam carries that thermal energy to the turbine, where it becomes mechanical shaft energy;… - When the momentum of a body is doubled, its kinetic energy ___________
Assistant Engineer (Electrical), Class-2, Road and Building Department · 2025 · Kinetic Energy vs Momentum
For constant mass, kinetic energy is K=p²/(2m). Doubling momentum therefore multiplies kinetic energy by 2²=4. The GPSC final key revised the provisional answer to…
Formula & key-relationship bank from verified solutions
E_yield / E_build = 14/3 E_yield = 240 × 14/3 = 1120 kJTurbine exhaust steam → condenser → heat to cooling water Warm cooling water → cooling tower → heat to atmosphereη_plant = Electrical energy output / Fuel heat input ×100%Fossil steam plant: chemical combustion heat Nuclear plant: fission heatSteam → condenser heat rejection → liquid condensateHeat input → water/feedwater → steam (often superheated)
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- An energy yield ratio of 14:3 means energy delivered : energy invested = 14 : 3. For 240 kJ invested, lifetime energy yield is 240×14/3 = 1120 kJ.
- A cooling tower rejects waste heat from the condenser cooling-water circuit to the atmosphere, lowering the water temperature so it can be recirculated through the condenser.
- A conventional steam power plant typically converts roughly 30–40% of fuel heat into electrical output, depending on steam conditions, reheat/regeneration and plant technology. The rest is rejected mainly in the condenser and stack.
- Uranium is not a combustion fuel for a conventional steam power plant; it is nuclear fuel used in a reactor to produce heat through fission. Coal, natural gas and oil can all be burned in thermal/steam plants.
- The condenser removes latent heat from turbine exhaust steam and converts it back into water (condensate), while maintaining a low exhaust pressure that improves turbine work output.
Exam tips already validated in SRO solutions
- Do a magnitude check: yield must exceed 240 kJ.
- Track which fluid each component acts on.
- Do not confuse boiler efficiency with overall station efficiency.
- Interpret the conventional plant context in the options.
- Cooling water removes heat from steam; it does not mix with condensate in a surface condenser.
Common mistakes to avoid
- Inverting 14:3 and obtaining a value below the energy invested.
- Calling the cooling tower a device that directly condenses turbine exhaust steam.
- Choosing 70–80%, which is far beyond typical standalone steam-cycle electrical efficiency.
- Choosing natural gas because combined-cycle plants also use gas turbines; gas can still raise steam in boilers/HRSG systems.
- Confusing condenser with cooling tower—the cooling tower cools circulating cooling water.
Topic and concept coverage
Mapped topic labels include Steam Power Plants, Engineering Mechanics, Load Curves and Tariffs, Power Plant Economics, Power System Operation, Renewable Energy, Thermal Power Plants. The concept trail includes Annual Average Load, Boiler Function, Coal-to-Electricity Energy Chain, Cold Reserve, Condenser Function, Cooling Tower Function, Energy Yield Ratio, Kinetic Energy vs Momentum. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with Electrical Engineering, Engineering Mechanics, Load Curves and Tariffs, Power Plant Economics, Power System Operation, Renewable Energy, Steam Power Plants, Annual Average Load, Boiler Function, Coal-to-Electricity Energy Chain, Cold Reserve. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.