FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Students have asked these similar questions
Which of the following is the correct statement?
a.
Irreversible engines have maximum efficiency
b.
The increase in entropy is obtained from a given quantity of heat at a low temperature
c.
The entropy represents a maximum amount of work obtainable per degree drop in temperature
d.
All the reversible engines have the same efficiency
e.
All the reversible and irreversible engines have the same efficiency
f.
The change in entropy may be regarded as a measure of the rate of the availability of heat for transformation into work
g.
All engines are designed as reversible to obtain maximum efficiency
Which one of the following statements are true?
A. In an ideal fluid, entropy decreases with time.
B. For a reversible, adiabatic process in an incompressible fluid, enthalpy is conserved.
C. For a reversible, adiabatic process, in a compressible fluid, the internal energy is always conserved.
D. For a reversible, adiabatic process in an incompressible fluid, the internal energy is always conserved.
E. None of the above is true.
Explain your reasoning.
Which of the following statement(s) is(are) correct?
Group of answer choices
A. The actual work is less than the theoretical work of expansion during irreversible adiabatic process.
B. The actual work is less than the theoretical work of compression during irreversible adiabatic process.
C. N
D. The change in entropy is greater in irreversible adiabatic process compared to reversible adiabatic process.
E. No heat transfer occurs during the expansion and compression in irreversible adiabatic process.
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- A. What is the difference between an extensive thermodynamic property and an intensive thermodynamic property? B. What do you mean by thermodynamic equilibrium? Explain. D. How much work is required to expand 1 kg of air at constant pressure from an initial pressure of 300 kPa and volume of 0.01 m' to a volume of 0.05 m? Using the standard sign conventions, is this work positive or negative? What does the sign mean?arrow_forwardNeed Help going through the process on how to solve this problem. May accidentally be asking this a second time, because the first time I asked it, it didn't show as a pending problem. Steam expands adiabatically through a turbine at steady state. The entering stream is at 750 lbf/in^2, 750°F, and the exiting stream is a saturated vapor at 10 lbf/in^2. Kinetic and potential energy effects are negligible. a. How much work per lb of flow does the turbine produce, in Btu/lbm? b. If the turbine produces 3000 kW of output power, determine the mass flow rate of steam in kg/s. c. If this process were isentropic, the existing stream would no longer be a saturated vapor. Determine the final quality of steam in that case. d. Determine the isentropic turbine efficiency.arrow_forward1. An engine operates with 25% excess air using an unknown fuel (C,H,). Determine the equivalence ratio.arrow_forward
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