What are the core performance requirements for an efficient combustion chamber___________________?
Show answer Hide answer
Answer: E. high power output and high thermal efficiency
Explanation
An efficient combustion chamber must generate high power output while maintaining high thermal efficiency and complete fuel oxidation. Balancing rapid flame propagation with minimal heat loss ensures optimal conversion of chemical fuel energy into mechanical work. Optimized chamber geometry prevents incomplete combustion and reduces parasitic energy losses during the engine power stroke. Internal combustion engines rely on enclosed chambers where air-fuel mixtures ignite to produce high-pressure expanding gases. Thermal efficiency measures how effectively an engine converts the total fuel heat energy input into useful crankshaft work output. Combustion chamber design involves fluid dynamics, thermodynamic heat transfer, and chemical kinetics principles working together.
High or low compression ratios alone do not define overall efficiency unless paired with proper combustion chamber geometry. Low volumetric efficiency is highly undesirable because it starves the engine of incoming air and reduces maximum power output. Minimum turbulence prevents proper air-fuel mixing, leading to slow combustion, unburned hydrocarbons, and poor thermal efficiency.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What purpose does tertiary combustion air serve in a furnace____________________?
Show answer Hide answer
Answer: E. convert CO (formed in lower zone of furnace) into C02 at higher zone
Tertiary combustion air is introduced into the upper furnace zones to complete the oxidation of carbon monoxide (CO) into carbon dioxide (CO2). Injecting air at higher levels ensures complete combustion of unburned gases...
Q2. What alloy is commonly selected for electric heating coils and resistance elements____________________?
Show answer Hide answer
Answer: A. nichrome
Nichrome possesses exceptionally high electrical resistance properties which generate heat efficiently. The inclusion of chromium provides superior oxidation resistance at elevated operational temperatures. These combine...
Q3. What is the primary function of a steam drum in a boiler_____________________?
Show answer Hide answer
Answer: D. separate steam from water
Boiler feedwater enters the steam drum where boiling generates a mixture of high-pressure water and vapor. Internal baffles and cyclone separators mechanically remove entrained water droplets from the generated steam. Th...
Q4. What is the capacity of the largest thermal power generation unit currently running in India ________________?
Show answer Hide answer
Answer: E. 500 MW
Thermal power generation units in various large-scale stations reach individual capacities up to 500 MW. Electrical grids in major developing nations incorporate large subcritical and supercritical thermal units rated at...
Q5. What are the primary elemental components of Hastelloy alloys_________________?
Show answer Hide answer
Answer: B. nickel, molybdenum etc
Hastelloy alloys are classified as nickel-base superalloys containing significant amounts of molybdenum. The combination of nickel and molybdenum provides exceptional resistance to severe chemical attack. Other alloying...
Q6. What is the maximum allowable sulfur limit in diesel fuel_________________?
Show answer Hide answer
Answer: E. 0.01%
Modern environmental regulations mandate ultra-low sulfur content in automotive and industrial diesel fuels. Sulfur compounds in fuel produce harmful sulfur dioxide emissions and accelerate corrosive engine wear. Refinin...