FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Prove that, whenever a system undergoes a cycle, p<0
(b)
T.
A fluid at 0.6 bar occupying 0.1 m° is compressed reversibly to a pressure of 11.1 bar and specific volume of 0.4 m/kg according to the law pv =c. The fluid
then expands reversibly according to the law pv = c to 2.1 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate
the value of n in the procesS.
When a system undergoes a Isochoric process (P = 5 bar), the change in internal internal is 5 kJ and temperature during the process is 15°C. Then its change in entropy would be approximately 1.736 kJ/kgK
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- The entropy of an ideal gas depends on both T and P. The function s° represents only the temperature-dependent part of entropy.arrow_forwardQ1: Select the right choice 1- An isentropic process is always (a) Irreversible and adiabatic (b) Reversible and isothermal (c) Frictionless and adiabatic (e) None of these answers (d) Frictionless and irreversible 2- C, and C, are related by (a) k = C, / C, (b) k = C, C, (c) k = C, / C, (d) C, = (C,) * (e) None of these answers 3- The relation ( p = constant p* ) holds only for those processes that are (b) Isentropic (e) None of these answers (a) Reversible poly tropic (c) Frictionless isothermal (d) Adiabatic irreversible 4- In isentropic flow the temperature (a) Cannot exceed the reservoir temperature (b) Remains constant in duct flow (c) Is independent of the Mach number only (e) Cannot drop, and then increase again downstream 5- Specific heat at constant volume, is defined by (d) Is a function of Mach number (а) kC, (b) (дигәт) , (c) (ðu/aT) , (d) (at/au) , (e) None of these answersarrow_forwardA fluid expands reversibly according to a linear law from 3.8 bar to 1.1 bar, the initial volume is 0.006 m3. The fluid is then cooled reversibly at constant pressure, and finally compressed reversibly according to a law pv = constant back to the initial conditions of 3.8 bar and 0.006 m3. Calculate the net work of the cycle if the work done during the constant pressure cooling is given by 5930 N.m. Sketch the cycle on a p-v diagramarrow_forward
- Q1: 0.09 m³ of a fluid at 0.7 bar are compressed reversibly to a pressure of 3.5 bar according to a law py"=constant. The fluid is then heated reversibly at a constant volume until the pressure is 4 bar; the specific volume is then 0.5 m³/kg. A reversible expansion according to a law pv²=constant restores the fluid to its initial state. Calculate the net work done on or by the fluid in the cycle and sketch the cycle on a p-v diagramarrow_forward2. An ideal gas undergoes a process from state 1 ( T1= 300 K, P1= 100 kPa) to state 2 ( T2= 600 K, P2 500 kPa). The specific heats of the ideal gas are : c, = 1 kJ/kg-K and c, = 0.7 kJ/kg-K. The change in specific entropy of the ideal gas from state 1 to state 2 (in kJ/kg-K) is (correct to two decimal places).arrow_forward3. A thermodynamic system operates under steady flow conditions, the fluid entering at 2 bar and leaving at 10 bar. The entry velocity is 30 m/s and exit velocity is 10 m/s. During the process 25 MJ/hr of heat from an external source is supplied and the increase in enthalpy is 5kJ/kg. The exit point is 20 m above the entry point. Determine flow work from the system if the fluid flow rate is 45 kg/min.arrow_forward
- Two reversible power cycles are arranged in series. The first cycle receives energy by heat transfer from a reservoir at temperature TH and rejects energy to a reservoir at an intermediate temperature T. The second cycle receives the energy rejected by the first cycle from the reservoir at temperature T and rejects energy to a reservoir at temperature TC lower than T. Derive an expression for the intermediate temperature T in terms of TH and TC when,a. The net works of the two power cycles are equalb. The thermal efficiencies of the two power cycles are equalarrow_forwardpls answer all the given thanksarrow_forwardAnswer 94 and 95arrow_forward
- kg 3. The working fluid in a steady flow process flows at a rate of 220 The fluid min rejects 100 - KJ passing through the system. The conditions of the fluid at the inlet and outlet are given: V1 = 320 "; P, = 6.0 bar; U1 = 2,000 ; v1= 0.36 : KJ m3 and kg kg m3 The suffix 1 indicates the kg KJ V2 = 140 4; P2 = 1.2 bar; U2 = 1,400 : ; V2= 1.3 kg condition at the inlet and 2 indicates the outlet of the system. Determine the power capacity of the system in MW.arrow_forwardT-4arrow_forwardTRUE OR FALSE 1. Heat flows from hot object to cold object and vice versa, as exhibited by heat pumps.2. It's impossible to have 100% efficient engines, however, it's possible to convert 100% of heat into useful work.3. Natural processes tend to be more ordered than disordered due to entropy.4. The efficiency e of a heat engine is defined as the ratio of the work W done by the engine to the high temperature heat input Qh.5. All heat engines give rise to thermal pollution.arrow_forward
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