Q: What are the names given to (A) constant temperature, (B) constant pressure, (C) constant volume, (D) constant internal energy, (E) constant enthalpy, and (F) constant entropy processes?
Ans.: (A) Isothermal, (B) isobaric, (C) isochoric, (D) free expression, (E) throttling and (F) adiabatic processes respectively.
Q: In a Rankine cycle if maximum steam pressure is increased keeping steam temperature and condenser pressure same, what will happen to dryness fraction of steam after expansion?
Ans.: It will decrease.
Q: State Laws of conservation of energy?
Ans.: According to the laws of conservation of energy, “energy can neither be created nor be destroyed. It can only be transformed from one form to another.”
Q: What is entropic exponent?
Ans.: It is the ratio of the specific heat of a gas at constant pressure to the specific heat at constant volume.
Q: Why entropy change for a reversible adiabatic process is zero?
Ans.: Because there is no heat transfer in this process.
Q: What are two essential conditions of perfect gas?
Ans.: It satisfies equation of state and its specific heats are constant.
Q: What is Carnot engine?
Ans.: Carnot engine is an imaginary engine which follows the Carnot cycle and provides 100% efficiency.
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Q: Enthalpy and entropy are functions of one single parameter. Which is that?
Ans.: Temperature.
Q: What is the name given to process of removing non condensable in steam and other vapor cycles?
Ans.: Deaeration process.
Q: What is the importance of the Thermodynamics in the field of Mechanical Engineering?
Ans.: All the mechanical engineering systems are studied with the help of thermodynamics. Hence it is very important for the mechanical engineers.
DJ
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