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Concept explainers
1. The first law of
a. Thermal equilibrium
b. Energy conservation
c. Direction of heat flow
d. 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 is
a. Cannot be find since some data is missing
b. 285 kJ/kg
c. 0 kJ/kg
d. 0.285 kJ/kg
3. The nozzle is a device in which
a. Area decreases
b. Area increases
c. Velocity decreases
d. Velocity increases
4. Choose the correct statement/s with respect to entropy change during a process
a. Entropy increases with increase in pressure at constant temperature
b. Entropy increases with increase in temperature at constant pressure
c. Entropy can be kept constant by systematically increase both pressure and temperature
d. Entropy can not be changed
5. The isentropic process is also called as
a. Adiabatic process
b. Irreversible adiabatic process
c. Reversible adiabatic process
d. Reversible isochoric process
answer with explanation.
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- Refrigerant 134a enters a well-insulated nozzle at 200 lbf/in.2, 140°F, with a velocity of 120 ft/s and exits at 10 lbf/in.² with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T2 = x2 = i i °F %arrow_forwardOne-quarter lbmol of oxygen gas (O2) undergoes a process from p1 = 20 lbf/in2, T1 = 500oR to p2 = 150 lbf/in2. For the process W = -500 Btu and Q = -240.0 Btu. Assume the oxygen behaves as an ideal gas. Determine T2, in oR, and the change in entropy, in Btu/oR.arrow_forward12arrow_forward
- A 30-lb iron casting, initially at 1500°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb. °R, and 0.45 Btu/lb. °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. T+= 257.4978 (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. 0 = °F i Btu/°Rarrow_forwardNeed correctly..arrow_forwardShow solution please helparrow_forward
- Allarrow_forwardRefrigerant 134a enters a well-insulated nozzle at 200 lbf/in.2, 170°F, with a velocity of 120 ft/s and exits at 50 lbf/in.² with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T₂= x2 = i i °F %arrow_forwardRefrigerant 134a enters a well-insulated nozzle at 200 lbf/in.2, 140°F, with a velocity of 120 ft/s and exits at 10 lbf/in.² with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T₂ = i 29.615 x2 = 78.516 % °Farrow_forward
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