FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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1. The first law of thermodynamics discussesa. Thermal equilibriumb. Energy conservationc. Direction of heat flowd. Entropy is zero at absolute zero temperature
2. A tank contains 1 kg mass gas whose density is 700 kg/m3. The pressure is increased from 1 bar to 3 bar. The approximate specific boundary work of the system isa. Cannot be find since some data is missingb. 285 kJ/kgc. 0 kJ/kgd. 0.285 kJ/kg
3. The nozzle is a device in whicha. Area decreases b. Area increasesc. Velocity decreases d. Velocity increases
4. Choose the correct statement/s with respect to entropy change during a processa. Entropy increases with increase in pressure at constant temperatureb. Entropy increases with increase in temperature at constant pressurec. Entropy can be kept constant by systematically increase both pressure and temperatured. Entropy can not be changed
5. The isentropic process is also called asa. Adiabatic processb. Irreversible adiabatic processc. Reversible adiabatic processd. Reversible…
An oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergo a reversible non flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C.
1. Determine the Change in Internal Energy.
choices: a.200.60 KJ. b.198.45 KJ. c.99.54 KJ. d.200.55 KJ
2. Determine the constant pressure-specific heat.
choices: a.0.9865 KJ/kg-°K. b.0.9175 KJ/kg-°K. c.0.8580 KJ/Kg-°K. d.0.7843 KJ/kg-°K
need complete solution, cancellation and symbol:)
Two pounds of air initially at 200°F and 50 lbf/in2 undergo two processes in series:
Process 1-2: Isothermal to P2 = 10 lbf/in2
Process 2-3: Constant pressure to T3 = -10°F
Employing the ideal gas model
a) determine the change in exergy for each process, in Btu
b) represent each process on a p-v diagram and indicate the dead state
Let To = 77°F, Po = 14.7 lbf/in2 and ignore the effects of motion and gravity.
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