What thermodynamic cycle consists of two adiabatic and two constant-pressure processes___________________?
Show answer Hide answer
Answer: C. Joule cycle
Explanation
The Joule cycle, commonly known as the Brayton cycle, consists of two adiabatic and two constant pressure processes. This thermodynamic cycle forms the ideal theoretical basis for gas turbine engines and jet propulsion systems. Working fluid undergoes isentropic compression, isobaric heat addition, isentropic expansion, and isobaric heat rejection. Adiabatic processes involve no heat transfer, while constant pressure processes occur at isobaric conditions. Gas turbine efficiency depends directly on the pressure ratio across the compressor and turbine stages. The Joule cycle was originally developed by George Brayton for early constant pressure combustion engines.
Aviation jet engines and power plant gas turbines operate on thermodynamic principles derived from the Joule cycle. Engineers use regenerators in Joule cycle systems to recover exhaust heat and improve thermal efficiency. Thermodynamic software models these constant pressure and adiabatic states to optimize turbine performance. The Otto cycle consists of two adiabatic and two constant volume processes used in petrol engines. The Ericsson cycle utilizes isothermal and constant pressure processes with thermal regeneration. The Stirling cycle operates with two isothermal and two constant volume thermodynamic processes.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. How is the magnitude of tangential acceleration calculated____________________?
Show answer Hide answer
Answer: B. velocityvcrankradius
Tangential acceleration is calculated using velocity and crank radius relationships. Multiplying or dividing velocity and radius terms appropriately yields tangential acceleration units. Formula derivations link angular...
Q2. What is the typical thermal efficiency range of a well-maintained boiler___________________?
Show answer Hide answer
Answer: E. 90%
Well-maintained modern industrial boilers can achieve high thermal efficiencies reaching up to ninety percent. Advanced heat recovery systems capture waste heat from exhaust flue gases effectively. Minimizing radiation a...
Q3. A typewriter is composed of__________________?
Show answer Hide answer
Answer: C. mechanism
A typewriter consists of interconnected links designed to transmit motion from keys to typebars. When one link is fixed, the assembly transforms human input into precise mechanical output. An assembly of resistant bodies...
Q4. How is a closed thermodynamic system defined_________________________?
Show answer Hide answer
Answer: A. mass does not cross boundaries of the system, though energy may do so
In a closed thermodynamic system, mass does not cross boundaries of the system. However, energy in the form of heat or work may freely cross the system boundaries. This distinction separates closed systems from open syst...
Q5. An inventor claims a heat engine produces 20 h.p. while receiving 400 kcal/min of heat between 227°C and 27°C. How should this claim be evaluated__________________?
Show answer Hide answer
Answer: B. not possible
Evaluating the proposed heat engine against the Carnot limit proves the claim violates thermodynamics. Calculating maximum theoretical efficiency reveals the inventor's claim exceeds physical laws. Energy conservation an...
Q6. What is the typical overall thermal efficiency range for a standard thermal power plant___________________?
Show answer Hide answer
Answer: C. 30%
Standard thermal power plants convert chemical energy of fuel into electrical energy efficiently. Thermodynamic losses in boilers, turbines, and condensers limit overall plant efficiency. Real-world operational data conf...